BM TRADA Timber Industry Yearbook 2022

timber 2022 Industry Yearbook

TIMBER TECHNOLOGY

Topics include: visual strength grading, timber connections, timber frame construction

TECHNICAL FEATURES

Sustainability: timber and carbon

The durability of CLT

UKCA marking for fire doors

INSPIRATIONAL CASE STUDY

Ibstock Place School Refectory: a grand timber hall with an intricate lattice roof And the winner is: Wood Awards 2021

“Award winning, Ilulissat Icefjord Centre, is a unique building placed in a breathtaking environment in Greenland. Flame retardant treated oak panels with Woodsafe PRO”

“

“We can still improve - and we will”

I remain unwavering in my belief that wood will be the building material of choice in the future”

- Thomas Bengtsson, founder and CEO Woodsafe Timber Protection

Credits to: Adam Mørk

timber 2022 Industry Yearbook

TIMBER TECHNOLOGY

Topics include: visual strength grading, timber connections, timber frame construction

TECHNICAL FEATURES

Sustainability: timber and carbon

The durability of CLT

UKCA marking for fire doors

INSPIRATIONAL CASE STUDY

Ibstock Place School Refectory: a grand timber hall with an intricate lattice roof And the winner is: Wood Awards 2021

Published in 2022 by: Chiltern House, Stocking Lane

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07 Welcome: foreword

Providing timber expertise

Welcome to another edition of BM TRADA’s Timber Industry Yearbook and a fresh collection of technical timber articles.

09 News: industry updates

A year of change

Spotlight on 2021 activities and initiatives.

16 Events: Wood Awards

Celebrating communal school life

Highly commended for the Education & Public Sector Award, Ibstock Place School Refectory is a reimagined grand timber hall that offers a soothing visual and aural space for pupils.

20 Events: Wood Awards And the winners are...

A look at those who came top in the 2021 Wood Awards.

Timber technology

22 Advisory service

BM TRADA: technical timber, our experts and services

Ben Sharples gives an overview of expertise provided by the BM TRADA technical timber team.

26 Wood knowledge Timber training: who benefits?

Phil O’Leary explains how BM TRADA’s courses can help companies apply best practice principles.

29 Wood knowledge

How to become a competent visual strength grader

Nick Clifford explains what visual strength grading is and gives an overview of the specialist training available from BM TRADA.

32 Wood knowledge Specifying and sourcing timber in construction

An extract from Wood Information Sheet 2/3-10 Timbers – their properties and uses, which had a major update in 2021.

34 Engineering An introduction to timber connections

An extract from BM TRADA’s newest publication series with guidance for engineers.

37 Timber frame The importance of cavity barriers

Robin Lancashire explains the key role of cavity barriers and how they can limit the spread of fire.

41 Timber structures: sustainability

Storage solutions: timber and carbon

Toby Maclean discusses the key factors relating to the timber carbon store, both in new timber growth and in harvested wood products.

47 Timber structures: sustainability

Are timber structures good for the planet?

Will Hawkins investigates how a sustainably built environment offers carbon benefits.

ISBN: 978-1-909594-93-7

Cover image: The Welcome Building RHS Garden Bridgewater

Photo: Peter Cook

54 Timber structures: sustainability

Material matters: low-carbon timber design

Will Arnold considers how the efficient use of timber in construction can contribute to a more sustainable future.

63 Timber structures: sustainability

Affordable low-carbon timber homes: a balancing act Jae Cotterell outlines the challenges of construction budgets versus sustainability.

68 Timber structures: sustainability

Timber structures in building refurbishment

The retention, repair and retrofit of timber building structures has now become a priority to preserve the embodied carbon stored in the building fabric. James Walker describes the skills required.

77 Timber structures: off-site construction

Manufacturing a biogenic built environment

Robert Hairstans discusses the Biogenic Built Environment Framework: collaborative projects where research, innovation, commercialisation and education work in concert.

84 Timber structures: engineered timber CLT for private residential projects

Lee Murphy talks to three architects about their recent CLT projects.

93 Timber structures: engineered timber Moisture dynamics: the durability of CLT

Lewis Taylor summarises the findings from research on moisture dynamics in CLT by BM TRADA and Stora Enso.

96 Protection: preservation

Understanding how to protect timber

Kevin Underwood explores the external factors that can have a negative effect on timber and ways that timber can be protected.

105 Protection: preservation Product information in the wood protection sector

Gordon Ewbank explains how the new Code for Construction Product Information (CCPI) will help reinforce the drive for change in treated wood product information.

115 Landscape and exteriors: cladding

Avoiding common clangers

Janet Sycamore identifies issues that can affect a cladding project.

120 Landscape and exteriors: specification

Timber for use in garden and landscape construction

Paul Hensey explains how to specify timber for external use.

127 Joinery: case study

Innovative renovation

How windows and staircases can be used to transform a space, no matter the size.

132 Joinery: fire doors

UKCA marking for pedestrian doorsets with fire-resisting and smoke control characteristics

There is still significant confusion among fire door manufacturers regarding UKCA marking. Peter Barker explains the current regulatory and legislative landscape.

145 Materials: certification

Explaining UKCA marking

Making sense of the post-Brexit changes to the certification of construction products.

158 Materials: timber flooring

Sustainable wood flooring: an analysis

Peter Kaczmar discusses how to establish the environmental credentials of timber flooring products.

170 Education: architecture

Studio Bark – No Building As Usual

Addressing learning, diversity and the climate emergency through a live build.

Tabitha Binding reports.

175 BM TRADA: bookshop Publications

The best books on timber design and construction.

177 BM TRADA: directory Certified companies

BM TRADA certified companies for the supply of timber products and services.

Providing timber expertise

Welcome to another edition of BM TRADA’s Timber Industry Yearbook and a fresh collection of technical timber articles.

Following a year of upheavals related to the pandemic and the post-Brexit transition, 2021 became the best performing year in several decades for many across the timber industry. There has been an incredible demand for timber, driven partly by the need for sustainable building solutions, and the industry has worked extensively to meet it. Raw material prices soared.

Additionally, the market for garden offices, DIY projects and general home improvements flourished as remote workers spent more time in their homes. Furthermore, we have seen an uptake in the specification of timber by professionals driven to do their part to achieve net zero carbon. We are in a state of transition and we have seen this reflected first-hand in the thirst for knowledge about the practicalities of using timber, as demonstrated by callers to BM TRADA’s technical helpline.

It is against this backdrop that many of the articles included in this edition of Timber 2022 have been written, and thus reflect the ongoing developments and changes within the timber industry at this time.

Technical timber knowledge

Written by our BM TRADA technical timber team, on the topics of wood knowledge, engineering and timber frame best practice, Timber 2022 includes articles covering:

• visual strength grading (p29)

• timber properties and uses (p32)

• an introduction to timber connections (p34)

• cavity barriers in timber frame construction (p37).

We have also provided an introduction to this team and the services and training that they provide.

Sustainable construction

We continue to focus on the increasing need to build more sustainably during the climate emergency. Articles addressing these issues cover:

• how carbon is stored in timber (p41)

• how timber structures are good for the planet (p47)

• how to achieve low-carbon timber design (p54)

• examples of affordable low-carbon homes (p63)

• timber structures in building refurbishment (p68).

How we can help you

BM TRADA informs and assists those working in the timber industry through the provision of highquality independent advice. In 2022, we’re upping the game on every front.

Publications and the BM TRADA Bookshop

We remain committed to running the BM TRADA Bookshop and maintaining our publications and technical information. These publications can be bought from our bookshop at bookshop.bmtrada.com and through other well-known suppliers.

Technical helpline

BM TRADA’s technical team of experts answer thousands of your calls every year. We are delighted to announce that we are going to continue offering this service free of charge for the entirety of 2022.

We respond to everyone who calls with queries and will try to assist with straightforward advice or point you in the right direction, whether that’s to a specific publication or another service.

Webinar programme

Following on from a year experimenting with technical webinar programmes, we’re continuing to run these throughout 2022. We will be repeating two series that were incredibly popular – Structural timber engineering in early spring and Fundamentals of timber in late spring –as well as delivering new ones, which are intended to help people on learning journeys alongside their work.

We hope you enjoy Timber 2022. n

A year of change

Spotlight on 2021 activities and initiatives.

Post-Brexit legislative change

The UK Construction Products Regulation (UK CPR) – the new regulatory framework for construction products following the UK’s departure from the EU – came into effect on 1 January 2021, with recognition of the CE mark to cease in Great Britain by the end of the year.

However, the Government confirmed in August that businesses will have an extra year to start using UKCA marking, the new product safety marking in the UK. This enables CE-marked goods to continue being placed on the market in Great Britain until 1 January 2023 where businesses were due to begin using the UKCA marking by the end of 2021, including for construction products.

Technical advice

It is imperative that those involved with construction products – including manufacturers and importers – understand their new obligations. To aid this transition, BM TRADA has provided an overview of the new UKCA marking requirements in a new free technical bulletin – launched initially in February, and further updated in spring 2022 to reflect the legislative changes mentioned above. See page 145 for an extract from this bulletin >>

Llanbedr – affordable timber housing in Wales

Photo: Willams Homes

There’s

Brand-new guidance on timber and carbon is also due to be published in spring 2022 and will be available to buy from the BM TRADA Bookshop. Part of the Wood Information Sheet series, WIS 2/3-72 Carbon and timber in construction for building designers is a timely in-depth review of all the complex issues around the subject, and provides holistic guidance on whole-life carbon calculations and how to minimise carbon emissions in the built environment.

Another imminent publication is the Research Summary Crosslaminated timber and moisture, which outlines the findings of extensive research undertaken by BM TRADA in collaboration with Stora Enso. This summary includes:

• information about the performance of end-grain sealers, adhesive tapes, panel joint types, and temporary protection membranes on rates of water uptake

• the influence of solar gain and temperature on water uptake

• drying rates

• implications for designers and contractors of crosslaminated timber.

Our full programme of webinars also launched in 2021 with great success and attracted more than 3,000 sign-ups across the year. Experts from BM TRADA and Warringtonfire – including Lewis Taylor, Phil O’Leary, Peter Barker, Hugh Mansfield-Williams and Mostafa Jafarian – presented on topics such as fire performance, UKCA marking, structural timber engineering, the nature of wood and moisture in timber.

Publications in progress

Part 1 of Timber connections: a guide for engineers is an exploration of the underlying theory of connections and will be particularly helpful for engineers who find this topic challenging. Planned additions to this series include Part 2 – Further topics, Part 3 – Worked examples and Part 4 –Proprietary connectors, which will be released during 2022.

The series will assist the engineer with connection typology, design detail and the steps involved in verification by calculation. Technical illustrations, calculations and worked examples support the comprehensive textual analysis of the topics and challenges of timber connections.

There is also considerable demand for best practice information on how to design, specify and install cladding, particularly in response to evolving regulatory requirements. The long-awaited 4th edition of External timber cladding is being prepared by Dr Ivor Davies and BM TRADA’s technical consultants. This enlarged edition contains guidance on the key recommendations in BS 8605-2. It explains their background and practical application, while giving additional guidance that is not available in the BS 8605 series.

The new edition of External timber cladding, to be published in 2022, will include:

• an outline of the benefits of timber compared to other cladding materials

• discussion of each stage in the design and construction process

• expanded guidance on fire safety and structural performance

• new construction details for the main connections and junctions on a timber-clad wall

• information on the latest material options such as modified woods and surface coatings.

Home-Grown Homes

Since launching in April 2018, the Home-Grown Homes project team has been diligently investigating Wales’ potential to become a high-value forest nation. Home-Grown Homes, of which BM TRADA was a key delivery partner, concluded at the beginning of 2021 with a full report for the Welsh Government identifying which supply chain interventions may be most effective and how they might be applied, as well as a comprehensive list of outputs.

The project’s key findings and recommendations are summarised in the project report, while practical tools and guidance have also been developed for social housing developers, architects and engineers, timber frame manufacturers and wood processors, forestry managers and land owners.

Robin Lancashire, BM TRADA’s senior timber frame consultant, has been involved since the project launch and co-wrote the output Making the right choices – a guide to improving the build quality of new build timber frame social housing with fellow BM TRADA consultants Lewis Taylor, Adam Moring and Gavin Fidler.

These resources are all available for free download on the Woodknowledge Wales website. >>

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Awards

Two highlights of the UK timber industry calendar are the much-anticipated ceremonies of the Wood Awards and the TTJ Awards. Both continued with some adjustments as a result of the ongoing pandemic.

The TTJ Awards 2021 – its 25th anniversary – proceeded as a hybrid event, allowing people to tune in from across the UK. Winners on the day included timber mainstays English Woodlands Timber, Arnold Laver, Accsys Technologies and International Plywood.

The Wood Awards 2021 – see page 20 for more – saw Magdalene College Library, a ‘tour de force of architectural design and achievement’, take the coveted Gold Award to become the latest winner of winners. Other winners included The Alice Hawthorn, St John Street, The Boathouse, Built: East Pavilion, The Welcome Building RHS Garden Bridgewater, Gayles Farm 5 and the Iso-Lounge Chair.

This year, however, also saw the addition of the FSC® Furniture Awards to the UK calendar – a new extension of the awards that have been running in Italy since 2019. Organised by the Forest Stewardship Council®, the goal of the FSC® Furniture Awards is to recognise and celebrate the commitment of FSC®-certified companies in the indoor and outdoor furniture categories.

Twelve awards for indoor and outdoor furniture were given to FSC®-certified companies active in the furniture sector across Italy, the UK, Germany, Poland and Croatia.

Two UK-based companies – Community Products (UK) Ltd and Buoyant Upholstery Ltd – were on the winners’ list for environmentally friendly outdoor furniture and play equipment for toddlers, and exemplary corporate social responsibility policies respectively.

TRADA and TTF merger

TDUK is a new cross-sectoral organisation formed by the merger of the Timber Research and Development Association (TRADA) and the Timber Trade Federation (TTF) in 2021.

TRADA and TTF operated as separate brands initially but as of December 2021 the combined organisation is now known as TDUK (Timber Development UK), with a new brand identity. Many plans are in progress for the new organisation, including a sustainability committee which has to date produced a technical paper on carbon calculation. n

References

• www.bmtrada.com/certification-services/third-partycertification-non-fire/ukca-marking-for-construction-products

• woodknowledge.wales

• Books, Wood Information Sheets and Research Summaries mentioned are available to buy from bookshop.bmtrada.com

• Assessing the carbon-related impacts and benefits of timber in construction products and buildings, Technical Paper, TDUK, November 2021

Magdalene College Library.

Photo: Niall McLaughlin Architects / Nick Kane

TIMBER DEVELOPMENT UK

Timber Development UK has been formed from the merger of two of the largest and longest established organisations in the supply chain, Timber Trade Federation (TTF) and Timber Research and Development Association (TRADA).

Bringing these two associations together as one will create the largest, most comprehensive supply chain body in the UK, spanning from sawmill to specifier and all points in between.

We want to use this new organisation to capitalise on the growing interest in designing with timber and to act as an agent of change towards more sustainable, low carbon forms of construction.

We will help facilitate this by

•Enabling greater dialogue throughout the supply chain, from designers to manufacturers to suppliers, all within the same organisation;

•Developing the UK’s largest, most comprehensive online library of technical specification and design guidance;

•Providing regular training, CPD and webinars to hear from other practitioners and share best practice;

•Working with the UK university network via our University Engagement Program (UEP) to ensure the next generation of specifiers is equipped with the information and tools to confidently design with timber;

•Delivering the tools, training, guidance and auditing to ensure only correctly marked, legal and sustainable timber products are placed on the UK market;

•Developing supply-chain level market data to make accurate business decisions on purchasing and supply;

•Publicising and promoting the benefits of timber via our newsletters, magazines and digital outputs;

•Promoting best practice via competition such as The Wood Awards, the University Design Challenge and other activities;

•Facilitating and hosting networking and discussion opportunities via lectures, dinners, exhibitions and drinks evenings around the country.

Timber Development UK will be launching as a fully integrated organisation in summer 2022. In the meantime please visit www.trada.co.uk and www.ttf.co.uk to keep up to date on our activities.

Celebrating communal school life

Highly commended for the Education & Public Sector Award, Ibstock Place School Refectory is a reimagined grand timber hall that offers a soothing visual and aural space for pupils.

Maccreanor Lavington Architects has created a new school refectory with three dramatic vaulted roofs, each a diamond-grid lattice of glued laminated (glulam) timber beams rising to a glazed lantern. It stands in the grounds of Ibstock Place School in Roehampton, south-west London, and the three vaulted volumes define the primary functions of the building –dining hall, servery and kitchen.

Every day 1,200 pupils come here for lunch – the dining hall can seat up to 500 pupils at any one time – and the lofty spaces aim to help celebrate communal school life. As the architect explains: ‘To create an interior that was celebratory while warm, welcoming and comfortable to use, we naturally looked at timber, both as a structural element and as a finish. In our practice, we use timber for its low-carbon qualities, visual warmth and character; and because of the quality and programming benefits that prefabrication of timber components can offer.’

The transformation

Ibstock Place is a private co-educational school for pupils from nursery to sixth form, and occupies the house and grounds of a former 16-bedroom Edwardian mansion with additional school buildings – theatre, classrooms and new refectory – all set between mature trees in the original landscaped gardens. Running alongside the eastern garden boundary, the refectory has a backdrop of mature London plane trees, and its external materials, clay-tiled roofs and London stock brickwork walls make reference to the neighbouring buildings on the site. The gentle roof pitches descend to relatively low eaves to reduce the visual impact of the large internal volumes. A colonnade with brick piers runs along the main facade of the refectory and links it to paths leading to other parts of the school. >>

Project details

Ibstock Place School Refectory

Completion date: December 2019

Building type: Refectory

Location: Roehampton, south-west London

Architect: Maccreanor Lavington Architects

Structural engineer: engineersHRW

Main contractor: Feltham Construction Ltd

Structural timber supply and installation: Constructional Timber (Manufacturers) Ltd, Barnsley

Joinery: D Smith, Royston; AAS Projects and Design, Rickmansworth

Timber suppliers: Mosser Leimholz GmbH (glulam), Austria; X-Lam Dolomiti Srl (CLT), Italy; Havwoods UK (floor)

Timber elements: Roof structure, wall linings, staircases, handrails and balustrades, internal linings and acoustic panels, doors, windows and floors

Timber species: PEFC™-certified Austrian spruce, FSC®-certified American white oak, FSC®-certified European oak

Ibstock Place School Refectory

Photo: Jack Hobhouse

Events Wood Awards

Each roof structure has a similar hierarchy of elements: a series of primary 160mm x 520mm glulam beams with secondary 160mm x 440mm glulam beams incline in opposite directions to create the main diagrid. They rise from the steel ring beam at the eaves to a timber ring beam at the lantern or to the corner hip beams. Fixed between them are inclined 160mm x 200mm glulam beams, creating a subsidiary diamond lattice.

The team also considered the idea of using the glulam beams as a two-way spanning diagrid. As Greg Nordberg of engineersHRW explains:

‘This format reduced the stresses on individual members but created more onerous connections, meaning that equivalent sized sections would be required. Overall, the hierarchical approach was just as efficient and more economical.

‘The stiffness of the roof geometry and the truss action of the roof were considered with separate models to provide an envelope of forces for element design and examine alternative load paths for disproportionate collapse.’

Although the refectory is built on the footprint of former dining facilities, the architect has trebled the usable floor area by inserting a generous sixth form study area, mezzanine gallery and part of the servery above the kitchen, and by excavating a generous basement for stores.

The lattice structure is exposed and the diamond-shaped spaces between the inclined glulam beams are filled with oak-slatted panels that provide acoustic absorption. The glulam beams rise to projecting glazed lanterns, which fill the deep spaces below with natural light and support the natural ventilation strategy. Below the roof, the internal walls are panelled with matching oak slats; doors and floor finishes are also made from oak.

Roof design

In shape, the timber roof structures are truncated pyramids with a complex geometry; they enclose spaces of different sizes and rise at different inclinations to lanterns that are of different size but all terminate at the same height.

The corner hip beams act in compression to transfer the bulk of vertical loads from the roof to the steel ring beam. At the eaves, the first floor structures to the smaller hall and the kitchen provide restraint to the ring beam to reduce deflection under vertical loads. The in-plane action of these floors transfers lateral loads to diagonally braced bays at the corners of the building. The lanterns consist of welded steel frames that transfer horizontal loads across the openings at the top of the roof and stiffen the edges of the ring beam.

The geometry of the diamond grid lattice was fine-tuned to minimise variations in size of the oakslatted acoustic panels set between them. As a result, only four different sizes of diamondshaped panel were used throughout the project and they are of a manageable size for manual handling. The oak

A colonnade runs along the main facade of the refectory, linked by paths to other parts of the school.

Photo: Jack Hobhouse

The timber-lined bays are attractive and comfortable places to eat.

Photo: Jack Hobhouse

During assembly the glulam beams were supported by an internal loadbearing scaffold.

Photo: Constructional Timber

Events Wood Awards

slats are lined with acoustic fabric panels and incorporate concealed cabling for lighting, data and other services. They were prefabricated and fully finished off-site.

The assembly of beams at different inclinations was complex; the glulam had to be fabricated with millimetre precision and connections to it had to be designed and fabricated. The inclined 160mm x 520mm and 160mm x 440mm glulam beams are connected by concealed hangers or galvanized flitch plates depending on their load requirements. Connections between the glulam beams and the steel ring beam structure that supports them are made with galvanised steel plates, which were specially developed for the project by engineersHRW and specialist timber contractors Constructional Timber. The glulam roof structures are overlaid with a cross-laminated timber (CLT) deck that contributes to the in-plane stiffness of the inclined roof planes.

Roof installation

Once the timber-faced steel ring beam at the eaves was installed, a loadbearing scaffold was erected that mimicked the internal volumes of the roofs. The upper timber ring beams at the lanterns were fixed in position onto the scaffold together with the four corner hip beams that were dropped into place by crane and

rotated to their final positions. The bases of the main glulam beams were then craned onto angled reveals set in the eaves ring beam and positioned at the correct angle onto the roof lantern ring beam or corner hip beam. The scaffolding gave tolerance to position these elements and allowed the roof to support its own weight while the rest of the structure was installed.

Andrew King of Constructional Timber adds: ‘With restricted site access, all deliveries were arranged using only rigid vehicles, which was challenging as the corner hip beams were nearly 11m long and weighed 1.2 tonnes. For the installation sequence, it was key to fix the level of the lantern ring beams off the loadbearing scaffold supplied by the main contractor. The lantern ring beams were levelled to the correct height before the twin hip beams were craned into position. The members were all supplied fully protected and with their fire treatment applied so as to reduce site time and potential for damage.’

Timber finishes

It was important to the architect to ensure that the different timbers used – spruce glulam structure, oak timber linings and joinery, and oak engineered wood floors – would harmonise in the long term, in particular to avoid the possibility that the glulam might be affected by sunlight exposure and become a contrast to the more muted hue of the aged oak finishes. The practice worked closely with the timber coating company Renner Wood Coatings, which undertook accelerated ageing of the different finishes in its laboratory and produced a whitetinted fire-proof finish that is UV-stable.

Sustainability

The refectory has been awarded a BREEAM ‘Excellent’ rating for its long lifespan and low-carbon impact in use. Timber is the primary material for structure and finishes, and is all either PEFC™- or FSC®-certified. Passive measures include lanterns for stack ventilation and daylight, colonnades that contribute to shading and cooling, together with on-site renewables. n

Awards

Wood Awards 2021, Education & Public Sector – Highly commended

Structural Timber Awards 2021, Architect of the Year – Finalist

Structural Timber Awards 2021, Project of the Year – Winner

AJ Architecture Awards 2021, School Category – Winner

New London Awards 2021, Learning Category – Winner

Further information

To find out more and download the full case study, visit www.trada.co.uk/casestudies

Oak-slatted acoustic panels are fitted between the glulam beams.

Photo: AAS Projects & Design Ltd

And the winners are…

A look at those who came top in the 2021 Wood Awards.

3The Alice Hawthorn

North Yorkshire

This charming country pub has transformed its accommodation offering with the addition of 12 guest rooms, eight of which are made entirely of timber frame. The home-grown Douglas fir frame is complemented by larch cladding and poplar ply sarking. Winner of the Commercial and Leisure Award

4Magdalene College Library Cambridge

The new Cambridge University library has a glued laminated (glulam) and cross-laminated timber structure, and is populated with oak shelves and tables. The roof is formed from a grid of timber lanterns that bring light in but limit glare and overheating. Winner of both the Gold Award and the Education & Public Sector Award

3St John Street London

This Victorian apartment was reimagined using solid oak joinery, including bookshelves, wall panelling and pocket doors. Oak chevron parquet flooring throughout and lime-washed birch plywood in the bedrooms add to the careful calibration and crafted joinery. Winner of the Interiors Award

Photo: Niall McLaughlin Architects / Nick Kane

Photo: Hufton + Crow

Photo: Emil Eve Architects / Mariell Lind Hansen

5The Welcome Building RHS Bridgewater Manchester

This visitor centre sits on the site of the new Royal Horticultural Society garden of Worsley New Hall. The roof comprises a glulam timber diagrid supported by structural glulam ‘trees’. Timber decking extends from the building to the lake and the roof is clad in vertical larch.

Winner of the Structural Award

4The Boathouse

Devon

Yellow cedar tiles and cladding adorn the roof and exterior of this practical and beautiful family home. Inside, the upstairs floor is made from Douglas fir and the long, straight grain of the wood has been deliberately exposed on all levels to show off its beauty.

Winner of the Private Building Award

Belfast

The Belfast truss used in this pavilion’s design represents the area’s history of manufacturing ingenuity. Traditional craft skills were combined with innovative technologies to create bespoke building components that could be rapidly assembled on site.

Winner of the Small Project Award

For more information on each of the Wood Awards winners, visit www.woodawards.com

Photo: OGU Architects / Joe Laverty

Photo: Jim Stephenson 5Built: East Pavilion

Photo: Peter Cook

BM TRADA: technical timber, our experts and services

Ben Sharples gives an overview of expertise provided by the BM TRADA technical timber team.

BM TRADA helps companies that are using timber in building projects – whether at the design stage, during construction, or when retaining timber during historical building restoration.

Its technical timber team offers specialist expert consultancy, advice and training in all aspects of the timber and construction industries, providing value-adding services to construction and engineering clients, product manufacturers and insurers, as well as to the education sector. There is a wealth of knowledge within a team of qualified individuals who, between them, have dozens of years of combined experience in working with timber.

Introducing some of BM TRADA’s timber consultancy experts...

Phil O’Leary

Technical Manager, leading BM TRADA’s technical timber team.

Together with a wealth of knowledge and experience in the visual strength grading of timber, Phil specialises in:

• condition surveys, performance assessments and determining the structural strength of timber in many situations

• timber quality, performance characteristics, deterioration and preservation

• serving as an expert witness in establishing the causes of timber failures

• developing and presenting highly regarded topical and bespoke training courses on a range of timber subjects.

Phil also sits on the BSI’s Wood Preservation Committee and the Wood Protection Association’s Technical Committee. See page 26 for Phil’s article on timber fundamentals and how training is used in companies to develop wood knowledge.

Hugh Mansfield-Williams

Wood Technology Technical Manager for the assessment and certification of construction products and systems.

Hugh has particular expertise in:

• products for loadbearing timber structures

• evaluating product type testing and calculation

• routes to approval for construction products so that they can be placed on the market.

Hugh participates in standards development and other technical committees in both the UK and Europe. See page 145 for Hugh’s article on UKCA marking.

Dr Keerthi Ranasinghe

Principal Engineer for Structural Timber at BM TRADA and Warringtonfire.

Keerthi is a technical expert on structural timber, with a wide range of experience in structural investigations. He is a member of BSI committees on structural engineering, and the UK representative on European Working Groups responsible for Eurocode 5.

Keerthi is author of several specialist publications, including:

• Eurocode 5 Span Tables

• Timber connections: a guide for engineers

• TimberSizerPro and TimberConnectionsPro to Eurocode 5 software.

Additionally, he is:

• revising editor for the Manual for the Design of Timber Building Structures to Eurocode 5 (2nd ed).

• a project team member for the technical editing of the connections chapter of the second generation of Eurocode 5, due for release in 2023.

Keerthi delivers CPD training and workshops on structural timber engineering and on Eurocode 5 at both BM TRADA and the Institution of Structural Engineers UK. See page 34 for an extract from his latest publication, Timber Connections: a guide for engineers.

Robin Lancashire

Senior Timber Frame Consultant in BM TRADA’s technical timber team. Robin has a long and distinguished career in promoting best practice in timber frame construction.

Holding a BSc in Building and with more than 20 years’ experience in the industry, Robin was instrumental in developing BM TRADA’s frameCHECK service; his technical expertise has helped countless architects, main contractors, developers, housing associations, building control and warranty providers with impartial advice during design, construction and in use.

When he’s not providing professional advice, Robin:

• delivers practical training on timber frame technology

• represents BM TRADA on the Structural Timber Association’s Technical Committee

• is a regular speaker at industry conferences

• contributes to trade journals.

Robin has co-authored several important books, including Timber frame construction (5th ed), the acknowledged technical manual for the timber frame industry. See page 37 for Robin’s article on the importance of cavity barriers in timber frame construction.

Nick Clifford

Senior Technical Timber Consultant in BM TRADA’s technical timber team.

Nick has more than 20 years’ experience in providing clear, concise, high-quality advice on timber-related issues to architects, engineers, contractors, developers, conservation bodies and public clients.

A qualified visual strength grader for timber with expertise in species identification, fungal decay, insect damage and wood preservation, Nick specialises in:

• carrying out independent condition surveys and inspections, diagnosing defects and writing expert witness reports

• assessing the condition of timber structures, flooring, cladding and decking.

Nick teaches visual strength grading and speaks regularly on timber-related subjects. See page 29 for Nick’s article on visual strength grading.

Lewis Taylor

Senior Timber Frame Consultant in BM TRADA’s technical timber team.

A highly respected expert in the science, technology and regulation of timber frame building, Lewis also consults on thermal performance, thermal bridging, airtightness, low-energy design and acoustic control. Most of his professional work is carried out under BM TRADA’s frameCHECK service and he:

• leads some of the timber industry’s latest research results on timber moisture content

• conducts independent quality inspections and condition surveys, evaluates design details, and investigates defects and their remedy

• speaks at trade events and delivers CPD.

Lewis is on the Technical Committees for both the Trussed Rafter Association and Robust Details and is co-author of several books, including the technical manual Timber frame construction (5th ed). See page 93 for Lewis’s article on his recent CLT and durability work.

frameCHECK

BM TRADA’s nationwide frameCHECK service offers architects, engineers, contractors and housing associations independent thirdparty advice on the design and build quality of timber-framed buildings.

BM TRADA services

The BM TRADA technical timber team can assist with any project involving any aspect of timber. Some of the types of consultancy we are often involved with include:

• Timber condition and structural surveys

• Design detail evaluation

• Timber frame inspection and consultancy

• Timber joinery inspections

• Timber cladding and decking inspections

• Timber and insect species identification

• Timber coatings inspection, testing and consultancy

• Timber expert witness services

• Timber training

About the author

Ben Sharples Commercial Lead Timber Services, BM TRADA

Ben works closely with the technical timber team to ensure that we deliver our full potential and provide the excellence within the construction industry that we strive to achieve.

Further information

For technical advice or consultancy services, contact the BM TRADA technical timber team on +44 (0) 1494 569601 or visit www.bmtrada.com/advisory-services

Timber training: who benefits?

Timber training can help individual practitioners or a whole team of employees from the start of a building process right through to completion. BM TRADA develops and delivers courses for clients across and along the whole supply chain. These courses become a necessity for some suppliers; for example, the Visual Strength Grading course is designed to train delegates to strength grade timber, and forms an important part of the process for companies to place structural timber on the market.

Timber properties and uses

In recent years we have been more frequently asked by a broad range of users or suppliers of timber and timber products to deliver courses on timber as a material. These clients range from retailers and timber suppliers to engineers and architects, manufacturers and installers.

Often the first thing we are asked to provide is a course on a list of products and/or an end use. This can be challenging and sometimes limiting. To help with this we set up a course on Timber Properties and Uses, which provides delegates with a broad knowledge of how timber behaves and performs in any application and can be applied to most timber species and timber-based products.

Applying the principles

The following example illustrates and reinforces the importance of concepts that we are trying to convey.

A builder goes to his local timber merchant with their client, who is decidedly fussy about the quality of the timber they want to source to make bespoke wide planked flooring. A young lad named Steve shows the pair the best quality timber they have in stock and discovers during the conversation that the floorboards are going to be laid over underfloor heating.

Now Steve has been on one of our training courses and remembers an exercise with various scenarios that we use to show how to work out the expected shrinkage (and expansion) of timber. The aim of the exercise is to show how shockingly large the amount of shrinkage can be in a floor and how to reduce the risk of having large gaps developing between boards. We look at how to determine the moisture content of timber at the start of a given set of conditions (temperature and relative humidity), and work out the subsequent shrinkage after the underfloor heating has been turned on. We then show the difference between large, medium and small movement timbers, and demonstrate how to design and lay the floor to reduce and accommodate the shrinkage.

Steve remembered and knew that wide gaps between adjacent boards is a common complaint from end users. He couldn’t (and wasn’t expected to) remember any of the figures or numbers from the training exercise. However, he recalled that the moisture content at time of laying was important and that it was prudent to have narrower boards so that there were more gaps to accommodate the shrinkage. That is to say the more gaps you have, the narrower the average gap is between adjacent boards and, therefore, there is significantly less risk of unsightly or unacceptable large gaps appearing.

He managed to convince the builder and their client to select considerably narrower boards to make the bespoke flooring.

So, who gained from this advice? All three parties did. The builder’s client had a floor that behaved and functioned as they wanted and expected; the builder wasn’t called back to undertake costly repairs or be involved in a dispute; the timber merchant gained a reputation for being knowledgeable and wasn’t dragged into a potential dispute regarding the quality of the timber.

The combination of course content and an attentive attendee paid off.

Phil O’Leary explains how BM TRADA’s courses can help companies apply best practice principles.

Scots pine at Keldy forest

Learning outcomes

Understanding how and when timber shrinks and swells, the difference in the three different planes in timber, the difference between species, fibre saturation point – knowledge of all these factors, and more, can be applied to timbers in most uses, if not all.

What is fibre saturation point and what are the three planes of timber? What are two of the properties that make Western red cedar a better choice for external cladding than oak in regards to their response to changes in moisture content? Well, I’m not going to tell you today, but you can probably find three out of the four answers fairly easily by searching online.

However, do you know what else you need to know? It’s difficult to type in search terms when you don’t know what you should be researching because you are not aware what questions you should be asking and you don't know what you don't know.

Fundamentals of timber

Following on from our Timber Properties and Uses course (which takes approximately a day to deliver), we have developed an eight-part series (45 minutes each), called Fundamentals of Timber. Part of the challenge is that there is not one logical order to follow, as so many of the principles of and topics relevant to timber are interrelated. But we have devised an order that we think best addresses the key issues.

Delegates who have attended Module 1: ‘What you need to consider when using and specifying timber’ will have a good understanding of what topics to research. While this first module doesn’t go into any details or explain any of the principles, the subsequent seven modules do. This is a huge subject area and although we can’t cover everything in this course, the fundamentals are fully explained.

Other courses

BM TRADA offers specific courses on topics such as timber frame, scaffold board grading or Eurocode 5, but the principles in Fundamentals of Timber still apply and give you a good grounding and better understanding of working with timber. n

About the author

Phil O’Leary Technical Manager, Timber Consultancy BM TRADA

Further information

For more information on BM TRADA timber training courses, visit www.bmtrada.com/training

Cupping can occur if timber is not specified and designed correctly

How to become a competent visual grader

There are many benefits to employers who have a qualified grader on staff. Nick Clifford outlines what visual strength grading is and gives an overview of the specialist training available from BM TRADA.

The days when there were plentiful resources of virgin growth logs from which large, long, near-perfect structural timbers could be cut are long gone. Modern timber markets must use smaller and younger trees grown and harvested sustainably. Yields would be too low if perfect timber was always required for structural applications, so wood with naturally occurring strength-reducing features is used.

What is strength grading?

Strength grading is the evaluation of these features, either by machine or visually. BM TRADA’s Visual Strength Grading (VSG) course teaches delegates how to:

• recognise and measure strength-reducing defects

• apply the appropriate strength-grading rules

• categorise each piece based on its quality.

You might question why trained visual strength graders are needed today when machines can efficiently grade high volumes of timber for structural uses, but there are distinct advantages to both methods. Visual graders can easily switch back and forth between grades, lengths and cross-section sizes, which is an advantage where smaller volumes of timber are needed in a range of sizes and grades. Visual graders are also mobile and have the potential to travel for grading at multiple sites, whereas machine grading needs a significant initial cost outlay and the machines are usually large, immobile and better suited for high volumes of a single grade or cross-section size in a single location.

Strength-reducing features

A basic principle of visual strength grading is to evaluate the effect of wood’s naturally occurring strength-reducing features on the cross-section (width x thickness) at the worst-affected point along the length of an individual piece. Some grading rules

change based on the grade or the size of the cross-section. Other rules stay the same for all grades. Knot rules are based on their size as well as their location within the piece. A grader must be able to select the right knot or cluster to assess when there are several to choose from and apply the rules accordingly.

Grain direction is very important as it can significantly reduce strength and must be measured and deemed within (or not) the allowable slope of grain, remembering that the maximum slope limit changes for different grades. Wane, which occurs as a consequence of processing, is also frequently present because square or rectangular lengths are cut from round logs. It reduces the cross-section but it is acceptable, within limits.

Biological attack

Biological attackers reduce the strength of a piece by an indeterminate amount. Fungal decay and most wood-boring insect damage is therefore unacceptable in structural timbers and is not allowed. However, mould and sap-stain fungi are allowed, since they only affect the aesthetics and not the strength of a piece. >>

A graded section of timber should display the relevant strength class stamp

Shrinkage

Shrinkage caused by drying (either naturally over time or by kilning) sets up stresses that can cause fissures in wood, particularly in larger sizes, and also distortion such as bow, twist and spring. The depth of splits/fissures/checks/shakes, as well as the length (but not their width), influences loadbearing capacity so there are rules for allowable fissures. Checks or shakes (fissures that do not entirely pass through the whole cross-section) have limits on their length but they are unlimited if their depth is less than half the thickness of a piece. Fissures passing through the full thickness are correctly called splits, and these have much tighter limits as their influence on strength is much greater. Permissible limits for fissures vary for different grades and cross-section sizes.

Qualification and assessment

Delegates who pass a BM TRADA VSG course and exam are deemed competent strength-graders. They must join a third-party certification scheme to receive their personal grader number and stamp before they can structurally grade timber for commercial use. Certification schemes include regular audits to check grading records are maintained and up to date, and also to regularly assess individual grader performance as part of their ongoing monitoring.

Regular assessments of graders are important not just because good-quality graders often produce higher yields than poor graders, but also because grading skills can quickly become rusty without sufficient practice: incorrectly graded structural timbers potentially carry huge liabilities. BM TRADA consultants have investigated failed timbers that have caused injuries and unfortunately the occasional fatality. We have also been asked to comment when disputes arise over timber quality. One of the first things we check, or are asked, is whether or not the piece met the grade that was stamped on it.

Visual strength grading courses

The following aspects of visual strength grading are covered by BM TRADA’s specialist courses.

Terminology

Basic terms such as GS or SS, C16 and C24, D24, D30, THA, TH2 that are common for structural timber in the UK will be familiar to those who have attended a VSG grader course. A competent grader must understand the difference between strength grade and strength class. Different timber species have a wide range of properties, including their strength, so categorising the timber by quality (grading) isn’t the full picture when it comes to assigning a strength class. It’s important to know the species and source of the wood, for example whether it was imported, or grown in the UK.

A piece of timber being visually strength graded

Species recognition

The species recognition aspect of the course helps delegates to begin to separate one timber from another based on macro-features such as knot size, colour and distribution, as well as grain pattern, heartwood/sapwood boundary and rate of growth. This helps to ensure that the correct strength class is assigned and stamped on the wood after grading.

Examination and assessment

Understanding the principles of strength grading is tested through an exam. If you can identify the defects in a piece and measure them correctly, you have a great chance of passing. The courses are not memory tests and people are not expected to memorise the numerous grading rules and variations between grades – in the real world you can check the rules as you grade using the appropriate standard, so you can refer to the rules that are included in the course booklet at any time throughout the course and exam.

BM TRADA softwood VSG courses run several times each year and the hardwood VSG courses run once or twice annually. Attending a BM TRADA VSG course guarantees an improved understanding of timber. Passing the course and

the exam authorises delegates to carry out strength grading for their company, while all delegates will be better placed to talk to customers and clients with a greater knowledge of not just structural timber, but of wood generally. n

About the author

Nick Clifford Senior Timber Technical Consultant BM TRADA

Further information

To find out more about BM TRADA’s Visual Strength Grading courses, visit www.bmtrada.com/training/timber-training

Further reading

• WIS 2/3-10

Timber properties and uses, BM TRADA, 2021

• WIS 4-7 Timber strength grading and strength classes, BM TRADA, 2021

Different types of wood, such as the hardwood pictured, have different properties so it is important to know the species and the source of the wood

Specifying and sourcing timber in construction

The following is an extract from Wood Information Sheet 2/3-10 Timbers – their properties and uses, which had a major update in 2021.

Timber is a versatile material, its properties suited to a very wide range of uses both structural and non-structural. Wood Information Sheet (WIS) 2/3-10 offers an overview of the considerations a specifier should take into account when deciding whether the properties of a timber are suitable for a particular end use.

Specifying timber

While trees capture carbon dioxide from the atmosphere, store carbon as a ‘building block’ of timber and release oxygen back into the atmosphere, timber is both renewable

and recyclable. Timber has therefore gained a very welldeserved reputation for being an environmentally friendly and versatile material.

Timber is used widely in a range of applications and evidence of its versatility is all around us. It can be used for numerous external and internal purposes, ranging from structural posts, beams, joists and rafters, to nonstructural external timber cladding, fencing, windows and doors, and interior flooring. It is also used for furniture and specialist uses such as musical instruments and tool handles.

Hodges Place (Knox Bhavan Architects). Photo: Dennis Gilbert

When choosing from the range of timber species available, a specifer should establish which properties are required of the timber to achieve the desired performance for a particular end use.

Sustainable sourcing

Prior to 31 December 2020 and the UK’s final departure from the EU Customs Union and the European single market, timber traded in the UK had to comply with the EU Timber Regulation (EUTR).1 Since 1 January 2021, the UK construction industry must follow the UK Government’s own Timber and Timber Products Placing on the Market Regulations (UKTR).2 While the UKTR has many of the same requirements as the EUTR, it will lead to some changes for timber suppliers. The EUTR requires that timber placed on the European market is supplied in accordance with the relevant national laws of the country of origin. It also requires evidence of supply chain traceability. Under UKTR, operators must collect and demonstrate much more detailed due diligence procedures. They are obliged to ensure there is ‘negligible risk’ of illegally harvested timber entering their supply chains, for example; your timber supplier will have dealt with this requirement.3

Chain of custody certification schemes to support the sustainable sourcing process are available, such as those operated by the Forest Stewardship Council® (FSC®) and the Programme for the Endorsement of Forest Certification (PEFC™). These third-party certification schemes verify that timber suppliers are part of an unbroken ‘chain of custody’ system, which provides proof that the timber used to process or manufacture an end product was sourced from a well-managed forest. Certification labels on the end product demonstrate compliance with schemes such as those maintained by FSC® and PEFC™.4

Some species, notably tropical hardwoods prized for their decorative features, are no longer readily available. For example, rosewood (Dalbergia nigra) is listed under Appendix I to the Convention on International Trade in Endangered Species (CITES), meaning trade is severely restricted, whereas other Dalbergia spp. may be available. For an indication of whether a species is under threat or endangered, refer to:

• Checklist of CITES Species5

• The IUCN Red List of Threatened Species.6

British-grown timber is available for a number of end uses, particularly for sawn timber, particleboard and fibreboard.7 n

Further information

The full version of this Wood Information Sheet is available to buy from bookshop.bmtrada.com

References

1. Regulation (EU) No 995/2010 of the European Parliament and of the Council of 20 October 2010 laying down the obligations of operators who place timber and timber products on the market

2. www.gov.uk/guidance/regulations-timber-and-flegt-licences

3. More information can be found at gov.uk

4. For more information, see WIS 2/3-58 Sustainable timber sourcing, BM TRADA, 2019

5. http://checklist.cites.org

6. www.iucnredlist.org

7. For more information, see WIS 2/3-67 Specifying Britishgrown timbers, BM TRADA, 2022. This WIS contains a detailed set of species data sheets for a number of Britain’s timbers including oak, ash and Douglas fir

8. For more information, see WIS 2/3-63 Modified wood products, BM TRADA, 2021

An introduction to timber connections

The following extract comes from BM TRADA’s newest publication series with guidance for engineers.

Timber has been used as a construction material for generations. From the early Japanese ‘Tateana Dwellings’ to the architecture of the Victorian era of England, the ingenious use of timber as a construction material is evident, through techniques developed independent of country or continental boundaries.

Local abundance of the material and the ease of conversion with the most basic of tools meant that solutions to some of the fundamental problems of construction seemed to have been found with relative ease in timber. The forming of a rudimentary curved notch on the underside of a round log to form a gravity fit in early cabin constructions, for example, is still used today, albeit with modern tools that allow this joint to be made more precise.

Studying the evolution of timber roofs from ancient times to the modern trussed rafter constructions, one can clearly see how our understanding of the modern ‘triangulated’ structures has been heavily influenced by the ingenuity of early timber constructions.

Understanding timber

Being a natural material with varying properties and limitations in available sizes, designing with timber warrants a specialist understanding of the product. Strength and stiffness properties of timber are dependent on the species of wood and the geographical region of growth, as well as on the humidity and the temperature of the environment to which the structure is exposed. Duration of loading also has an effect. All these should be considered when designing structures with timber.

Optimising the use of available sizes of the material makes designing connections an integral part of any timber engineering project, with anisotropy and the variability of the material adding greater complexity to the problem.

Resolving connections

Most complex timber engineering projects require the connections to be resolved first, or at least in parallel with the sizing of the members, as the member sizes are most likely to be governed by the requirements of the connections. Intensity of the loads to be transferred between timber members across a joint, and the geometry of the group of fasteners forming the connection, will determine the stress levels generated within the timber surrounding each fastener.

Royal Academy Music Recital Room. Photo: Adam Scott

Timber technology Engineering

When such stresses are managed through proper calculations and appropriate detailing, localised failures within members, which could ultimately lead to the failure of the connection and the structure as a whole, can be easily prevented.

At the most basic level, timber connections can be classified as:

• all-timber (carpentry) connections

• connections involving metal fasteners or connectors

• glued connections.

Combinations of these three types are also possible and are widely used.

Metal fasteners or connectors

Connections involving metal fasteners or connectors can be further divided into two main groups based on the mechanism of force transfer between the fastener and the timber members being connected. The first group involves dowel-type fasteners, such as nails, staples, bolts, dowels and screws, where the loads being transferred across the joint generate bending and tensile stresses in the fasteners, as well as embedment and shear stresses within the timber along the shank of the fastener. These are the most frequently used fasteners in contemporary connections.

The second group also involving metal fasteners are the surface or partial penetration fastener types such as punched metal plate fasteners, nailing plates, toothed metal plate fasteners, split and shear ring fasteners, where the load transfer is related to the surface area of the timber members and associated metalwork.

Dowel-type connections

Dowel-type connections involve the most common metallic fastener types in use, which includes nails, staples, bolts, dowels and screws. In discussing these connections, it is vital to understand the characteristics of these fasteners, their specifications and the load-carrying mechanisms involved.

Modern design methods for connections, such as the European Yield Model based calculations presented in Eurocode 5, require the designers to establish the capacity of an individual fastener in a given joint, before looking at combining them in a group to form the joint.

The sequence of steps shown in Figure 1 should be followed to calculate the capacity of dowel-type connections, for which the dimensions of the materials to be connected are assumed. Some of these dimensions may need modification later to suit the calculations, or a different connection specified if the member sizes should remain unaltered. n

Further information

Timber connections: a guide for engineers. Part 1 – Theory is available to buy from bookshop.trada.co.uk

• Part 1 – Theory aims to explain the theoretical principles of timber connections, primarily the dowel-type connections.

• Part 2 will supplement Part 1, containing advanced topics such as fire resistance, brittle failure and durability.

• Part 3 will contain worked examples highlighting some of the principles discussed in the first two parts.

• Part 4 will look at recent connection exemplars, with the focus on engineering aspects.

• Part 5 will complete the series by looking at proprietary connectors commonly available on the market.

Further reading

• Ross, P., Hislop, P., Mansfield-Williams, H., Young, A., Concise illustrated guide to timber connections, ISBN 978-1-90510-851, BM TRADA, 2012

• WIS 2/3-36 Design of structural timber connections, BM TRADA, 2017

Figure 1: Connections design flow diagram

Harmony Timber Frame UK, Unit 1b/2a, Canterbury Ind Park, Island Road, Hersden, Canterbury, Kent, CT3 4HQ

GLULAM ROOF & FLOOR CASSETTES

The importance of cavity barriers

Robin Lancashire explains the key role of cavity barriers in timber frame construction and how they can limit the spread of fire.

While the importance of cavity barriers is increasingly recognised, the construction industry still needs to concentrate on ensuring that they are installed correctly, so that in the event of a fire they can perform as intended.

Cavity barrier performance

Recent fire events in various building types have turned attention to the performance of cavity barriers and how they are installed in buildings. The cavity barrier plays a critical role in preventing fire and smoke from travelling unseen through what can be an extensive network of connected spaces in a building. Acting much like a chimney, a cavity can allow fire and smoke to travel fast and unseen, making it difficult to fight fires, causing extensive damage and risking lives. National building regulations tell us where cavity barriers should be installed, what they should be constructed of and how they should be fitted. There are some regulatory differences between the nations that make up the UK, both in terminology and specific requirements, but the principles are all the same – limit the spread of fire in a cavity.

Balancing ventilation and fire safety

When building with timber frame, it is important to accommodate the requirement for cavity barriers along with the need to provide an environment where timber elements can remain dry and below the decay threshold (a moisture content of 20% or less). Timber frame construction needs a drained and vented external wall cavity behind all types of cladding. This provides a space where moisture vapour that travels though from the warm side of the wall to the cold side can ventilate away, without forming as damaging interstitial condensation.

The external wall cavity is also a line of defence from the outside: it prevents wind-driven rain or leaks through the cladding from directly wetting the timber frame structure by letting moisture drain away freely. The challenge therefore is to provide cavity barriers where required, while allowing the timber frame structure to drain and vent.

Timber Frame Construction (5th edition) is the go-to publication for those designing and building with this increasingly popular material. The cladding chapter of the book provides detailed sections of various cladding types, along with information on how external wall cavities are closed at required locations, while still providing the necessary drainage and ventilation.

Fire resistance

It may be surprising to learn that timber is listed in the building regulations as a material that can be used to provide the necessary fire resistance of a cavity barrier. However, it is the material of choice for cavity barriers around window and door openings, and with claddings that are supported by the timber frame structure. In the event of a fire, the timber slowly chars at a predictable rate so it can provide the required period of fire resistance. It can be installed in continuous lengths, is reasonably robust during construction and fulfils other roles while acting as a cavity barrier. >>

Timber cavity barrier around a window

Timber technology Timber frame

Whether it’s a bespoke one-off design or multiples, Timber Frame Management (TFM) has sustainability and climate change at the forefront when designing and manufacturing your project.

Timber is a natural carbon store and a renewable resource which makes it an ideal and environmentally conscious building material. The offsite manufacturing process produces less waste than traditional construction meaning less material ends up in landfill. Even after transportation, timber often has a negative carbon footprint.

TFM have recently invested in a new wood fired heater so that even the small off cuts from the optimised CNC cutting process in the factory are used to warm the building.

Join forces with us on your next project and become a part of the sustainable building revolution.

• Speed of build

• Low carbon footprint

• Reduced build times

• Positive environmental impact

• Significantly reduced carbon compared with traditional build methods

Join forces with us on your next project and become a part of the sustainable building revolution.

The typically red polythene covered strips of mineral wool that adorn many timber frame buildings under construction are a common sight: these perform well as a cavity barrier if they are fitted in a continuous line and are sized to be installed under compression to fully close the cavity. Remember that in the event of a fire, the polythene sleeve quickly burns, providing no support to keep it in place. Precise sizing to ensure a compression fit of the mineral wool core is therefore critical to stop these strips falling down the cavity and failing. They can also be easily damaged or dislodged during the construction phase.

Although more expensive than timber or mineral wool, intumescent cavity barriers are gaining popularity. In the early stages of a fire and exposure to heat, they are designed to swell up, closing the cavity against further fire and smoke. In their inactive state they can contribute to good drainage and ventilation through a clear cavity. This can simplify detailing and reduce the need for what can be unsightly drainage slots.

Party walls

Cavities are not only found in external walls. The other key area where they occur is in party walls. Timber frame buildings rely on cavities to reduce acoustic transfer between areas of the same building. These cavities need closing at compartment lines to prevent fire and smoke having a direct route between them. Hard materials cannot be used as cavity barriers here as these would provide a route for acoustic transfer, so wire reinforced mineral wool or polythene sleeved mineral wool cavity barriers tend to be used in these locations. It is critical that they are fixed and sized to close the cavity and remain in place at compartment lines.

While most cavity barriers are installed at edges of cavities and along compartment lines, there are other locations where they are required by national building regulations. The relevant statutory documents should be consulted. n

BM TRADA frameCHECK

BM TRADA’s frameCHECK team specialises in providing consultancy on the design and construction of timber frame buildings. Its work assists all those involved in timber frame construction by helping to ensure that buildings can be detailed and constructed to best practice. Typical consultancy work involves evaluating drawing details and visiting sites under construction to provide specific advice. Whether you are an architect, contractor, surveyor or building owner, consider using the frameCHECK service, which has been helping raise the standards of timber frame construction for more than 25 years.

Junction of element firestopped with plasterboard linings

LET’S BUILD A DURABLE AND SUSTAINABLE FUTURE FOR GENERATIONS TO COME BY MAKING THE MOST OF EVERY TREE.

A WIDE RANGE OF TIMBER PRODUCTS: Glulam, CLT, C24, cladding, decking, fencing and landscaping timbers, UC4 15/20-year warranted timbers, wood composite cladding, decking and fencing and wood pellets.

LOCALLY SOURCED AND CERTIFIED TIMBER SPECIES: Pine, Douglas Fir, Spruce.

Storage solutions: timber and carbon

Toby Maclean discusses the key factors relating to the timber carbon store, both in new timber growth and in harvested wood products.

Alarge part of any timber product is carbon. By mass around 50% of the dry weight of most timber is carbon, so for every tonne of timber there is 0.5 tonnes of carbon locked inside, equivalent to over 1.8 tonnes of carbon dioxide (CO2) removed from the atmosphere. Of course, the converse is also true: for every tonne of timber that naturally decays or burns, 1.8 tonnes of CO2 is released.

It is therefore important to lock CO2 as carbon in new wood growth and then to keep it locked in the derived timber product for as long as possible. Carbon stores can be created in:

• Forests – through new wood growth with afforestation policies, by forestry management practices and in new forests.

• The built environment – using timber as harvested wood products (HWP). Buildings can be a great long-term carbon store.

The carbon store in forests

Woody biomass (above ground), trunk and branches

15 to 20% 1

5%

Carbon stored is simply a function of tree growth. After a period of establishment, most trees exhibit a period over decades of relatively fast growth followed by declining growth rates as they mature Woody biomass (below ground), roots

Litter (on the forest floor) 5%

Soil (top 1m) 70% to 75%

Carbon store added to on an annual basis and also releases some carbon as parts of the store decay

Carbon capture rate can be similar to that in the woody biomass and can also be at risk of release if the soil is disturbed

UK forests that cover only 13%2 of the UK land area compared to an EU average of 38%3 nevertheless absorbed around 18 Mt carbon dioxide equivalent (CO2e) per year4 in 2017, which is around 2.6% of the UK’s carbon footprint (measured on a consumption basis) of 700 Mt CO2 e per year as of 2018.5 By contrast, the forests in the EU28 (the 28 member countries of the EU before the UK left) as a whole in the years 2010 to 2020 absorbed an average of 440 Mt CO2 e each year, which is around 10% of the EU carbon footprint.6

Other important forest functions aside, such as conserving the soil carbon and biodiversity, increasing forest cover in the UK would provide a useful increase in atmospheric CO2 removals. Once established, in commercial forestry especially, it is important to harvest (and replant) the mature trees regularly to maintain carbon sequestration rates >>

Timber in a house in Lavenham, Suffolk, dating from as early as the 14th Century.

Photo: Toby Maclean

Note: NAI = net annual increment in m³ and so directly comparable to carbon increases in the above ground biomass. The NAI of an unharvested commercial forest falls to almost zero after 150 years or so but the higher the proportion of harvesting then the higher the NAI remains.

The carbon store in harvested wood products

The carbon store in HWPs is best conserved and grown by increasing:

• the amount of sustainably grown timber8 entering the HWP store

• longevity of HWPs

• reusing the HWP at the end of life in as close to its original form as possible (with minimum processing and degrading of the timber).

The maximum size of the carbon store in HWPs that can be created is linearly proportional to the amount of timber that enters the store and the lifetime of the products before the carbon within them is released. If the amount of timber entering the store is doubled, the carbon store doubles. If the average longevity of those products is doubled, the carbon store doubles in size too.

The annual volume of timber felling in the EU28 in 2015 was around 430 Mm3,9 which represents approximately 315Mt CO2 absorbed from the atmosphere during growth, based on a common timber density and moisture content. For every ten years the lifetime of those products can be extended, this would represent an additional 3,150 Mt CO2 to the HWP carbon store – which is similar to the annual production CO2 emissions of the same EU28 area.

Carbon release is not inevitable at the end of a product’s life, and everything should be done to ensure that as little carbon as possible is emitted as the product moves on to its next life.

The various uses of timber can be thought of as a cascade down the possible applications, with long-life, unprocessed uses at the top and progressively shorter life or more highly processed uses further down. This cascade concept implies that as much timber as possible is used in its first life in solid timber products and then re-used in the same form for as long and as many times as possible. When it can no longer be used in the same form, then it can be processed into a product one level down the cascade, such as a particleboard, and so on until eventually it reaches the base of the cascade as fuel.

Summary

The carbon store that can be grown in the built environment. Source: Based on work by Allt Environmental Ltd

Commercial forestry will not always provide the optimum carbon sequestration policy for an area of land, although research suggests that sustainable commercial forestry, harvested regularly, can bring substantially more carbon benefit than the equivalent area planted as conservation forests.10 There are many competing and valid demands of forestry including biodiversity, socio-economic and amenity factors. However, the combination of commercial forestry and the built environment is unique in providing the opportunity to both sequester carbon from the atmosphere while also constructing buildings. >>

Effect of harvesting on the NAI of forests

SUPPORTING YOUR JOURNEY TO NET ZERO

About the author

Toby Maclean

Environmental Structural Engineers

Further information

To find out more about timber and sustainability, please visit www.trada.co.uk/sustainability

Further reading

WIS 2/3-72 Carbon and timber in construction for building designers, BM TRADA, 2022

References

1 All figures for carbon stores in forests in the UK from: www.forestresearch.gov.uk/tools-and-resources/statistics/ forestry-statistics/forestry-statistics-2016-introduction/ uk-forests-and-climate-change/forest-carbon-stock/

[accessed 13 September 2021]

Note: the report State of Europe’s Forests 2020 gives the carbon stores for Europe as: above-ground biomass 29%, below-ground biomass 7%, litter 8% and soil 54% – see Fig 1.4.1 https://foresteurope.org/wp-content/uploads/2016/08/ SoEF_2020.pdf [accessed 13 September 2021]

Timber structures

Sustainability

2 Reid et al., State of the UK's Woods and Trees 2021, Woodland Trust, 2021

3 FOREST EUROPE, 2020: State of Europe’s Forests 2020

4 www.ons.gov.uk/economy/environmentalaccounts/bulletins/ woodlandnaturalcapitalaccountsuk/ecosystemservicesf orenglandscotlandwalesandnorthernireland2020#wood land-natural-capital-accounts-ecosystem-services-data [accessed 13 September 2021]

5 https://assets.publishing.service.gov.uk/government/ uploads/system/uploads/attachment_data/file/979588/ Defra_UK_carbon_footprint_accessible_rev2_final.pdf [accessed 13 September 2021]

6 FOREST EUROPE, State of Europe’s Forests 2020

7. Morison, J., Matthews, R., Miller, G., Perks, M., Randle, T., Vanguelova, E., White, M. and Yamulki, S., Understanding the carbon and greenhouse gas balance of forests in Britain, ISBN 978-0-85538-855-3, Forestry Commission Research Report, Forestry Commission, Edinburgh, i–vi + pp1–149, 2012

8. All timber, without exception, should be from FSC ® or PEFCTM certified sources

9. FOREST EUROPE, State of Europe’s Forests 2020

10. Commercial afforestation can deliver effective climate change mitigation under multiple decarbonisation pathways, see doi.org/10.1038/s41467-021-24084-x [accessed 20 September 2021]

11. Jungmeier, G., Werner, F., Jarnehammar, A. et al., ‘Allocation in LCA of wood-based products experiences of cost action E9 part i. methodology’, Int J LCA 7, 290–294 (2002): https://doi.org/10.1007/BF02978890

Allt

The cascade concept. Source: After Jungmeier et al [11]

Hundegger K2 Industry CNC

Are timber structures good for the planet?

Will Hawkins investigates how a sustainably built environment offers carbon benefits.

The prospect of long-lived timber products, such as building structures, creating an anthropogenic carbon sink and thereby acting in opposition to climate change is a tantalising and exciting one for structural engineers. As well as being described in scientific literature,1 this idea is gaining attention in mainstream media2 as the public appetite for positive climate solutions understandably grows.

The equivalent mass of carbon dioxide stored within timber is greater than that of the timber itself, at around 1.64 kgCO2/ kg. Timber has been considered a carbon-negative material on projects, with designers claiming that biomaterials, used in sufficient quantities, can ‘more than compensate’3 for emissions used in concrete foundations and steel connections, creating structures with negative embodied carbon. Is it true that increased material consumption can lower emissions? Is this a sustainable design approach?

Understanding carbon

In discussing embodied carbon, a distinction is made between fossil carbon, emitted through combustion of fossil fuels, and biogenic carbon, which is sequestered via photosynthesis, stored in biological matter such as timber, and typically re-released through combustion or decomposition at end of life as part of a cycle.

Fossil carbon

For most timber produced today, significant quantities of fossil carbon are released through growing, planting and protection of seedlings, construction and maintenance of access roads, thinning, harvesting, debarking, limbing, sawing and kiln-drying (if gas-fired), as well as the production of surface treatments, adhesives and any post-processing into engineered products. These emissions occur at the beginning of a building’s life cycle, creating an immediate and longlasting warming effect.

Transport distances to factories and then to site can also be large, as can the quantity of timber wasted through offcuts. Despite this, studies show that timber building structures have a lower embodied fossil carbon than concrete and

steel equivalents.4 This gap is likely to increase in future, since most timber production processes can be electrified relatively simply, leading to reduced emissions with grid decarbonisation, whereas the production of cement and steel typically features hard-to-avoid emissions from chemical reactions and the high temperatures that drive them.

Biogenic carbon

Biogenic carbon is removed from the atmosphere as trees grow and can be stored within timber structures. The longer this remains locked away, the greater the potential climate benefits. If a building gets demolished, the fate of its biogenic carbon depends on the waste disposal method and cannot be predicted with certainty.

In the UK, the majority of waste timber is currently burnt as biofuel to generate electricity,5 offsetting grid production. The remainder is largely downcycled into chipboard, animal bedding, MDF or compost, most of which are short-lived products likely to re-enter the waste stream or decompose quickly. Less than 1% of the UK’s waste timber goes to landfill. Based on these statistics, it is currently reasonable to assume that most of a timber structure’s biogenic carbon re-enters the atmosphere shortly after demolition. We might reasonably hope and expect that this may not be the case in future, perhaps due to a reduction in demolition rates, new expertise in component re-use or even new technologies for bioenergy with carbon capture and storage. However, today’s codes of practice for life cycle carbon assessment stipulate that end-oflife assumptions must be based on today’s norms.

Climate benefits

Even when temporary, the storage of biogenic carbon in longlived structures has climate benefits. Although harvesting a tree stops its growth, it enables the re-planting of new saplings which, once they reach their vigorous growth phase, sequester carbon more rapidly than mature trees. If this is combined with the steady accumulation of biogenic carbon in timber products, then the total quantity can, in theory, exceed that of a mature forest (Figure 1). This highlights the benefit of locking timber away in structures compared to alternative use as biofuel or in short-lived products. The longer the structure remains in use, the better. >>

TRUSSES, GABLE PANELS

METAL WEB POSI-JOISTS

ROOF PANEL SYSTEMS

FEATURE TRUSSES

SIPS PANELS, SPANDREL PANELS

TIMBER FRAME, I-JOIST

ROOFING & FLOORING METALWORK

FLOOR CASSETTES

ATTIC TRUSS ROOM IN THE ROOF

CHIPBOARD DECKING

Despite the potential benefits of biogenic carbon storage, the most recent 2019 version of the European Standard EN 15804,7 which covers Environmental Product Declarations (EPDs), does not enable these to be fully captured.8 It takes a product system approach, where any biogenic carbon entering must also leave at end of life, specifically forbidding permanent biogenic carbon storage. However, there are several options available to designers wishing to communicate the benefits of biogenic carbon storage:

1. Report biogenic carbon separately, acknowledging its temporary nature.

2. Show the life cycle embodied carbon of a project graphically, highlighting the timing of fossil and biogenic carbon fluxes.

3. For a more detailed analysis, any carbon emission history can be converted directly to climate impacts including absolute temperature change using dynamic life cycle assessment (DLCA).9

The latter two options require an assumption to be made about the timing of biogenic carbon sequestration. As well as the ‘instantaneous’ approach adopted by EN 15804, which models biogenic uptake with production, alternative ‘backwardslooking’ and ‘forwards-looking’ approaches are sometimes considered, particularly when using DLCA. The former accounts for past sequestration from harvested trees, whereas the latter starts at zero and synchronises sequestration with those replanted, thereby capturing the importance of replanting and the benefits of using faster-growing species.9

Other factors

Much of the discussion and analysis of timber structures is focused, understandably, around carbon and climate.

However, biodiversity loss driven by pollution and habitat destruction is an equally urgent crisis. Across the EU, forest areas have increased by 9% since 1990,10 although one-third of the total are single species. Compared to multi-species forests, these monocultures are worse for biodiversity, soil health, recreational value and resistance to disturbance (and carbon loss) from pests, fire and wind.11 While biodiversity is considered a key element of sustainable forestry, evidence suggests that there is an inverse relationship between biomass production and biodiversity conservation,12 although of course steel and concrete also require land to produce and thus negatively impact biodiversity.

Another common question surrounding increased uptake of timber is supply. Across EU forests, 73% of the annual increment is currently harvested,9 total stored carbon is increasing and there is some scope for additional removals. However, demand for forest products is set to increase dramatically in the coming decades, driven by rising demand for low-carbon materials and biofuel for transport, heating and electricity.

One study13 estimates that timber demand will outstrip supply by 40% to 100% in the EU by 2050, based on current decarbonisation plans. At a global scale, the World Bank predicts a quadrupling of demand for roundwood by 2050. Ideally, long-lived products should be prioritised, re-used and then recycled progressively with energy only as a final option; however coming decades will likely see increased competition for timber across all users. The UK is already seeing record timber prices, due in part to supply and import constraints, but also to demand being at an ‘all-time high’.14 Meanwhile, concrete prices have remained steady (Figure 2); lean design will be increasingly important if timber structures are to remain cost competitive. >>

Figure 1: Biogenic carbon storage example for a UK stand of sitka spruce with 50-year rotation period, plus accumulation in forest products, compared to a similar unmanaged forest6

Figure 2: Most structural timber used in the UK is imported. The price of timber imports to the UK have more than doubled since 2015, while that of concrete has remained flat.15

Conclusion

Although many of the issues surrounding timber, the climate and biodiversity are nuanced and hotly debated, several key principles for sustainable design and specification can be concluded:

• Design with timber in mind – Timber frequently has a lower embodied fossil carbon than alternatives, regardless of biogenic carbon storage.

• Know your material – Sustainable certification (e.g. FSC® , PEFCTM) is a minimum requirement, but practices can still vary considerably. It’s best to trace and investigate supply chains, forestry practices, rotation periods and transportation distances wherever possible.

• Delay re-release of biogenic carbon – This can be achieved by designing for durability and component re-use, diverting low-value fuelwood into structures, or reusing timber destined for recycling, incineration or landfill.

• Design lean – Efficient material use remains the most sustainable approach to timber structures, minimising fossil emissions, costs and pressure on land and biodiversity while ensuring that more projects can make use of timber: a valuable, sustainable, yet finite resource. n

the author

Will Hawkins Lecturer in Structural Engineering Design University of Bath

Further reading

To find out more about timber and sustainability, visit www.trada.co.uk/sustainability

References

1. Churkina, G., et al., ‘Buildings as a global carbon sink’, Vol 3, Nature Sustainability, 2020, pp269–276 (www.nature.com/articles/ s41893-019-0462-4)

2. Smedley, T., ‘Could wooden buildings be a solution to climate change?’, BBC, 2019 (www.bbc.com/future/article/20190717climate-change-wooden-architecture-concrete-global-warming)

3. Fairs, M., ‘Serpentine Pavilion’s use of biomaterials “more than compensates” for concrete emissions, says Aecom’, dezeen, 2021 (www.dezeen.com/2021/06/16/carbon-emissions-serpentinepavilion-biomaterials-concrete-aecom)

FSC-A000503 / PEFC/16-44-002

4. Hart, J., D’Amico, B. and Pomponi, F., ‘Whole-life embodied carbon in multistory buildings: Steel, concrete and timber structures’, Vol 25, Issue 2, Journal of Industrial Ecology, 2021, pp403–418 (https://onlinelibrary.wiley.com/doi/10.1111/jiec.13139?af=R); Skullestad, J. L., Bohne, R. A., Lohne, J., ‘High-rise Timber Buildings as a Climate Change Mitigation Measure – A Comparative LCA of Structural System Alternatives’, Vol 96, Energy Procedia, September 2016, pp112–113 (www.sciencedirect.com/ science/article/pii/S1876610216307512?via%3Dihub); Himes, A., Busby, G., ‘Wood buildings as a climate solution’, Vol 4, Developments in the Built Environment, November 2020 (www.sciencedirect.com/science/article/pii/S2666165920300260#)

5. For more information, see WIS 2/3-59 Recovering and minimising wood waste, BM TRADA, 2020

6. Adapted from Morison, J., Matthews, R., Miller, G., Perks, M., Randle, T., Vanguelova, E., White, M., and Yamulki, S., Understanding the carbon and greenhouse gas balance of forests in Britain. Research Report, Forestry Commission, UK (No.018), 2012

7. BS EN 15804:2012+A2:2019 Sustainability of construction works. Environmental product declarations. Core rules for the product category of construction products, BSI, 2021

8. Anderson, J., Assessing the carbon-related impacts and benefits of timber in construction products and buildings, Timber Development UK, Technical Paper, 2021

9. Hawkins, W., et al., ‘Embodied carbon assessment using a dynamic climate model: Case study comparison of a concrete, steel and timber building structure’, Vol 33, Structures, October 2021, pp90–98 (www.sciencedirect.com/science/article/pii/ S2352012420307323)

10. State of Europe’s Forests 2020, Forest Europe, 2020 (https:// foresteurope.org/wp-content/uploads/2016/08/SoEF_2020.pdf)

11. Felton, A., Lindbladh, M., Brunet, J. and Fritz, Ö., Forest ecology and management, 260(6), 2010, pp939–947

12. Naumov, V., et al., ‘How to reconcile wood production and biodiversity conversation? The Pan-European boreal forest history gradient as an “experiment”’, Vol 218, Journal of Environmental Management, July 2018, pp1–13 (www. sciencedirect.com/science/article/pii/S0301479718303281?casa_ token=dOXam2xFyVQAAAAA:M_dQAz5n00yiE3tEb_3qF4NVv4P 3zKDWge8VOYWj-fBzrJdm1FfBGUTt7NTg6eXucKED4Itj)

13. EU Biomass Use in a Net-Zero Economy: A course correction for EU biomass, Material Economics, 2021 (https:// materialeconomics.com/publications/eu-biomass-use)

14. Trading Post-Brexit, Timber Trade Federation, 2021 (https:// ttf.co.uk/download/trading-post-brexit-report-timber-tradefederation-member-survey-feb-2021)

15. www.gov.uk/government/statistics/building-materials-andcomponents-statistics-october-2021

About

Material matters: low-carbon timber design

Will Arnold considers how the efficient use of timber in construction can contribute to a more sustainable future.

– Brentwood Station.

Photo: Nic Lehoux

With the Intergovernmental Panel on Climate Change (IPCC) report 2021 sounding a ‘code red for humanity’, the science is now unequivocally clear: the climate is changing, it is human induced and it will get considerably worse unless drastic action is taken.1 Predictions for a 2°C warmer world indicate that by 2100 (less than 79 years from now) future generations will experience significant increases in the occurrence of climate events: heatwaves (three times as frequent), extreme rainfall (1.5 times more often) and flooding (a 12-fold increase in economic damages).2

Significant changes must be made across every aspect of our lives to prevent catastrophe. So what role does timber in construction play?

Using carbon-sensitive timber

With embodied carbon responsible for around 10% of global emissions, the choice of how we construct buildings and what they are made from has never been more important. In recent years, there has been significant progress in the development of new timber technologies, allowing for longer spans, more dramatic architecture and quicker construction.

However, if timber construction is going to be part of the solution to the climate crisis, then it must be considered properly. To be carbon-sensitive, the timber used in construction must be:

• used efficiently

• detailed to last forever

• sourced from a low-carbon supplier.

Low-carbon design

Simply switching out other construction materials for timber, without changing any other aspects of the design, can lead to gross inefficiencies. Timber has unique properties that dictate the manner in which it should be used – and if it is to be used efficiently, the design process must reflect the qualities of the timber products chosen for the particular application.

Structural designers must remember that the optimal form for a timber building has direct load paths with minimal >>

“One of the unique properties of biogenic materials, such as timber, is that their growth causes carbon to be sequestered from the atmosphere and locked away within the material. This is a favourable factor that helps to combat climate change.”

structural heroics and complexities. Transfer structures (e.g. due to changes in column spacings) add significant material to a scheme – and sub-optimal structural arrangements (e.g. due to complex architectural geometry) add more material still. This is all material that could be omitted by opting for a simpler, continuous design, which would be quicker and cheaper to build.

Loadbearing walls or columns spaced similarly to domestic construction is usually optimal; with 4m to 6m spans suiting most circumstances. Longer spans are possible, but deflection and vibration start to govern the design, quickly adding material at an exponential rate. In an open-plan office, having a column every 6m might seem closer than we are used to – but materiality matters, and many would argue that it is preferable to sit close to a natural material, rather than far away from one that is artificially made.

Circular economy

One of the unique properties of biogenic materials, such as timber, is that their growth causes carbon to be sequestered from the atmosphere and locked away within the material. This is a favourable factor that helps to combat climate change, and reforestation is on the agenda for most major world economies as part of their sustainability commitments.

However, we must not view sequestration in isolation – it is part of a carbon cycle, whereby carbon leaves the atmosphere (through sequestration into a tree) and later re-enters it (when the tree dies and rots, or is felled and burnt).

Similarly, this sequestration doesn’t mean that a timber structure absorbs carbon from the atmosphere. Instead,

a timber structure locks away sequestered carbon for a prolonged period, until the decision is made to dismantle the structure and, for example, downcycle the timber into a more short-lived product (for example, chipboard or animal bedding) or burn it for fuel.

From an environmental perspective, the challenge is to lock that carbon away for as long as possible, meaning that good detailing to guard against water, rot and fire is important. Planning for a circular economy is essential, enabling the timber elements to be reused in several more structures in the future – though we mustn’t forget that the potential to save carbon in the future has to be balanced against the certainty of today’s emissions. Taking the decision to increase circularity at the expense of today’s emissions is a gamble and requires delicate consideration.

Timber sourcing

Finally, once a structure has been efficiently configured and detailed with the future in mind, one step remains – sourcing it.

It goes without saying that all timber used on every project should be FSC® or PEFCTM certified (so that felled trees are replaced with new saplings) – but how do carbon emissions feature in sourcing? >>

Timber structures Sustainability

Millennium Line – Gilmore Station. Photo: Nic Lehoux

Millennium Line – Gilmore Station. Photo: Nic Lehoux

a nail-plated timber frame revolution...

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Remember, producing a timber product is not carbon-negative. While the timber has carbon locked away within it from decades of sequestration in the past, the actual process of felling trees, turning logs into timber products and then into structural frames will always require energy. The priority therefore is to find the lowest-carbon means to turn trees into structural frames, and there is a large variation in the emissions produced by different manufacturers of the same material.

For a timber project to minimise its emissions, it needs to prioritise those manufacturers working on technological developments to reduce production emissions. Many are looking at burning biomass as a way to minimise emissions, but even burning waste wood releases emissions,3 and so the challenge is to find ways to produce timber structures without burning anything at all, instead using renewable-powered energy to dry and process the wood.

Looking ahead

If designed well, detailed carefully and specified thoughtfully, timber structures can play a significant role in reducing the construction industry’s emissions. This requires the whole team – from client to contractor – to work together to prioritise sustainability. The industry has never been better equipped to start tackling emissions and it has never been more important than it is now. n

About the author

Will Arnold

Head of Climate Action

The Institution of Structural Engineers (IStructE)

Further reading

To find out more about timber and sustainability, please visit www.trada.co.uk/sustainability

• FSC® website fsc.org

• PEFCTM website www.pefc.org

Further reading

• WIS 2/3-59 Recovering and minimising waste wood, BM TRADA, 2020

• WIS 4-28 Durability by design, BM TRADA, 2019

• WIS 4-33 Life Cycle Assessment, BM TRADA, 2020

References

1. Climate Change 2021: The Physical Science Basis, Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, IPCC, Cambridge University Press, 2021

2. Figures taken from sources referenced at www.carbonbrief. org/analysis-when-might-the-world-exceed-1-5c-and-2c-ofglobal-warming

3. www.chathamhouse.org/2017/02/woody-biomass-powerand-heat

Timber structures Sustainability

Samuel Brighouse Elementary. Photo: SP

Slave Lake Boreal Centre. Photo: Robert Lemermeyer

As a proud partner of Beyond Zero Homes, Robertson precision-engineered and erected the zero-carbon, timberframed COP26 House.

Robertson Timber Engineering

Our in-house team designs, manufactures and erects precisionengineered timber, and has a portfolio that speaks for itself.

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COP26 House - image by Fourfifteen

UHI Student Accommodation

Affordable low-carbon timber homes: a balancing act

Jae Cotterell outlines the challenges of construction budgets versus sustainability.

Many think that a sustainable, climate-ready future requires new housing to be built using timber, wherever feasible. This reflects a significant shift from the belief that energy efficiency alone would be required, and we are beginning to appreciate that embodied carbon is also critical to reduce carbon emissions sufficiently.

The UK building culture has been rooted in masonry construction and in recent decades there have been modest increases, across all sections of construction, in the amount

of insulation used, generally using high embodied carbon insulation. The necessary shift of emphasis towards timber structures reflects its low-carbon and renewable credentials. Building in timber frame also enables use of modern methods of construction (MMC), which assist with erection speed, quality control systems and waste management.

With the need for highly insulated and airtight homes, timber can offer carefully targeted solutions, instead of simply tweaking traditional construction methods. The potential benefits to the environment are significant. However, there are caveats and pitfalls to be avoided, or at least carefully considered. Here are three examples where specifying timber and claiming eco-credentials must be carefully balanced against environmental impacts and the potential for elevated costs.

Protecting limited resources

First, there is the over-use of timber itself – it is after all a limited resource, and we suffer from a lack of biodiverse forests both worldwide and in the UK. Planting for use as a ‘product’ is not the same as enlarging existing established woodland, and we need to keep this in mind. Allocating large areas of land for single growth ‘tree farms’ reduces land available for biodiversity and other activities such as supporting generation of renewable energy and increased local food production – land is under great pressure in the context of building a decarbonised economy.

When specifying timber, we must consider resource efficiency and newer timber products; using laminated veneers such as I-joists can be a good fit for smallscale developments as they enable minimisation of structure and maximisation of insulation.

Claims of carbon offsetting through sequestration in the timber elements can be misleading and could simply reflect extravagant use of the timber itself. Certainly, if we are looking at affordable housing and switching to timber frame construction, appropriate >>

Figure 1: Small section I-joists using laminated veneers. Photo: Passivhaus Homes Ltd

use of timber is key to minimising both the environmental impact as well as cost. The amount of timber structure required to meet an efficient wall or roof build can vary significantly, easily doubling the amount of timber required (e.g. a 360mm I-joist frame versus a 90mm cross-laminated timber panel). Even within a frame type (e.g. structural insulated panels, I-joists or solid timber studs) the timber frame fraction¹ (TTF) can vary significantly. If you want to maximise thermal efficiency (and therefore cost), you must also keep these timber fractions low, certainly aiming for <15%. A useful analysis of the TFF and its impact is referenced under ‘Further reading’. If you design or specify a frame with a high structural ratio and/or high timber fraction, then thermal and resource efficiency, as well as cost, are likely to be impacted negatively.

Reducing operational carbon

Second, to achieve low carbon, consider the use of timber beyond the structural frame. Low carbon involves reducing operational carbon too, and to achieve low heat demands we must specify lots of insulation along with designing to remove or minimise thermal bridging.

With a structurally efficient timber frame, 85% of a wall or roof construction might be insulation (certainly at Passivhaus or net zero carbon performance levels). The carbon intensity of the insulation is therefore even more important than your structural elements – that is if your whole construction solution is to reduce carbon sufficiently to meet net zero energy targets.

Using high performance insulations within a frame will significantly increase the embodied carbon impact. To provide comparative figures:

• a loose wood fibre insulation might be as low as 12kgCO2e/m3

• a wood fibre board around 40kgCO2e/m3

• a high performance PIR insulation commonly above 130kgCO2e/m3

Of course, you only require about half the depth of a higher performance insulation, to achieve similar U-values, but it is clear to see how the embodied carbon figures will still be significantly impacted by insulation choice. Certainly, a low-carbon house involves more than specification of timber structure. The further advantage of using lower embodied carbon insulations (wood fibre would be a good low-carbon choice) is that generally these insulations are also vapour permeable and enable the natural breathable properties of timber to be maintained across the entire element (roof or wall). This allows for potential drying to external air and follows timber best practice.

External finishes

Third, the carbon intensity of the finished house will also be significantly impacted by choice of the external finish. A frame might be finished in several ways, from timber cladding all the way to full brick outer skins.

The choice of cladding materials has expanded over recent years and it is worth considering newer options on the market that are lower in carbon, are robust over the lifetime of the building and offer practical disposal options at end of life. Architects currently frequently specify timber frame while >>

Figure 2: Laminated veneer lumber. Photo: Passivhaus Homes Ltd

Learn more by visiting: www.posi-joist.co.uk

also designing with brick outer finishes – this will be a highcost and high embodied carbon option. However, brick does offer a durable and robust finish that can maintain an excellent aesthetic appeal over time.

Timber cladding is typically cheaper and much lower in carbon cost, but appearance can significantly degrade with age if it is not designed, specified, built and maintained well. Choosing to use timber cladding needs that extra level of care to ensure durability and aesthetic quality over time. There are an increasing number of modified timbers now available, along with other material cladding options – considering these materials can introduce variety in the design, be cost effective, lower the carbon intensity, and offer good maintenance and appearance characteristics.

Timber structures

Sustainability

Having reduced the embodied carbon with a timber shell, consideration of the final finishes should form part of a properly integrated specification. There is much potential for use of a wider variety of durable and recyclable finishing materials, ones that could add cost value. We don’t need to revert to brick facades. A limited use of more carbon-intense options in critical areas and in locations where they might be optimally appreciated (e.g. around entrances) could be another useful strategy.

Summary

Delivering affordable low-carbon timber houses sits at the top of the built environment agenda and taking time to consider how to approach this thoughtfully would be time well spent. Achieving environmentally appropriate solutions requires broad considerations and an understanding that simply specifying timber frame will not be good enough. n

About the author

Jae Cotterell Passivhaus Homes Ltd Co-creator of the PH15 System –winner of the Ashden Award 2020 for scaleable climate change solutions

Further information

For more information, visit www.phhomes.co.uk

To find out more about timber and sustainability, visit www.trada.co.uk/sustainability

Further reading

• Innovative timber construction, ISBN 978-1-9005-875, BM TRADA, 2012

• Low energy timber frame buildings: designing for high performance, 2nd edition, ISBN 978-1-900510-80-6, BM TRADA, 2011

• Zaccaro, F., Littlewood, J. R. and Hayles, C., ‘An Analysis of Repeating Thermal Bridges from Timber Frame Fraction in Closed Panel Timber Frame Walls: a Case Study from Wales, UK’. Email fzaccaro@cardiffmet.ac.uk for more information.

References

1. Timber frame fraction (TFF) or timber to insulation ratio.

Figure 3: Wood fibre insulation. Photo: Passivhaus Homes Ltd

The approach to timber structures in building refurbishment

The retention, repair and retrofit of timber building structures has now become a priority to preserve the embodied carbon stored in the building fabric. James Walker describes the skills required.

Velvet Mill, Lister Hills, Bradford.

Photo: Urban Splash / Joel Chester Fildes

The lowest carbon building is one that has already been built. Whether maintaining a structure or refurbishing a building, when there is timber involved, appropriate skills and expertise are required to avoid condemning structural elements because of damage, decay or insufficient strength.

The approach

There are guiding principles of conservation for the restoration and refurbishment of historic buildings,1,2 but a new set of principles are required for a net zero future where carbon release is minimised and building life is maximised:

1. Do the minimum intervention possible to achieve the client’s objectives.

2. Question and revise the client’s objectives as knowledge about the building is gained.

3. Maintain existing load paths and magnitudes where possible.

4. Reuse existing materials where possible or source new materials with the lowest environmental impact.

5. Prioritise the design solution and details likely to have the longest life.

6. Construction details should be reversible to facilitate future adaptation or deconstruction.

Timber is an excellent material choice for the vertical extension of buildings made from all major construction materials due to its high strength-to-weight ratio, which helps to minimise additional load on the foundations.

One of the drivers for building refurbishment will be the retrofit of new technologies to improve the operational energy performance of buildings. Even relatively new buildings are likely to require additional insulation (pay careful attention to the building physics) and more efficient mechanical and electrical systems (ideally in accessible zones separate from the structure). >>

“Timber is an excellent material choice for the vertical extension of buildings made from all major construction materials due to its high strength-to-weight ratio, which helps to minimise additional load on the foundations.”

Any building refurbishment project should adopt the following workflow, which may be iterative:

1. Desktop study

2. Survey

3. Appraisal

4. Design integration

5. Modify, repair and reinforce.

Survey

To assist future designers, we must record the design information of buildings, ideally within the fabric of the building itself to mitigate against the loss of electronic information.

A traditional 2D measured survey may be appropriate for simple interventions. New technology can survey a building in 3D using laser acquired point cloud measurements, supplied as a 3D CAD model (Figure 1). This allows designers to integrate the new building components with the existing building and exploit the benefits of Building Information Modelling (BIM) and Modern Methods of Construction (MMC).

A structural survey is essential to identify the existing structural members and assess their condition. A complete understanding of the building structure is unlikely without opening-up works with follow-on surveys, product/species identification, testing and/or visual grading.3 Timber is particularly susceptible to moisture-related biological attack, and areas of rot and decay should be identified and repaired as necessary.

Appraisal

The building surveyor should be familiar with the common methods of timber construction as used over the past 40 years and the myriad of timber technologies available.4 See Table 1

Structural member What to assess

Sawn softwood walls, roofs and joists

Engineered joists

The strength properties for sawn softwood timber can be conservatively assumed to be C16,5 but C24 can often be demonstrated by in-situ grading. A powerful magnet can help locate the fixings through the dry lining and determine the centres of the studs.

The bending strength and stiffness of timber I-joist and metal web joist floors can be derived based on the area of the flanges and the distance from the neutral axis. The shear strength and stiffness of I-joists can be approximated from the thickness, depth and material of the web, while for metal web joists a truss analogy can be used with strength limited by the anchorage capacity of the metal ‘web’ and stiffness is based on the slippage of the connection.

Glued laminated timber (glulam)

Glulam beams are difficult to visually grade since they may be a ‘combined’ grade where the outer laminations are a higher grade than the central laminations. Glulam columns are normally ‘homogeneous’ grade to ensure uniform buckling behaviour. For preliminary design, assuming a C24 solid section is a good starting point.

Lamimated veneer lumber (LVL)

Strength and stiffness depend on whether the veneers are all unidirectional or contain some cross-grain veneers – look at the end/edge or take a small core sample. Most LVL is manufactured from softwood, but beech LVL is darker in colour.6 For preliminary design, assuming a C27 solid section is a good starting point.

Crosslaminated timber (CLT)

Trussed rafters

Generally manufactured from C24 lamellas of different thickness and comes in a variety of different layups. A core sample, in an area of low stress, can identify the layup for analysis using the γ -method for mechanically jointed beams.7

Extremely efficient in their use of material and difficult to adapt without significant intervention. Specialist software including appropriate nail plate models is required for checking.

Racking boards

Look out for oriented strand board or other structural racking boards in walls, but remember that nonwood-based racking boards are now commonly used to satisfy fire requirements.

Figure 1: 3D CAD model under construction from laser surveyed point cloud data.

Source: James Walker

Table 1: Assessment of different timber construction methods

Where it is not possible to assess the strength of a structural member, an alternative approach is to calculate the load supported by the structural element and ensure that the new loading arrangement does not increase the internal stresses on the member. If stresses exceed the limits of the structural members, reinforcement may be required. However, Eurocode 5 and other modern design codes are primarily written for new buildings and alternative means of demonstrating suitable reliability may be appropriate for existing buildings.8

Repairs and reinforcements

Modern self-tapping timber screws and bonded plates and rods can be used to repair and reinforce existing timber elements. Design rules will be included in the next version of Eurocode 5. In the meantime, design methods can be found in academic papers9,10 and screw manufacturers’ European Technical Assessments (ETA).11 Adhesives are particularly good for repairs where the original strength and stiffness of the structural member needs to be reinstated (Figure 2 ), but glued elements should be designed to be easily deconstructed at end of life. Adhesive repairs should be carried out by a specialist contractor.

About the author

James Walker MEng MSc CEng MICE MIStructE Technical Director Milner Associates

Further information

For more information, see Timber in refurbishment, BM TRADA, 2010, available from the BM TRADA bookshop www.bmtrada. com/bookshop or visit www.trada.co.uk/sustainability

References

1. Yeomans, D., Repair of Historic Timber Structures, second edition, ICE Publishing, 2020

2. Lawrence, A., and Ross, P., Appraisal and Repair of Timber Structures, second edition, ICE Publishing, 2020

3. BS 4978:2007+A2:2017 Visual strength grading of softwood. Specification, BSI

4. Structural Timber Engineering Bulletin 2: Engineered wood products and an introduction to timber structural systems, Structural Timber Association, 2014

5. BS EN 338:2016 Structural timber. Strength classes, BSI

6. www.trada.co.uk/wood-species

7. BS EN 1995-1-1:2004+A2:2014 Eurocode 5: Design of timber structures – General. Common rules and rules for buildings, BSI

8. Macchioni, N. et al., ‘Guidelines for the on-site assessment of historic timber structures’, in International Journal of Architectural Heritage, 2013

Conclusion

Building designers need to adapt their skills to ensure existing building stock can be continually updated, refurbished and renewed in a net zero carbon landscape. Timber is the perfect material for building extensions made of any material, but to modify an existing timber requires good knowledge of standard building practices and the growing range of timber products. n

9. Dietsch, P. and Brandner, R., ‘Self-tapping screws and threaded rods as reinforcement for structural timber elements – a state-of-the-art report’, in Construction and Building Materials, 2015

10. Branco, J., Dietsch, P. and Tannert, T., Reinforcement of Timber Elements in Existing Structures, Springer, 2021

11. ETA-11/0030, Rotho Blaas Self-tapping screws and threaded rods, ETA Denmark, 2020

Figure 2: Example of an adhesive repair in the moisture-damaged tension zone of a CLT floor panel. Photo: James Walker

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Manufacturing a biogenic built environment

Robert Hairstans discusses the Biogenic Built Environment Framework: collaborative projects where research, innovation, commercialisation and education work in concert.

There are clear and compelling arguments for using naturally renewable capital to deliver the built environment. However, barriers remain in areas such as market perception, business model and procurement approaches, and a lack of understanding on such issues as durability, cost and performance in fire.

A Biogenic Built Environment Framework of collaborating partners has been set up to tackle this issue. It aims to democratise knowledge and effect change at scale, focusing on accelerating the use of wood in construction through a series of aligned research, innovation, commercialisation and educational workstreams.

Underpinning research

Research is essential. Investing in exploring and acquiring new knowledge, alongside nurturing upcoming talent and fresh thinking, is important for resolving ongoing challenges in the construction sector. Edinburgh Napier University (ENU) has an established track record in this area, working with external partners and stakeholders to implement a pipeline of PhD studentships investigating a range of topics from the serviceability of engineered flooring systems to the digital twinning of net zero carbon homes.

Creating a cohort, or a ‘doctoral training centre’, encourages mentorship and cross-fertilisation of knowledge. The ENU studentships work closely with industry and external >>

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stakeholders via leveraged funding streams; there is scope to expand this network by collaborating with other university partners and increasing the research portfolio to address technical challenges.

Wood fibre rich built environment applied research

The UK currently produces approximately 3.4 million m3 of sawn softwood per annum, 30% of which is used for construction1 – there is significant opportunity to increase this. ENU has led the research effort to enhance the use of homegrown wood fibre in the built environment (see box), this has included demonstrating through a series of projects that it is both compatible with mass timber manufacturing processes and has the structural credentials to comply with the majority of design scenarios.2

Edinburgh Napier University research projects (with the Construction Scotland Innovation Centre (CSIC) and Scottish Forestry)

• Commercialisation of homegrown mass timber – collate, analyse and summarise the research base on mass timber and explore its viability for the UK construction industry, including the determination of manufacturing of set-up scenarios and the provision of technical specifications.

• Digitisation of homegrown timber products – determine the potential for the symbiosis of renewable resource (forestry, woody bio-mass and naturally replenishable), and the high value manufacture of a resilient and sustainable built environment leveraging the potential of Industry 4.0 (digitisation).

• Homegrown demonstrator – evaluate the current design for manufacture and assembly (DfMA) approaches of house types considering supply chain interactions, logistical operations and building performance standards to enable the use of homegrown timber.

• Homegrown wood fibre insulation – to test and prototype the use of homegrown wood fibre products to determine the route to market, certifications and performance criteria.

Working with industry partners, this applied research provides the evidence base and necessary information to unlock investment. There is, however, a need to disseminate this information more broadly to overcome the scepticism of specifiers and clients within the decisionmaking process.

Transforming Timber initiative – homegrown timber in construction

The Transforming Timber project, led by Construction Scotland Innovation Centre (CSIC) with support from ENU, ECOSystems Technologies, University of Edinburgh, SNRG and BSW Group, explores the mainstream use of homegrown timber in the construction sector. It has been awarded funding to create a fully functional prototype highlighting the business case for using UK timber resources in future building projects, and showcased the first two-storey modular home manufactured from UK mass timber during COP26 (the 2021 UN Climate Change Conference of the Parties).

The project creates the UK’s first dedicated homegrown timber resource library, as well as virtual reality and digital initiatives. Importantly, it will also look at the overall commercialisation strategy for homegrown engineered timber products.

Timber Technology Engineering and Design (TED): an educational approach

ENU, the New Model Institute for Technology and Engineering (NMITE) and Timber Development UK (formed from the Timber Trade Federation and TRADA) are working with external stakeholders to enable an educational system that will provide an accredited educational approach with comprehensive training in modern methods of timber construction. Initial development work was funded by the Edinburgh & South-East Scotland City Region Deal and the Ufi VocTech Trust’s 2021 Seed Fund.

Students will gain specialist timber construction knowledge and skills for ‘better, faster and greener’ delivery, addressing the climate emergency and affordable housing crisis. Underpinned by technical knowledge and meta-skills, the course content will be grounded in immersive ‘learning by doing’ activities, stimulating critical thinking, and instilling new knowledge and skills for net zero carbon, using the alternative NMITE educational ethos and blended learning techniques.

Students will be able to draw upon the course learning content and work remotely (individually or in groups) to design for manufacture and assembly of a timber off-site product. The learning will focus on real-world scenarios and learners will develop a full understanding of timber system performance attributes (thermal, acoustic, structural, productivity) through software simulation or testing. The emphasis is to ensure an understanding of timber as a structural material, the array of product options and how to respond sustainably to a design brief. It will also create a broader understanding of building performance (acoustic, thermal, durability and fire), whole life cost, digital design, and retrofit and restoration. The blended delivery approach will ensure industry relevance and collaborative thinking. >>

SNRG Homegrown Mass Timber Volumetric Unit on display at CSIC COP26. Photo: CSIC

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Centre for Advanced Timber Technology (CATT)

The £7m CATT ‘Living Lab’ being built at NMITE is due for completion in July 2022. It will create the necessary conditions for research, innovation and industry-led education to collaborate in multi-contextual, empirical real-world environments, enabled by digital technologies. CATT’s objective is to stimulate co-operation across the industry both vertically (seed to end product) and horizontally (architecture, construction, digitalisation), together with demonstrating to a wider audience the rewards of a career in timber and partnering with Edinburgh Napier University, Timber Development UK, and other stakeholder partners and industry collaborators.

The CATT students will be hosted in a purpose-built learning space and connected to other living lab projects for an enriched curriculum and access to validated content for knowledge exchange.

Summary

To realise the full potential of timber in construction, research, innovation, commercialisation and education have to act in concert. Accessible information and a joined-up approach between academia, industry and external stakeholders is key to creating value return to the sector. This in turn will inform the industry’s necessary response to the climate crisis by enabling sustainable delivery of the built environment. n

About the author

Professor Robert Hairstans

Founding Director

Centre for Advanced Timber Technology

New Model Institute of Technology and Engineering

Head of the Centre for Offsite Construction and Innovative Structures

Edinburgh Napier University

Robert would like to thank the following contributors for their input into this article:

• Andrew Livingstone, Edinburgh Napier University

• Sam Hart, Construction Scotland Innovation Centre

• Matt Stevenson, EcoSystems

• Tabitha Binding, TRADA/TTF (Timber Development UK)

Further reading

Off-site and industrialised timber construction, 2nd edition, ISBN 978-1-909594-81-4, BM TRADA, 2019

References

1. Stagg, R., ‘Forestry Statistics 2020’, Forest Research, pp1–307, September 2020

2. Crawford, D. et al., ‘Viability of cross-laminated timber from UK resources’, Proceedings of the ICE – Construction Materials, 168(CM3), pp110–120, 2015

Timber Technology Engineering and Design Educational System. Source: Edinburgh Napier University

Timber structures Off-site construction

CLT for private residential projects

Cross-laminated timber (CLT) is an ideal solution for one-off residential projects, offering scope for design and innovation in one structural package. Lee Murphy talks to three architects about their recent CLT projects.

Lammasfield Farm.

Photo: Micah Jones

Timber structures Engineered timber

Many smaller architectural practices working predominantly in the private residential sector may not be aware that CLT is an option when they’re designing smaller scale, one-off private dwellings, extensions or garden buildings. Yet CLT is eminently suitable for these types of residential projects, resulting in beautifully designed and crafted, low embodied carbon, energy-efficient homes.

There is also a perception that building with CLT will be costly, whereas costs tend to be upfront and will generally be recouped through the speed and ease with which a building is installed and watertight once on site.

Here, three architects who worked with G-frame Structures to deliver their first CLT residential projects give advice to other architects interested in using CLT for the first time.

Lammasfield Farm

Micah Jones is an architect based in Northern Ireland who featured on Grand Designs in 2016 when he designed and built his own multi-award-winning, low-budget family home, County Down Barn, from CLT. He is currently on site with his second CLT project, Lammasfield Farm, which is due for completion in 2022.

‘The more forward planning you do with CLT the better, as this will allow you to design to the material’s full potential. The fundamental thing is to work with an established CLT contractor like G-frame; if you’ve never worked with CLT before you’d want to engage your specialist from a really early stage, even as early as conceptual level, to make sure everything is going to work.

‘We have been able to apply a lot of what we learned from our first CLT project to Lammasfield Farm as both projects have a CLT upper floor built above an existing concrete ground floor. CLT is a great solution for building above an existing structure because it is lightweight and fast, but a key consideration is airtightness at the connection between the new and existing parts of the building. Not getting this quite right on County Down Barn enabled us to learn and improve detailing for Lammasfield Farm. We also learned the value of doing a full M&E design before getting to planning stage and having it pre-machined at the factory, which makes the installation on site a lot easier. >>

“CLT is a great solution for building above an existing structure because it is lightweight and fast, but a key consideration is airtightness at the connection between the new and existing parts of the building.”

Timber structures

Engineered timber

‘CLT brings everything together in one product: in addition to providing the superstructure of a building, it opens opportunities for design, aesthetics and minimising carbon footprint. This is an important factor for clients in the residential sector who are becoming more aware and are interested in paying a little more to achieve a low impact home.’

The Gatehouse

Alessio Cuozzo is a founding partner of London-based Cuozzo Fleming Architects who are currently on site with their first CLT project, The Gatehouse – a four-bedroom, wheelchairaccessible dwelling that sits within a stretch of protected ancient woodland on Sydenham Hill, South London. It forms part of the overall redevelopment of Beltwood House, a Grade II listed Victorian villa.

‘CLT suited the nature of the design of The Gatehouse, which has a simple plan of two squares with steeply pitched roofs, and this provided us with a good opportunity to try CLT at a scale that we could control, in order to avoid any visual structure between the roof planes.

‘One of the reasons we decided to use CLT was its speed and ease of construction: our client chose to self-build The Gatehouse and CLT enabled us to take some weight off his shoulders as the superstructure was being manufactured off-site with windows and doors pre-cut and then installed by G-frame.

‘Using CLT has given us the experience to understand its capabilities and be more innovative and ambitious on the next project. My advice to any architects thinking about using CLT for the first time would be to give it a go on something small that you’re comfortable trying it on and not to worry about the material being too big and too complex for your project. Try making a card model and scale it up; it will take away some of the mystique and you’ll be pleasantly surprised how simple the process is – if you can make it in cardboard, you can effectively make it in CLT.’

Origami House

Matt Keeler of KSKa Architects also began his first CLT project by creating a traditional card model when he designed Origami House, a unique folded plate origami structure that provides a one-bedroom family annex in the rear garden of a listed house in a West London conservation area.

‘Planning constraints around height meant we needed to keep the build-up as thin as possible. We were replacing an existing, dilapidated garden building and wanted something with dynamic visual strength to complement the site locality next to a church hall building. CLT was absolutely the right choice for the folded plate form of the building, which, though small, demonstrates CLT’s structural properties to its limits.

‘We started by building a model out of cardboard and as soon as we connected the triangles together, we felt it take on the characteristic strength of an origami form. To achieve the roof form, which is made of triangular shapes, we had to look at dimensional shapes and capabilities of the CLT, but it was not that challenging for us to massage the designs to meet the constraints that the material has in terms of panel sizes. >>

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Lammasfield Farm CLT detail. Drawing: Micah Jones

Origami House. Photo: Agnese Sanvito

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‘I did a lot of research about CLT, particularly by consulting people who had used it before. We also visited a project with G-frame and that was illuminating. One of the biggest benefits of CLT is that you’re pre-determining things and sticking to the plan, so you need to understand the speed at which it goes up and you have to make sure the contractor understands this too because they must be ready with the follow-on very quickly.

‘CLT is a beautiful material to work with and the staggering thing is the level of precision and that it can be installed with such a small workforce, but it is essential to use a CLT specialist from the early stages for planning, organisation and expertise. The CLT supply chain is very streamlined.’

Summary

The resounding message from architects who have used CLT for the first time is to give it a go on something smaller, and make sure you’re working with a reputable CLT specialist from the early design stage. n

About the author

Lee Murphy Director G-frame Structures

Further information

To find out more about these projects, visit www.g-frame.co.uk

Further reading

• Cross-laminated timber: design and performance, ISBN 978-1-909594-63-0, BM TRADA, 2019

• WIS 2/3-61

Cross-laminated timber: introduction for specifiers, BM TRADA, 2019

• WIS 2/3-62

Cross-laminated timber: structural principles, BM TRADA, 2020

Timber structures Engineered timber

Origami House exterior. Photo: Agnese Sanvito

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Moisture dynamics: the durability of CLT

Lewis Taylor summarises the findings from research on moisture dynamics in CLT by BM TRADA and Stora Enso.

Over the past 15 years there has been much talk about cross-laminated timber (CLT) and how this construction material has enabled designers to create taller, longer, wider and more elaborate timber buildings than had previously been possible. CLT has also provided new and exciting opportunities for low/negative carbon and sustainable buildings.

CLT has really taken off in the past decade with projects ranging from small houses, medium-rise residential, large school and university buildings to vast commercial office spaces. As with all ‘new’ construction materials, there has been a learning curve, with the industry’s understanding of CLT’s strengths and weaknesses evolving over time. One of the most common areas of debate with CLT is durability (and by extension, moisture).

Providing timber and wood-based products remain dry, they will have an almost indefinite life expectancy – modern lightweight timber frame buildings have nearly 100 years of use in the UK, with more mainstream use extending back 60 years. In addition, a large proportion of the UK housing stock has timber pitched roofs, many of which are centuries old. As a result, we now have a good understanding of how these lightweight timber structures behave, and how to design and detail them to achieve a long service life.

Moisture content

Timber is at risk of the development of fungal decay if its moisture content exceeds 20% for an extended period of time. In a well-designed and constructed timber frame building or pitched roof, moisture content in service will be between 10% and 14% – well below the fungal decay threshold.

While CLT follows the same durability principles as lightweight timber structures, its thickness and the mass of timber used present additional considerations when exposed to moisture. Timber studs, joists and rafters have a relatively large surface area to volume ratio and so typically dry rapidly when conditions allow. CLT has a much smaller surface area to volume ratio and so drying rates can be substantially slower.

Thermal insulation

CLT external walls and roofs should always be designed as ‘warm’ construction, i.e. all thermal insulation is placed on the outside face of the wall or roof panel. By placing the CLT panels within the thermal envelope of the building, panels are in what should normally be a warm and dry environment – ideal for timber durability.

In the UK, the most common insulation material to be placed on the outside of CLT has been rigid foil-faced insulation boards (e.g. PIR/PUR/phenolic) installed to walls, flat roofs and pitched roofs. While these insulation materials have excellent thermal resistance and so provide good U-values for a given thickness, the foil facings limit the ability for the CLT panels behind to dry to the outside. Historically it was assumed that any wetting to the CLT panels (either through trapped construction moisture or cladding leaks/water ingress in service) would be able to dry through the panel to the inside of the building.

Moisture dynamics research

BM TRADA has been undertaking research work on moisture dynamics in CLT with Stora Enso, a leading global supplier of wood products including CLT. The two-part project looked at both wetting risk during construction and drying rates. This enables us to determine moisture distribution behaviour. >>

CLT drying rates can affect durability

Timber structures Engineered timber

Award winning mass timber and hybrid structures

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In the second phase of the research, the drying rates of fivelayer, 100mm-thick CLT panels were investigated; various configurations were tested, including covering the wet outer face of panels with foil to replicate panels covered with rigid foil-faced insulation boards and/or vapour control layers. This test set-up was intended to replicate typical UK construction build-ups for warm walls as well as flat and pitched roofs.

During testing of the covered panels, water in the wet outside face lamination was observed slowly passing through the thickness of the panels to the dry uncovered side, confirming the previously held assertion that panels could dry to the inside. However, with a starting moisture content of 35% in the wet outer lamination, it took almost 16 months for the moisture content to fall to 20%; with higher moisture contents and/or thicker panels, drying could potentially take years. Conversely, uncovered panels that were able to dry directly from the wet face took approximately six weeks for a similar moisture content reduction.

Long-term durability

A primary consideration to achieve long-term durability of timber structures is to provide a combination of drainage, ventilation and breathability. It is not normally an issue if timber gets wet, providing water can drain away quickly and the timber is subsequently allowed to dry. Slowing down or restricting drying though the use of high resistance insulation products and/or vapour control layers on the inner or outer faces of the panels can slow drying to an extent that the development of fungal decay may become a risk if panels are subjected to adverse conditions during construction or in service.

On the continent, CLT building systems are often paired with mineral wool or wood-fibre insulation products – these types of breathable insulation material are typically beneficial to timber building systems as they allow more rapid drying of the CLT panels if they are exposed to wetting during construction or in service. Figures 2 and 3 show example wall and pitched roof build-ups using mineral fibre insulation products – similar details can be used with wood-fibre insulation boards.

The use of these types of breathable insulation products, in conjunction with good overall design detailing and a moisture management plan for the construction phase, will have a significant positive impact on the long-term durability and robustness of CLT structures. n

About the author

Lewis Taylor Senior Timber Frame Consultant BM TRADA

Further information

Further information on this research will be published in 2022. More detailed guidance can be obtained from either BM TRADA or Stora Enso.

Further reading

• Cross-laminated timber: Design and performance, Revised reprint, ISBN 978-1-909594-63-0, BM TRADA, 2019

• WIS 2/3-61 Cross-laminated timber: introduction for specifiers, BM TRADA, 2019

• WIS 2/3-62 Cross-laminated timber: structural principles, BM TRADA, 2020

Figure 1: The drying mechanism of five-layer, 100mm-thick CLT panels with (left) and without (right) foil coverings

Figure 3: CLT pitched roof panel with mineral fibre insulation product.

Source: Stora Enso

Figure 2: CLT wall with mineral fibre insulation product. Source: Stora Enso

Timber structures

Engineered timber

Understanding how to protect timber

Kevin Underwood explores the external factors that can have a negative effect on timber and ways that timber can be protected.

External timber should be protected to offer the best service life.

Photo: George Barnsdale

Preservation

Timber is an abundant, inherently non-toxic, recyclable, biodegradable, sustainable material. However, it does not come without its natural enemies.

Timber is at risk of attack by some fungi and insects that can affect its appearance, strength and long-term performance as a construction material. Employing protective measures allows us to:

• increase its service life

• improve its characteristics

• make it more competitive against other materials.

Classifying wood

Timber is essentially composed of hollow fibres of cellulose, set in a matrix of lignin with discreet chemical extractives and moisture. This ligno-cellulosoic arrangement of components varies, creating a wide range of timber species, each with different appearances and performance characteristics.

Extractives give timber species their colour, smell and their level of natural resistance to attack by fungi and insects. Resistance to fungal or insect attack varies between species.

The inner heartwood contains extractives, but the outer sapwood, which is extractive free, is rich in starches and sugars; this limits the natural resistance of all sapwood to fungi and insects, should the conditions for attack be favourable.

BS EN 350:2016 1 gives guidance on methods for determining and classifying the durability of wood and wood-based materials against biological wooddestroying agents such as wood decay fungi. Annex B of BS EN 335:2013 2 defines five use classes that represent different service situations to which wood and wood-based products can be exposed, and indicates the biological agents relevant to each situation.

A use class is not a performance class and does not give guidance for how long wood and wood-based product will last in service. >>

“Timber systems will benefit the most from high levels of protection from precipitation, wind and direct sunshine, for example windows and doors seated under deep eaves or recessed into walls or sheltered by balconies.”

Wood shrinks to varying degrees along the three dimensional axes: very little along the grain and much more across the grain. The shrinkage in the direction of the growth rings (tangentially) is often up to double that at right angles to them (radially). As a result of this, and of irregular, interlocked or spiral grain, various forms of distortion are liable to occur as the piece of timber dries.

It is desirable that all the shrinkage and distortion has occurred before the timber is put to use and this is one reason why timber should be dried before it is used.

The table above, taken from WIS 2/3-71, 3 shows the relationship between use class and natural durability.

Moisture in timber

Wood has a cellular structure and the moisture in green, unseasoned timber is present in two forms:

• as free moisture in the cell spaces

• as bound moisture in the cell walls.

In drying, the free moisture in the cell spaces is the first to leave the wood, moving to the surfaces and evaporating. With further drying, the bound water leaves the cell walls and the wood starts to shrink and stress and distortion can develop.

The point at which the cells no longer contain free moisture is called the fibre saturation point and, from this stage of drying, if the wood fibres are free from constraint they will shrink to an extent that is roughly proportional to the loss in the bound moisture. In practice, the surface layers of any piece of timber tend to dry to the fibre saturation point before the centre and are brought into a state of tension. If the moisture gradient from the centre to the surface is too steep, splitting and checking may occur.

Fungi

Fungi can discolour timber, cause decay and reduce its strength. They are a form of plant life and require moisture, warmth, air and a suitable medium on which to grow. Unlike green plants fungi do not require light as they lack chlorophyll and are unable to build up organic matter from the carbon dioxide in the atmosphere. Fungi must have organic matter on which to live so they grow directly on living plants or on their dead remains. They cannot live on purely mineral soil.

Fungi decompose wood by secreting acids and enzymes, which, in the presence of moisture, render soluble some of the cellulose and other constituents of the wood. These are then used as nutrients by the fungus. The wood may be changed in composition and texture and lose strength before it is actually absorbed by the fungus.

The characteristic that usually determines whether timber in use remains sound or becomes decayed is its moisture content. Freshly felled green timber may contain its own weight of water and, unless this moisture is removed, decay can quickly become established. If dry timber is allowed to pick up moisture, or if it is used in contact with the soil, it again becomes susceptible to attack.

Fungi require air and respire to form carbon dioxide and water so, once an attack is established, the wood tends to get moister, accelerating the growth of the fungus.

In general, timber is susceptible to attack at any moisture content between fibre saturation point and complete saturation of the wood, which is when the cell cavities are filled with water.

Moisture content greater than 25% is required for active sapstain development, whereas surface mould growth can >>

Timber window. Photo: George Barnsdale

Table 1: Natural durability of commonly used structural timbers according to BS EN 350.

Impra Wood Protection

Impra Wood Protection is the trading name for RÜTGERS Organics GmbH which is part of the ICIG, a group of companies based in Frankfurt, Germany. Within the ICI Group there are 30 chemical and pharmaceutical companies operating worldwide, turning over circa €2bn and having approximately 6,000 employees.

The Impra Wood Protection manufactures at two locations in Europe at Mannheim in Germany and Barrow in Furness in the United Kingdom. Within the group there are also distribution companies in Germany, Finland and Poland with many more partners worldwide. We believe with our diverse manufacturing capabilities and having plants in both the UK and Germany we have a business model to suit all businesses throughout Europe and the UK.

Impra Wood Protection prides itself on a high level of research and development, which helps to keep the products and services at a high level meeting and exceeding the requirements of some of the most difficult applications within the timber industry, with products that have performed exceptionally in the past and will continue to do so well into the future. Impra Wood Protection works closely with its clients and approval authorities throughout the UK to stay ahead of the competition by providing solutions, which will keep its clients at the forefront of their markets, thus giving them many advantages over their competitors.

Impra Wood Protection has two distinctive product ranges for both Wood Treatment and Coatings.

The impra®lit range is made up of products that are suitable for either vacuum pressure impregnation, dipping and low pressure impregnation, protect against blue stain and mould with the addition of a large range of colourants. impra®lan and profilan® are a range of Wood Coatings for either industrial or professional use and are either solvent or water based depending on the application. These are available in a range of sizes and many different colours and can be applied by either dipping, flow coating or brushing.

become established at approximately 18%. Both sap-stain and fungi feed on cell contents and stored food reserves in the timber (i.e. starches and sugars), and are therefore generally confined to sapwood. If high relative humidity persists and moisture content increases, sap-stain or mould growth can thrive and cause deterioration of protective coatings in service. The wood-destroying wet-rot and dry-rot fungi can develop when the moisture content of the timber is above 20%.

The first line of defence is to keep timber moisture content below 20%. In timber used externally above ground, this can be achieved by ensuring the design of a product:

• does not include water traps

• promotes the shedding of rainwater to minimise wetting

• promotes air movement.

Timber used internally is unlikely to reach this level of moisture content unless the timber is affected by water from, for example, a leaking pipe or roof. The spores of wood-decaying fungi (such as wet-rot and dry-rot) or staining fungi (such as sap-stain, blue stain and surface mould) are so widespread that preventing contact with these spores is not possible.

A long service life for timber in an environment suitable for fungal development depends on the level of natural durability of the timber species used or the effectiveness of any preservation treatment that has been employed.

Insects

Timber can become unserviceable due to the natural activity of insects, which tunnel into and devour the timber. However, with our relatively cold climate, timber in outdoor environments in the UK is very rarely affected by insect pests; their variety and veracity are not as great as that seen in warmer parts of the world.

Where insect attack is a concern, preservative treatment with a contact insecticide provides a practical preventative measure.

Preservative treatment

Where timber is susceptible to fungal decay or insect attack, it can be treated with a wood preservative. The process of selecting both the type of preservative and its method of application takes into account:

• the natural durability and treatability of the timber species

• the level of exposure to moisture

• the desired service life

• the organisms against which the preservative is to provide protection.

Modified wood

It is possible to alter the chemical and structural properties of wood to enhance its natural durability and to reduce the amount of movement that may occur due to variations in moisture content. Changing the structure of wood and/or limiting the availability of nutrients reduces or prevents fungal development and insect attack.

Timber modification processes include:

• heat treatment

• impregnation of timber with resin

• acetylation.

These processes essentially create a new timber product with enhanced durability and dimensional stability. These relatively new technologies provide a wider choice of material for designers and architects to consider – popular for cladding, decking, windows, external doors, landscaping and structural applications.

Protection from coatings

Well-maintained brush or spray-applied paints and stains can extend the service life and use of timber in outdoor conditions. These surface coatings enhance the appearance of the wood and protect it from deterioration as a result of weathering. >>

UV and moisture levels can affect the durability of timber. Photo: AkzoNobel

Cladding is often treated with a wood preservative. Photo: AkzoNobel

By limiting the take up of moisture, protective coatings can also limit dimensional changes in the wood and protect against stain fungi and surface moulds.

While providing protection to the timber, coatings themselves are at risk and need to have properties that make them resistant to ultraviolet light and any airborne chemicals present in rainfall or dew forming on the surface. They also need to be able to accommodate any movement in the timber.

Temperature affects the rate of chemical reactions, and this is influenced by the colour of the coating, the angle of exposure and other factors such as the specific heat and mass of the coated timber and ventilation due to air movement.

Direction of exposure

Levels of solar radiation, humidity, temperature and precipitation can vary considerably and will greatly influence the performance of a coated timber system. The impact of these factors is determined by the direction of exposure.

In the UK, south- and west-facing elevations are generally more demanding for coatings, due to their longer hours of exposure to direct and stronger sunlight than east- and northfacing elevations; the risks of mould and algae growth will generally be highest on north-facing walls. The use of darker coatings, which absorb more solar radiation, and become hotter, can exacerbate this effect.

Shelter

In practice, exposure conditions will depend not only on climate but also on the degree of shelter offered by the construction.

Timber systems will benefit the most from high levels of protection from precipitation, wind and direct sunshine, for example windows and doors seated under deep eaves or recessed into walls or sheltered by balconies.

The inclination of the surface is also important. Decreasing the angle of exposure from vertical towards horizontal greatly increases the intensity of weathering for sheltered as well as less-sheltered parts.

Sustainability

The preservation of timber allows the specification of softwood species with lower natural resistance to fungi, as well as all sapwood, where these might otherwise not be used or offer only a very short service life outdoors. Making the most of the timber resource and contributing to waste minimisation and sustainability is imperative to retaining timber as a viable and easily obtained building material. In addition, this reduces pressure on the more naturally durable, scarcer and higher value species. n

About the author

Kevin Underwood Technical Director British Woodworking Federation

References

1. BS EN 350:2016 Durability of wood and wood-based products. Testing and classification of the durability to biological agents of wood and wood-based materials, BSI, 2016

2. BS EN 335:2013 Durability of wood and wood-based products. Use classes: definitions, application to solid wood and wood-based products, BSI, 2013

3. WIS 2/3-71 Specifying externally exposed structural timber, BM TRADA, 2019

Further reading

• WIS 2/3-1 Finishes for external timber, BM TRADA, 2020

• WIS 2/3-16 Preservative treatment for timber – a guide to specification, BM TRADA, 2021

• WIS 2/3-32 Fungi and insect pests in timber, BM TRADA, 2021

• WIS 2/3-60 Specifying timber exposed to weathering, BM TRADA, 2021

• WIS 2/3-63 Modified wood products, BM TRADA, 2021

Paints can protect against weathering.

Photo: George Barnsdale

Raising the bar on product information in the wood protection sector

The UK construction products sector is about to see a culture change on performance information with the publication of the Code for Construction Product Information (CCPI). Developed by the Construction Products Association, CCPI is in response to one of the key findings of the enquiry into the Grenfell fire, which confirmed that shortcomings in product information had contributed to the disaster. Particular concern was raised about inadequate specifier guidance, product information, marketing materials and performance testing claims.

What is the CCPI?

Covering all construction products and systems, the CCPI asks all those involved in marketing, sales, distribution

and installation of construction products to ensure that information provided to buyers is:

• clear

• unambiguous

• accurate

• up to date

• accessible.

This is so that any competent individual working with or installing the products can understand how and where to use them, how they will perform in service and the limitations of use.

For the time being, signing up to the CCPI and its associated auditing requirements will be voluntary. However, the benefits of being able to demonstrate best practice in such a vital area >>

Gordon Ewbank explains how the new Code for Construction Product Information (CCPI) will help reinforce the drive for change in treated wood product information.

The CCPI will cover all construction products and systems.

Photo: Wood Protection Association

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are clear. Ensuring your company is ready to offer customers the highest levels of customer service, technical information and ethical standards of behaviour will enhance your reputation and your potential to improve sales.

How does this impact wood protection projects?

The Wood Protection Association (WPA) has been lobbying for these measures for many years and hopes the CCPI will help to tackle two key challenges for its members and trading partners:

• The safety critical issue of inadequate specifications, false claims and/or poorly performing flame-retardant products.

• The need for accurate, consistent and unambiguous specification of preservative-treated wood products.

Three practical examples of how the CCPI could work would be the avoidance of vague, ambiguous and potentially misleading terms, such as:

• ‘Garden sleepers’, which are not sleepers in the original sense of the word and will not perform to the same degree.

• ‘Green-treated wood’, where end-use application/use class is not specified, meaning that the wrong product may be supplied.

• ‘Flame-retardant-treated Far Eastern plywood’, where the precise species mix of the material is not specified and/ or there is inadequate or inappropriate supporting fire test certification data.

It is a mistake to assume that all pressure-treated wood is the same. While one piece of treated wood may look like any other, the level of preservative protection could be different. That’s because the British Standard for wood preservation, BS 8417, 1 requires that the loading and penetration of preservative impregnated into the wood is tailored to the desired end use. Applications for treated wood are therefore grouped into use classes.

The CCPI, made up of 11 clauses, aims to set the benchmark for how product information is presented and marketed by manufacturers. CCPI will help reinforce the drive for change in treated wood product information. It is recommended that manufacturers align themselves with the ethics behind the development of the CCPI and ensure they can demonstrate to customers their conformity with the principles and practices which it comprises. >>

Source: Wood Protection Association

GIVE NEW WOOD AN AGED LOOK!!

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Code for Construction Product Information: 11 robust ways of working

Manufacturers of construction products who choose to sign up to the CCPI are agreeing to abide by the following requirements to give confidence to those in the supply chain using their product information. These products can therefore be relied on when making decisions about any stage of design, specification, installation, use, maintenance and disposal.

Information creation

1. Have in place a documented sign-off process for creating product information.

2. Have in place a formal version control process for all product information.

3. Do not use misleading or ambiguous wording, phrasing or imagery, and use plain English to ensure accurate representation of product information and performance claims.

Core information

4. Provide specific information where claiming compliance to, or achievement of any certification, classification or industry standard.

5. Provide verifiable information when making any product performance claims that are outside of certification, classification or industry standard tests.

6. Make available the descriptive and physical characteristics of the construction product.

7. Ensure product information is consistent with manufacturers’ supplied products.

Associated information

8. Publish and make easily accessible clear information on handling, installation, operation, maintenance and disposal of construction products.

9. Guarantees/warranties used in product information must state what is covered, excluded and required to comply with the terms. The guarantee/warranty should be transparent and in a format recognised by the relevant sector of industry.

Support and competence

10. Provide technical helpline contact details (telephone and/or email).

11. Have in place a robust training programme (for new and existing personnel) to ensure that anyone conveying product information is competent to the level of knowledge required for their role. n

About the author

Gordon Ewbank CEO Wood Protection Association (WPA)

Further information

WPA is introducing a new Training and Marketing Resources Accreditation Service. Applications will be assessed against the CCPI criteria and the broader need to support good practice throughout the supply chain. Please contact WPA for further details on how to apply for this accreditation.

Further CCPI-related information, guidance and training resources for members’ management, sales and marketing teams are available from the WPA. See www.thewpa.org.uk/ resources-for-treated-wood

Further reading

• WIS 2/3-3 Flame-retardant treatments for timber products, BM TRADA, 2019

• WIS 2/3-16 Preservative treatment for timber – a guide to specification, BM TRADA, 2021

References

1. BS 8417:2011+A1:2014 Preservation of wood. Code of practice, BSI

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Avoiding common clangers

Janet Sycamore identifies how to rectify issues that can affect a cladding project.

Most cladding issues can be avoided through careful design and installation; they can be awkward and costly to rectify once a project is complete.

Fixing faux-pas

If a cladding board becomes detached from the wall or substructure, something is wrong – and it can be a mistake made with the fixing. Cladding fixings must be correctly specified and placed at specific intervals to properly secure the timber – typically dependent on timber species, board profile and arrangement.

Only high-performance coated steel or stainless steel specifically designed for use on external timber cladding should be used. Unsightly black stains (iron staining) are often a telltale sign that incorrect fixings have been used. Such staining is not easy to eradicate and ruins the aesthetic – and in the longer term there is potential for the fixing to consequentially fail.

Fixings placed too close to the board ends is also a common problem as the boards are more prone to splitting and becoming detached from the wall. As a general recommendation, fix at quarter points of board width and a minimum of 20mm in from the board end. Use two fixings at each fixing point unless the board is less than 100mm wide when one fixing can be used.

Figure 2 illustrates two issues – the fixing type and the fixing placement. The black streaks are caused by using nails unsuitable for outdoor use and the top board is fitted through the bottom board, restricting movement and going against good practice recommendations.

Timber is natural and it moves

Wood is hygroscopic – its moisture content is affected by changes in temperature and relative humidity of the surrounding environment. This causes movement across the grain of the timber. Timber cladding should be installed with a moisture content of 16% +/- 4%. This is the mid-range for timber conditions outdoors, which can fluctuate from around 10% to 22% depending on the season. Different species have different degrees of movement and are assigned to movement classes. Ideally, cladding timber should be classed as ‘small’ or ‘medium’ movement. It is also imperative that the design and installation will accommodate the natural seasonal movement of the timber by incorporating the correct movement gaps and/ or overlaps for the profile and species used. >>

Figure 2: An example of board-on-board fixing issues. Photo: TDCA

Figure 1: Standard cladding fixings. Source: TDCA

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Landscape and exteriors Cladding

This is particularly relevant to interlocking cladding profiles such as tongued and grooved (T&G). There is a temptation to fit these boards tightly together, but problems are inevitable if you do, such as bowing or pulling away from the wall. For medium movement species, the recommended maximum width for a T&G board is 125mm, with an associated minimum tongue width of 15mm, to limit the potential for movementrelated issues.

What’s going on behind the cladding is just as important

Battens

A well-ventilated, free-draining cavity should always be included when installing cladding – to channel any moisture (wind-deflected rain) back to the building’s exterior. By using a series of timber battens, a cavity between the cladding and the backing wall structure can be created. Where cladding is used in a vertical arrangement with horizontal support battens, the use of a vertical counter batten is necessary to create a drainage plain and allow free passage of water through it. Counter battens should be a least 50mm wide and 25mm thick. For horizontal timber cladding, only vertical battens are required. These battens should be 50mm wide and 38mm thick, but can be 50mm x 25mm if no side jointing is to occur. These dimensions are to help ensure the battens will accept fixings without splitting.

The battens should be capable of delivering a similar or better service life than the cladding boards. Pressure-treated softwood such as spruce or pine is the go-to material for cladding battens. Pressure treatment should be to a use class 3 specification with the option of a desired service life of 15, 30 or 60 years (30 years being most common). This means that roofing battens are unsuitable as they are generally treated to use class 2 (an interior grade). You should obtain written evidence of treatment detailing appropriate use class and desired service life when you purchase your battens. It would be useful if this was mentioned in any specification notes to plans. The same goes if pressure-treated cladding boards are selected; they too should be treated to use class 3.

Breather membrane

Another common question is ‘where should the breather membrane be positioned?’ It should be placed behind the cladding battens to divide the wet and dry zones of the external wall – not between the batten and the cladding board. n

About the author

Janet Sycamore Timber Decking and Cladding Association (TDCA)

Further information

All the topics in this article and more are covered in The Timber Cladding Handbook, published by the Timber Decking and Cladding Association (TDCA). The TDCA is a not-for-profit company and the money generated from publication sales and inspection services goes towards its work to raise awareness of quality materials and installation good practice. www.tdca.org.uk

Further reading

• BS 8605-1:2014 External timber cladding – Method of specifying, BSI

• External Timber Cladding, 4th edition, BM TRADA, to be published in 2022

• The Timber Cladding Handbook, TDCA and TTF, 2021. Available in digital and hard copy at www.tdca.org.uk/publications

• WIS 1-49 Cladding for timber frame buildings, BM TRADA, 2018

• WIS 1-50 Timber cladding for building refurbishment, BM TRADA, 2019

Figure 3: Minimum movement gaps for T&G and shiplap profiles and minimum tongue dimensions for T&G profiles. Source: TDCA

Figure 4: The correct arrangement for timber battens with vertical timber cladding. Source: TDCA

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Timber for use in garden and landscape construction

Paul Hensey explains how to specify timber for external use.

Timber clad wall made from offcuts of cedar.

Photo: Green Zone Design Ltd

Timber is the most widely used and versatile of all construction materials1 for gardens and landscapes. Plentiful and easily worked, it has proven remarkably adaptable and durable, and belongs to a rare class of materials that can have both a structural and aesthetic value.

Specifying timber for external use

Timber can be used in almost any landscape or garden; however, without suitable selection and treatment many types of timber, when used in external environments and in contact with water, will have a limited service life. While timber is usually categorised into hardwood or softwood, not all are suitable for use in external construction and cladding applications. There are hardwoods that are poorly suited to external applications, such as birch, and softwoods with a natural resistance that perform well in external situations, such as Western red cedar. More practical classifications for the purposes of construction are applicable: see ‘Use classes’ below, and ‘Durability classes’ overleaf.

The majority of timber used externally, available in the UK, is derived from softwood. Hardwood is mostly limited to green oak (green identifies the timber as being unseasoned) and is usually used for simple structures such as raised beds and pergolas. Cost and reduced availability limit the use of hardwoods to specialist and statement items. Without the correct specification, the timber may be seriously compromised and unlikely to reach the intended service life. Designers and specifiers must understand what the intended application is, and therefore which use and durability classes will apply.

Use classes (outlined in BS EN 84172)

Timber is a natural product and, depending on its exposure to the elements, is prone to biological and physical degradation, including bacteria, fungal decay, wood-boring insects, marine borers, ultraviolet (UV) light, weathering and erosion, and movement.

BS EN 335 Durability of wood and wood-based products. Use classes: definitions, applications to solid wood and wood-based products lists five use classes of timber exposure:3

1. Internal – no risk of contact with water (roof timbers)

2. Internal – risk of contact with water (roof tile battens)

3. External – above ground/exposed (fence panels)

4. External – in contact with the ground/in freshwater (fence posts)

5. External – permanent contact with seawater (groynes). >>

“Timber should be specified by its use class and durability class, which will allow the selection of both an appropriate wood species and application of additional preservatives, if required.”

Landscape and exteriors Specification

The classification of the designed structure should be determined with some degree of common sense, for example timber decking boards fall into use class 3, but the accumulation of debris and soil may create areas of high water retention lifting the deck substructure into use class 4.

Durability classes

While use class defines the intended environment timber will be used in, durability classification supports the specification of an appropriate species to achieve a given service life.

Preservative treatment

While some timbers may naturally not achieve the higher classifications they can, with appropriately applied preservatives or processes, have their durability improved considerably. Some methods allow suppliers to offer periods of guarantee for applications in ground of ten years, 20 years or longer.5 The heartwood of some timbers has a natural resilience to decay either in ground or in contact with water and in some circumstances additional treatment may not be required.

Not all timber used externally requires treatment but even those in high durability classes can benefit from imparted protection (such as resistance to UV and rain penetration) and extending the life in service. All treatments benefit from repeated application and allow movement cracks and shakes (splits along the grain as timber ages) to be addressed as they emerge.

Weathering

Note: taken from BS EN 3504 / see Further reading for a useful chart *Timber is from heartwood

Timber should therefore be specified by its use class and durability class, which will allow the selection of both an appropriate wood species and application of additional preservatives, if required. Without treatment, timber may have less than satisfactory durability for structural applications, especially in use class 4 or 5 environments.

Untreated timber will naturally weather to a grey patina. The speed of weathering depends on several factors, including species, but within a year most timbers will have a matured, lead-coloured surface. It can be difficult for an untrained eye to distinguish between oak and cedar, for example. There are proprietary treatments that purport to accelerate the weathering process,6 which are useful for creating the impression of maturity and consistency across all surfaces where natural exposure may inconsistent.

Timber durability chart

Engineered and modified timbers

An alternative to natural, single species timber is the use of engineered or modified timbers. Engineered timbers consist of derivative wood products that are laminated or fixed into composite units such as plywood or glued laminated timber beams making them structurally superior to single species timbers and often suitable for external use, when protected from direct environmental exposure (for example, by an overhang).

Alternatively, timber can be modified so that the cell structure is no longer capable of absorbing water or harbouring microbial activity. Treatment can be through thermal processes (such timbers are often identified as ‘thermo’ woods) or through acetylation (for example, Accoya). These treatments greatly improve the durability class of timbers that naturally might have a poor life in service.

Other considerations

Fire

The use of combustible materials in construction has recently come under increased scrutiny; in particular on elevated structures (such as podiums and balconies). The use of timber in such structures is beyond the scope of this article. Advice and approval should be sought when designing for such locations.

Certification

Timber is a resource that requires constant renewal. Certification is not new, but it can easily be overlooked. The premiums once associated with timber certified by the Forest Stewardship Council® (FSC®), and the Programme for Endorsement of Forest Certification (PEFCTM) no longer apply. It is reasonable, ethical and practical to specify timber from certified sources. Some sources of timber, local plantations for instance, may not carry formal certification; where such a resource is available, it is diligent and worthwhile investigating both their provision and management practices. >>

Oak clad bench stained from gravel pigmentation due to rainfall.

Photo: Green Zone Design Ltd

Seasoned oak pergola beams assembled with galvanised steel brackets and A4 bolts. Photo: Green Zone Design Ltd

Designing for durability

Simple design principles can be applied that will extend the life in service of timber components:

• protect end grain (rounded, chamfered or preferably capped, end-grain sealant)

• avoid unnecessary cross-cuts or notching

• use seasoned timber (this reduces splits and cracks)

• use heartwood rather than sapwood

• prefabricate as much of the structure as possible prior to the application of any treatments

• ensure on-site cuts and holes are sealed using end-grain sealant

• avoid holes close to the end of beams

• decking boards should be placed heartwood side down

• use austenitic stainless steel connections (A2/A2 for screws and fasteners)

• allow for ventilation and air movement around timbers

• avoid timber being in direct ground contact with damp paving, brick or concrete.

Whatever the structure, the design should accommodate periodic inspection, maintenance and replacement, without inconvenient or complex dismantling. The ultimate failure of timber should be anticipated, along with the recommended period and nature of servicing and treatment reapplication. n

About the author

Landscape and exteriors Specification

Paul Hensey FSGD, MCIHort Green Zone Design Ltd

Landscape engineering and Garden Design

References

1. Reynolds, T. and Suttie, E., (both BRE), and Coggins. C., (Wood Protection Association), External Timber Structures (DG503), BRE, 2007

2. BS EN 8417:2011+A1:2014 Preservation of wood. Code of practice, BSI

3. BS EN 335:2013 Durability of wood and wood-based products. Use classes: definitions, application to solid wood and wood-based products, BSI

4. BS EN 350 Durability of wood and wood-based products. Testing and classification of the durability to biological agents of wood and wood-based materials, BSI

5. Wood Protection Association (WPA) code of practice, January 2021: www.thewpa.org.uk/preservative-treatments

6. Sansin WoodForce™ Accel

Further information

• The Timber Decking and Cladding Association (TDCA) www.tdca.org.uk

• Timber Trade Federation (TTF) www.ttf.co.uk

• Wood Protection Association (WPA) www.thewpa.org.uk

Further reading

• BS 8417:2011+A1:2014 Preservation of wood. Code of practice, BSI

• BS EN 350:2016 Durability of wood and wood-based products. Testing and classification of the durability to biological agents of wood and wood-based materials, BSI

• Choose & Use: Timber for garden projects, TRADA Technology, 2012

• WIS 1-31 Timber for landscape architecture, BM TRADA, 2020

• WIS 2/3-1 Finishes for external timber, BM TRADA, 2020

• WIS 2/3-60 Specifying timber exposed to weathering, BM TRADA, 2021

• WIS 2/3-63 Modified wood products, BM TRADA, 2021

• WIS 2/3-71 Specifying externally exposed structural timber, BM TRADA, 2019

• WIS 4-28 Durability by design, BM TRADA, 2019

• Wood Protection Association (WPA) code of practice

January 2021: www.thewpa.org.uk/preservative-treatments

• www.trada.co.uk/media/12056/timber-durability-chart.pdf

Cumaru seating, part of the legacy plan for the London 2012 Olympic site.

Photo: Claire Borley Photography / LDA Design

Setting the Standards

Through our industry schemes – the BWF Stair Scheme and the BWF Fire Door Alliance – we champion best practice, innovation, industry standards and longevity in design.

The BWF is the trade association for the woodworking and joinery manufacturing industry in the UK. We offer advice, support and regulatory information to our 500+ members, as well as guidance for those looking to specify timber products.

w. bwf.org.uk e. bwf@bwf.org.uk

Innovative renovation

How windows and staircases can be used to transform a space, no matter the size.

The Two and a Half Storey House is a masterwork of three-dimensional imagination in timber and an ingenious solution to a common problem: how to create an extra bedroom in a two-storey terrace house. In the case of the conventional terrace house with a doublepitched roof, a loft extension would have been the obvious answer; however this was not a conventional terrace but part of a two-storey two-bedroom 1970s terrace in a former council housing estate in Stoke Newington, London.

The front brick wall rises above the first floor where it is clad with vertical tile-hanging and supports a mono-pitched tiled roof sloping down to the rear wall. The local planners would not permit any loft extension that rose above the highest point of this existing roof and the owners had already received two planning refusals for proposals for a single-storey loft extension which exceeded this height.

Spacious solutions

The owners, a couple with a young child and a second baby on the way, needed more space, but were unable to afford a threebedroom house in the same area. They asked the practice Bradley Van Der Straeten to investigate what could be done to fit another bedroom within these restrictions. The architect approached the design as an interlocking jigsaw, as George Bradley explains: ‘We knew the half height of the loft was fixed so the design was all about creating two interlocking floor levels in the space of one and half floors. We may have given less footprint but we created more volume and an additional bedroom by using it creatively. The whole design of the project hinged on using the ceiling of the bedroom below as a bed platform for the bedroom above, which is spacious and light due to effective use of roof windows. Integrating the bedframe into the fabric of the design allowed space to be freed up for other things such as the communal circulation spaces.’

Timber, in particular Finnish birch-faced plywood, was the key material in the achievement of a design that was dependent on close attention to detail. The timber frame structure is stiffened and lined with birch-faced plywood to create wall linings and ingenious storage spaces. The birch-faced plywood panels link the new loft bedroom with the updated first-floor bedrooms, and the warm and tactile nature of the birch finish enhances the spaces.

Creating light and new levels

The key to the achievement of the new loft bedroom was the creation of a series of interlocking volumes designed precisely to achieve the necessary headroom heights on each floor. The new loft bedroom extends with a very gently sloped roof from front to rear, terminating in a dormer window that looks west over the garden and the surrounding roofscape.

Directly below the dormer window is the bed platform, raised 600mm above the floor and rising to a ceiling with exposed timber joists and a headroom height of 1450mm. The bed platform is lined on all three sides with birch-faced plywood >>

Next to the staircase is an internal window that links upper and lower spaces.

Photo: FRENCH+TYE

Joinery Case study

and built-in plywood shelves and storage spaces. Other walls of the loft bedroom are lined with shelves and cupboards of birch-faced plywood with exposed edges and the radiator is screened by a set of plywood strip louvres.

The floor-to-ceiling height of the loft bedroom is 2150mm –a height that has been achieved by lowering the floor immediately below it to a height of 1500mm. This lowered section on the first floor is used for a variety of storage spaces; a large storage room with double doors opening off the corridor, another storage cupboard opening off the half landing to the staircase and a wardrobe that runs the full length of the internal wall to the second bedroom.

At one side of the loft bedroom is a raised plinth that accommodates the 2100mm headroom height to the first-floor corridor immediately below it. The plinth is used as a bench seat, the base of a built-in wardrobe and as a bookshelf.

The construction of the loft bedroom consists of a highly insulated timber frame with a single-ply membrane roof covering and a dormer window clad with roof tiles. Two raised roof windows in the roof, one above the staircase and another above the bed, flood the interior with light. The new timber staircase was built directly above the original staircase flight and is flanked by a solid balustrade of paired 24mm plywood

Project details

Completion date: 2019

Building type: Terrace house extension

Location: Stoke Newington, London

Architect: Bradley Van Der Straeten Architects

Structural engineer: Constant Structural Design

Main contractor and joinery: Gregos Builders and Decorators

Timber supplier: James Latham

Timber elements: Roof extension structure, wall linings and internal fittings

Timber species: Finnish PEFCTM and FSC®certified birch-faced plywood

Awards

Wood Awards 2020

– Highly Commended, Interiors

New London Architecture 2021

– Winner, Compact Design of the Year

panels. The loft bedroom is separated from the staircase by a fire-rated door and a panel of 8mm toughened fire-rated glass; it gives a visual link to the floor below, allowing parents to keep an eye on their eldest son playing in his new bedroom.

On the first floor the original bathroom has been retained and a new en-suite bathroom has been installed alongside with access from the master bedroom. The first-floor cupboards have a timber frame with birch-faced plywood panels and fire-resistant plasterboard to achieve 30-minute fire-resistant construction. The ground floor of the house has also been opened up to create a generous living, dining and kitchen area overlooking the garden, with a large sliding glass door that leads out onto an area of timber decking. n

Further reading

• The full case study can be downloaded from www.trada.co.uk

• WIS 4-16 Timber in joinery, BM TRADA, 2020

Two large roof windows flood the interior with light.

Photo: FRENCH+TYE

UKCA marking for pedestrian doorsets with fire-resisting and smoke control characteristics

There is still significant confusion among fire door manufacturers regarding UKCA marking, as the situation is not as straightforward as it is for other construction products. Peter Barker explains the current regulatory and legislative landscape.

All construction products that were previously CE marked under the Construction Products Regulation will need to be UK Conformity Assessed (UKCA) by the 1 January 2023 to be placed on the market in Great Britain.1

UKCA marking

UKCA marking was introduced as a consequence of the UK leaving the EU and replaces CE marking when placing construction products on the market within Great Britain. The relevant legislation that makes amendments to the regime for construction products in Great Britain is the Construction Products (Amendment etc) (EU Exit) Regulations 20191 and 20201 which, broadly speaking, is a copy of the Construction Products Regulation that continues to be used within the EU27 (the 27 member countries within the EU).

In Northern Ireland, CE marking will continue to be accepted, as it will across the EU27; alternatively, a CE UKNI mark can be used for construction products that will be sold for use only within Northern Ireland.

At present, only products that are covered by the scope of a designated standard need to be UKCA marked. In future, UKCA marking will also be required for products that conform to a UK Technical Assessment, where one has been issued for the particular product type.

Designated standards

All harmonised standards that gave presumption of conformity with EU law, such as the Construction Products Regulation, became designated standards in the UK on 1 January 2021. The designation process is a formal recognition of the standard by government and does not change the content of the standard. Therefore any product within the scope of a harmonised standard will also be within the scope of a designated standard.

For fire-resisting pedestrian doorsets there are two designated standards (often termed product standards) that are of relevance: EN 14351-1 2 and EN 16034 3 >>

“UKCA marking is currently a continuation of CE marking but for application in Great Britain only; however, after the Building Safety Bill has been enacted we are likely to see a strengthened Construction Products Regulation, with other regulatory requirements called for when placing safety critical construction products on the market.”

-L ATERALLY TESTED, UKAS ACCREDITED

TIMBER FIRE DOORSETS

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We are experts in our field and specialise in the supply, installation and ongoing maintenance of Fire Doorsets.

We offer our services to Government Organisations, Local Authorities, Housing Associations, Housing Trusts, Historical Authorities, Education Facilities, Health Trusts and Blue Light Services throughout the UK.

We deliver quality works and programmes designed around our clients' bespoke needs and requirements provided by our own DBS verified staff.

OUR SERVICES INCLUDE

Full Building Solutions – Including glazed or unglazed Flat Entrance, Communal and Service Room Doorsets in either FD30s or FD60s specification

All Fire Doorsets conform to BS476 Part 22, they carry Primary Test Evidence and are UKAS Accredited. They conform to the very latest Legislation and Regulations and are all Bi-Laterally Tested and CE Marked

Secured by Design & PAS24:2016 certified

Includes factory fitted CCS data pin for effortless cloud-based, real time asset management

Installed by our very own, experienced team of BM TRADA Accredited engineers

UKAS accredited Fire Doorset Inspection, Survey, Maintenance and Servicing Solutions

Fully Certified, 48hr Responsive, Emergency Fire Doorset Supply & Installation service

Essential Service Provider status with Covid-Secure safeguarding policies & procedures in place

DELIVERY WITHIN 6 WEEKS FROM POINT OF ORDER FOR BOTH SOLID & GLAZED TIMBER FIRE DOORSETS

Fire-resisting and smoke control doorsets

Reading the scope of the designated standard to see what products are listed and what products are specifically excluded is key to understanding whether a particular door needs to be UKCA marked. Fire-resisting doors are unusual as EN 14351-1 has to be used with EN 16034, so only a fire-resisting door that falls within the scope of both standards is required to be UKCA marked.

Currently, it is only necessary to UKCA mark fire-resisting and smoke control doorsets that separate the internal climate from the external climate of a construction, where the doorset is intended to be used in fire and/or smoke compartmentation and/or escape routes, and when it is supplied complete with all essential parts and from a single manufacturer. It is not currently possible to UKCA mark internal doorsets, as the standard EN 14351-2 4 was not cited in the Official Journal of the European Union at the time the UK officially exited the EU, and the standard has not yet been designated by the UK Government.

If the door is not supplied with all components and it is necessary to source components from another manufacturer to complete the construction, it is termed a ‘door assembly’ and this falls outside the scope of the designated standards and cannot be UKCA marked.

British Standard test evidence

British Standard (BS) test evidence is still listed as a way of demonstrating the performance of fire-resisting doors in the guidance documents used for complying with UK Building Regulations; however, it is necessary to understand the difference between the Building Regulations and the Construction Products Regulation.

Building Regulations

Building Regulations set the requirements for the performance of buildings and construction works, and therefore the performance of construction products. There are different statutory guidance documents used within the UK that provide practical guidance about how to meet the functional requirements of the various parts of the Building Regulations. For example, Approved Document B5 provides guidance for meeting the fire safety requirements of the Building Regulations in England and Wales, and Approved Document 76 gives guidance on how to establish the fitness of materials and adequacy of workmanship for building work.

The building design, occupancy and location of a doorset within a building is likely to lead to several different performance requirements covering health and safety, welfare and convenience, access and conservation of fuel and power; this is what shapes the specification of a doorset for a particular location within a building.

Construction Products Regulation

The Construction Products Regulation is a separate regulatory regime that places legal obligations onto manufacturers that are making products available on the market, where the products fall within the scope of the designated standards. In the case of external fire-rated pedestrian doorsets a manufacturer must meet the requirements of the Construction Products Regulation to place the product on the market, as well as satisfy the performance requirements of the Building Regulations. The designated standards call up European Norm (EN) test and classification standards and BS test evidence cannot therefore be used.

Building Safety Bill

CE marking within the EU was intended to remove technical barriers by introducing a common technical language to facilitate the single market; at the moment, UKCA marking follows the same legal framework and requirements. However, the Building Safety Bill7 (new primary legislation) that is currently progressing through Parliament will create regulations to make sure that:

• construction products on the market are subject to a general safety requirement;

• existing arrangements for products that perform to a designated standard are retained; and

• new requirements are established for a list of safety critical products.

The purpose of the Building Safety Bill is to:

• enhance market surveillance powers;

• allow for regulation of the accuracy of claims about product performance; and

• provide powers to repeal and redesign the construction products regulatory regime to meet the demands of the UK market.

It is not possible to know precisely what will happen with UKCA marking until the Building Safety Bill has been enacted along with the raft of secondary legislation. However, on reading the proposed Building Safety Bill and the clear intention of enhancing the existing regulatory regime for the UK market, it is reasonable to assume that we are likely to see an increase in specific conformity assessment and market regulatory requirements for safety critical construction products, such as fire-resisting doorsets.

National third-party certification schemes

National certification schemes for construction products (Type 5 product schemes as defined in ISO 17067 8), such as Q-Mark and Certifire, go beyond the requirements given in designated product standards and their associated Assessment and Verification of Constancy of Performance level. For example, the Q-Mark and Certifire schemes for fire-resisting doors include additional labelling and traceability requirements in addition >>

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With an extensive range of beautifully crafted stylish doors, Deanta offers a solution for every space.

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Fire doors

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Fire safety is at the core of our business. At Deanta we manufacture all our doors, ensuring that every single component not only meets the required standards, but exceeds them. We believe in investing heavily in research to develop the safest, most reliable fire safety products on the market. We extensively test our product range through independent, third-party certification schemes. Every single fire door in our collection has BM TRADA accreditation and all Deanta Architectural FD30 fire doors are Certifire approved and acoustic tested up to 31dB.

to a centralised listing for certified manufacturers, as well as technical updates to maintain the state of the art regarding product scope or scheme requirements, as necessary.

The Q-Mark and Certifire schemes also incorporate ongoing audit testing, which is a higher requirement than that specified for doorsets covered by EN 14351-1 and EN 16034. Audit testing provides feedback loops on system and product performance. It is particularly important, as materials and processes often change over time, which can lead to an unexpected fall in product performance compared with that demonstrated by the initial type testing.

While national certification schemes can offer increased added assurance in terms of product compliance with the relevant performance standards, they do not negate the need to comply with the Construction Products Regulation and associated designated product standards. National certification schemes can be used in addition to UKCA marking where they offer enhanced safety, but must not conflict with the requirements of the Construction Products Regulation.

Third-party certification continues to demonstrate to the consumer the highest level of added assurance for product compliance. Certification schemes also help to plug gaps in the regulatory system, in terms of assessing conformity.

Conclusion

It is entirely possible that a project involving fire and/or smoke doorsets that are both internal and external will have to meet the same national Building Regulation requirements in terms of the level of fire resistance and smoke leakage performance, but with the fire-rated external doorsets also requiring UKCA marking before they can be placed on the market and installed within the building.

UKCA marking is currently a continuation of CE marking but for application in Great Britain only; however, after the Building Safety Bill has been enacted we are likely to see a strengthened Construction Products Regulation, with other regulatory requirements called for when placing safety critical construction products on the market. For further information and guidance on the construction products regulatory framework, it is worth referring to the factsheet9 that has been produced by the Department for Levelling Up, Housing & Communities (DLUHC).

Given the announcement by Ministry of Housing Community and Local Government (MHCLG) in August 2021 extending the deadline for acceptance of CE marking within the GB market to the end of 2022, there is a little more breathing space within the industry to understand UKCA marking and comply with the Construction Products Regulation – but time is running out. n

About the author

Peter Barker Technical Manager Warringtonfire

Further information

To find out more about Warringtonfire’s certification schemes, visit www.warringtonfire.com

Further reading

• Technical Bulletin: UKCA marking, BM TRADA, 2022 (www.bmtrada.com/certification-services/third-partycertification-non-fire/ukca-marking-for-construction-products)

• WIS 1-13 Performance of fire-resisting timber-based doorsets, BM TRADA, 2018

• WIS 1-32 Upgrading timber joinery doors for fire resistance, BM TRADA, 2020

• WIS 1-47 Timber external doors, BM TRADA, 2019

References

Note: The BSI numbering policy is to adopt the European Committee for Standardisation (CEN) numbering, prefaced with BS when the standard is published for use in the UK

1. www.gov.uk/guidance/construction-products-regulation-ingreat-britain

2. EN 14351-1:2006+A2:2016 Windows and doors – Product standard performance characteristics – Windows and external pedestrian doorsets, BSI

3. EN 16034:2014 Pedestrian doorsets, industrial, commercial, garage doors and openable windows – Product standard, performance characteristics – Fire resisting and/or smoke control characteristics, BSI

4. EN 14351-2:2018 Windows and doors – Product standard, performance characteristics – Internal pedestrian doorsets, BSI

5. Approved Document B, Volume 2, 2019 Edition: www.gov.uk/ government/publications/fire-safety-approved-document-b

6. Approved Document 7, 2013 edition incorporating 2018 amendments – for use in England: www.gov.uk/government/ publications/material-and-workmanship-approved-document-7

7. https://publications.parliament.uk/pa/bills/cbill/58-02/0139/ en/210139en.pdf

8. BS EN ISO/IEC 17067:2013 Conformity assessment –Fundamentals of product certification and guidelines for product certification schemes, BSI

9. www.gov.uk/government/publications/building-safety-billfactsheets/construction-products-regulatory-framework-factsheet

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IT IS ESSENTIAL THAT FIRE DOORSETS ARE INSPECTED & MAINTAINED REGULARLY

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EXPERTS IN FIRE DOORSETS

We have unparalleled and extensive experience with Fire Doorsets and Fire Stopping works, holding no less than three UKAS Certifications among many other accreditations and endorsements.

We are Third Party Accredited for Fire Doorset Installation, Fire Doorset Maintenance and Fire Stopping Works, all of which we have held for over 8 years and are awarded by BM TRADA.

We are certified to carry out a full, comprehensive inspection of all your Fire Doorsets using the Q Mark system, once the inspection is completed a comprehensive report is then generated, detailing the overall condition of the Doorset and any areas of non-compliance that will necessitate further work. The report will then be added to your database, creating an asset register of Fire Doorsets. This register will then hold all the relevant information and certification for each individual Doorset and be the basis for planning future inspections and works.

MAINTENANCE OF FIRE DOORSETS

A Fire Doorset is an intricately designed and engineered device that is conceivably the most significant fire safety measure on your premises.

Installed correctly, it will slow down the distribution of fire and smoke within the building by containing it to a particular compartment or room, giving the buildings occupants vital extra time to escape and the Fire Service longer to respond appropriately. A Fire Doorset will also help to reduce the risk of the building integrity being damaged beyond viable repair in the event of a fire.

Too often Fire Doorsets are installed inadequately or merely left in a state of disrepair. It is imperative that your Fire Doorsets are regularly inspected and maintained accordingly, allowing them to perform as they were designed to, on the one and only occasion that they will be required to do so.

It is your responsibility to ensure that adequate measures are in place for the inspection and maintenance needs of your Fire Doorsets, with the maintenance records being made available should you need to substantiate them.

OUR CLIENTS

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FIRE DOORSET CHECKLIST:

• Is the Doorset certified?

• Do you have maintenance records for the Doorset available?

• Is the correct Doorset in place?

• Does the leaf thickness meet the required standard for the scenario it is intended for?

• Is the Doorset bowed, twisted, warped or damaged?

• Does the Doorset have the correct seals fitted? Are they damaged or missing?

• Does the Doorset close correctly? Will it self-close onto the latch correctly?

• Is there a consistent gap around the edge of the frame within the allowed tolerance of 2-4mm?

• Are the frames and architraves in good condition? Do they meet the required thickness? Are they made from the correct material? Are they securely fitted and installed correctly using the correct fire stopping materials?

• Are the correct number of hinges on your Doorset? Are they to the required certified standard and carry a CE Mark? Are they fitted correctly with no missing screws? Are they in good condition and work correctly?

• Is the correct certified glass within your Doorset? Is the glass free from damage? Are the beads holding the glass firmly in place?

• Is the correct signage visible on the Doorset?

• Are your Doorsets inspected and maintained by a Third-Party Accredited, UKAS Certified company?

Explaining UKCA marking

After 47 years of membership, the UK left the EU on 31 January 2020. There followed a transition period during which the UK continued to participate in the EU Customs Union and the European single market. A Trade and Cooperation Agreement was negotiated so that the transition period ended at 11pm on 31 December 2020 with a deal called the EU-UK Withdrawal Agreement.

For the UK construction industry, the obligation to comply with the EU Construction Products Regulation (EU CPR) ended with the termination of the transition period and a new regulatory framework applies for construction products from 1 January 2021. This framework retains most of the characteristics of the EU CPR, but is complex in the way requirements vary between Great Britain (GB), Northern Ireland and countries within the European single market.

The UK Construction Products Regulations (UK CPR)

In 2019, as part of the UK Government’s preparations for leaving the EU, a new Statutory Instrument SI 2019 No. 4651 (the 2019 Amendment) was passed combining several pieces of existing legislation for Construction Products. These were:

• Regulation (EU) No. 305/2011 – the EU CPR.

• SI 2013 1387 – UK CPR 2013; these are the UK regulations that came into force with the EU CPR and made provision for its enforcement.

• Tertiary legislation originating in the EU, which was amended or, in a few cases, repealed. The amendments substituted references to the UK for references to the EU, rather than making technical alterations.

The list of tertiary legislation included in the 2019 Amendment is extensive (see Annex A2), but the legislation provides the legal basis for many assumptions made for construction products. In particular, the legislation establishes the reaction-to-fire classification of construction products and sets the system of assessment and verification of constancy of performance, commonly referred to as the Attestation and Verification of Constancy of Performance (AVCP) system or AVCP level, that must be applied for each product type. Standards committees and bodies involved in testing and certification may not change these assumptions.

The principal objective of the 2019 Amendment was to retain the EU CPR with as few changes as possible after the UK left the EU. In particular, the Amendment introduced UKCA marking (UK Conformity Assessment) to replace CE marking and provided for UKbased Approved Bodies to fulfil the tasks of EU Notified Bodies.

Negotiation of the Trade and Cooperation Agreement in 2020 led to a special status for Northern Ireland, enshrined in the Northern Ireland Protocol, so a further Amendment, SI 2020 No. 1359 (the 2020 Amendment), was necessary before the 2019 Amendment came into force. The 2020 Amendment ensures that the EU CPR continues to apply in Northern Ireland and restricts the 2019 Amendment to GB only (England, Scotland and Wales). Therefore, construction products that are CE marked can continue to be placed on the market in Northern Ireland.

However, if that CE mark is based on an assessment by a body in the UK (including Northern Ireland) it must be accompanied by a UK(NI) indication (i.e. CE+UK(NI) marking) since the assessment is not accepted outside the UK. Similarly, UKCA marking is not accepted in Northern Ireland and CE+UK(NI) marking is not accepted in GB for goods that originate in GB.

Within the NI Protocol the UK Government has undertaken to provide qualifying Northern Ireland goods unfettered access to the GB market, so these goods should be accepted in GB irrespective of their marking.

Neither Amendment is a consolidated text, so it is still necessary to refer to the original legislation for its substance. The 2019 Amendment is helpful in that it has hyperlinks to all the pieces of legislation that it cites. >>

This extract comes from a BM TRADA technical bulletin and helps make sense of the post-Brexit changes to the certification of construction products.

UK(NI) mark

UKCA mark

The changes

The Amendments came into force on 1 January 2021. The most important changes are shown in Table 1, whereby it is clear that the structure of the EU CPR is retained in its entirety.

The change in applicability of conformity marking by market is shown in Table 2 for the period 2020–22. Transitional arrangements allow CE-marked goods that meet EU requirements to be placed on the GB market until 1 January 2023, but there is no reciprocal arrangement for UK-assessed products to be placed on the EU single market during 2022.

The UK Government has legislated to provide a definition of qualifying Northern Ireland goods (SI 2020 14543) that will enjoy unfettered market access to the GB market. The definition includes any domestic goods that have undergone processing operation in NI only and which are not under any kind of customs restrictions.

Until 1 January 2023, products that meet Northern Ireland’s requirements and are appropriately marked (i.e. CE marking with or without UK(NI) indication) can be placed on the entire UK market irrespective of whether they are qualifying Northern Ireland goods.

Manufacturer obligations

The obligation on manufacturers to make a Declaration of Performance (DoP) and affix a mark on their product is unchanged. However, they must now decide in which markets they wish to place their products: the EU single market, Great Britain or Northern Ireland.

Dual marking

Dual marking is not prohibited, so a product can be placed on any one of these markets providing the relevant mark is affixed. The exception is the combination of CE marking with CE+UK(NI) marking since the two instances of ‘CE’ make conflicting claims of conformity.

Each marking will require its own DoP, AVCP certificate or Assessment of Performance (as applicable) and supporting documentation.

Third country status

From 1 January 2021, manufacturers based in GB are in a third country with respect to the European single market and Northern Ireland. Conversely, manufacturers in the European single market are in a third country with respect to GB, although the requirements for marking only apply from 1 January 2023. Manufacturers in Northern Ireland are effectively in the European single market, but also enjoy unfettered access to GB, which implies they are not subject to third country manufacturer obligations in either of these markets.

Once a manufacturer has established whether or not it is in a third country, its obligations are essentially unchanged to those in 2020. If the product falls within the scope of a designated standard or a harmonised standard, the manufacturer must:

• ensure all the necessary assessment tasks are completed in accordance with the system of attestation of conformity specified for the product

• compile the required technical documentation, make a DoP available and affix the conformity marking to the product

• establish and maintain a factory production control system. >>

Table 2: Conformity marking by market, 2020–23

Table 1: Summary of changes from the EU CPR to the UK CPR

Sustainable sourcing through Global Supply Chain arrangements

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Conformity

Depending on the AVCP system for the product, the manufacturer may need to appoint a Conformity Assessment Body (CAB), which is a Notified Body for the European single market or an Approved Body for the UK market. The CAB may be designated as a testing body or a certification body.

The UK Government has published a list of designated standards that is the same as the Official Journal of the European Union (OJEU) list of harmonised standards. This provides a basis for UK Approved Bodies to carry out their tasks.

If the product falls within the scope of a European Assessment Document (EAD), and the manufacturer wishes to affix CE marking for the EU single market, it must first arrange for a European Technical Assessment (ETA) to be issued, then complete the same tasks as for a harmonised standard. For the GB market, the UK Government has recently adopted a list of pre-Exit EADs that can be used to produce UK Technical Assessments (UKTAs) as a basis for UKCA marking. The cited EADs are those that were current in the EU immediately before 31 December 2020, which includes some European Technical Assessment Guidelines (ETAG) that could be used as EADs at that point in time, but excludes any new or revised EADs that have been adopted in the EU since.

There are several systems of AVCP for the attestation of conformity that are summarised in Table 3. The requirements for CAB involvement at each system are common to both the European single market and the UK market, but there is no mutual recognition of the CABs. The European Commission has withdrawn recognition of UK CABs with effect from 1 January 2021 and the UK is likely to reciprocate on 1 January 2023.

For AVCP 1, the test laboratory should be International Laboratory Accreditation Cooperation (ILAC) accredited to BS EN ISO/ IEC 17025:2017, 4 but the responsible CAB is a certification body. The laboratory should also meet the independence requirements of Article 43 of the CPR; using laboratories that are Notified or Approved Bodies ensures this is met. This implies that Notified Certification Bodies in the EU may continue to choose to accept test evidence from accredited laboratories based in the UK. UK Approved Certification Bodies working at AVCP 1 are similarly entitled to accept test evidence from laboratories based outside the UK to support UKCA marking.

For AVCP 3, the Commission has decided not only that future AVCP 3 test evidence is not accepted, but has retrospectively withdrawn the recognition of historic AVCP 3 test evidence from UK-based laboratories. This is of concern to manufacturers placing products on the European single market that have hitherto relied on this evidence for their DoPs. The UK will accept AVCP 3 test evidence from EU-based laboratories to support CE marking until 31 December 2022, but based on current understanding requires evidence from UK-approved laboratories for UKCA marking from 1 January 2023, which may give rise to further concerns for manufacturers supplying the UK market.

Authorised representative obligations

An authorised representative is mandated by the manufacturer to act on its behalf within the European Single market or the UK market. The representative must be established within the territory of the market where it is acting, irrespective of where the manufacturer is based. There is no obligation on the manufacturer to mandate a representative, but it may be useful for third country manufacturers.

The authorised representative must carry out the obligations in the mandate, which as a minimum include obligations to respond to requests for information from national authorities and to cooperate with national authorities to eliminate risks. The representative may be mandated to place the conformity mark on the product, but the manufacturer may not delegate its obligation to draw up technical documentation. The manufacturer must include the contact details of any authorised representatives in the DoP for the product. >>

Table 3: Summary of AVCP systems applicable to both the EU CPR to the UK CPR

Importer obligations

Many distributors in the UK market and the European single market may become importers as a consequence of Brexit. As with authorised representatives, importers must be established within the territory of the market where they operate. Importers have greater obligations than distributors since they are bringing the product into the market for the first time and must ensure it is compliant. Their obligations may be summarised as follows:

• ensure the conformity assessment has been carried out and that the manufacturer has drawn up the technical documentation and the DoP

• ensure that the product is marked correctly for the market

• provide their contact details with the product

• check the instructions are in a language easily understood by consumers

• keep registers of complaints and recalls, and conduct checks on the product if warranted

• inform market surveillance authorities (Trading Standards in the UK) if they realise the product is non-compliant

• provide information to market surveillance authorities on request

• keep records for at least ten years.

Many companies are well equipped to handle these obligations as they will previously have imported goods from outside the EU. However, some companies may look for guidance to industry associations and representatives.

The risk of divergence in the regulation of construction products

The complexity of the marking requirements, arising from creating three markets where previously only one existed, masks the current complete alignment of the technical requirements for designated and harmonised standards. It is in the interest of manufacturers for this alignment to continue, as it is likely to reduce the cost of compliance for those that operate in more than one market.

However, there are many reasons to assume that divergence will occur. For instance, the UK may decide to cite current published standards as designated standards rather than persist with the same versions as the EU, or the current review of the EU CPR by the Commission may lead to a revision that the UK does not wish to adopt. Divergence already exists in that EADs adopted in the EU since 1 January 2021 are not cited for UKCA marking. It remains to be seen whether UK Technical Assessment Bodies will produce new UK Assessment Documents that align with the EADs published by the European Organisation for Technical Assessment (EOTA) since the EU exit date.

Furthermore, the UK Government has announced the establishment of a Regulator for construction products, explicitly driven by evidence from the Grenfell Tower Inquiry. The announcement states: ‘Businesses must ensure that their products are safe before being sold in addition to testing products against safety standards.’ Although few details are yet available, the announcement implies that the UK Government is already looking beyond the current UK CPR. n

Further information

Prepared by the BM TRADA publishing team with the assistance of Hugh Mansfield-Williams, Niresh Somlie and Philip Howard. The full bulletin is available to download from the TRADA website: https://www.trada.co.uk/publications/ other-technical-guidance/technical-bulletin-ukca-marking/

References

1. STATUTORY INSTRUMENTS 2019 No. 465. The Construction Products (Amendment etc.) (EU Exit) Regulations 2019 www.legislation.gov.uk/uksi/2019/465/ contents/made

2. Annex A can be found in the full technical bulletin at www.trada.co.uk/publications/other-technical-guidance/ technical-bulletin-ukca-marking

3. STATUTORY INSTRUMENTS 2020 No. 1454 The Definition of Qualifying Northern Ireland Goods (EU Exit) Regulations 2020

4. BS EN ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories, BSI

T:

Since the merger GP Wood is committed to investing 5 million in a range of initiatives including product enhancements.

the merger, GP Wood have invested heavily in a range of upgrades and initiatives to modernise our facilities and enhance our products.

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GP Wood is one of Ireland’s largest suppliers sawn softwood products.

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Ireland HQ GP Wood, Main Street, Enniskeane, Co. Cork. Ireland

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GP Wood understands the importance of softwood as a valuable renewable resource and is committed to promoting its use in an expanding range of new sustainable applications.

GP Wood was formed in April 2013 as a result of the merger of two of Ireland’s most successful and long established timber processing companies; Grainger Sawmills Ltd and Palfab Ltd, both based in County Cork. UK

Taylor Maxwell House, The Promenade, Clifton, Bristol, BS8 3NW

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Please call our Sales Team to discuss your next project.

New in the BM TRADA Bookshop

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Sustainable wood flooring: an analysis

Peter Kaczmar examines the meaning of ‘environmentally sustainable’ wood flooring.

Select cask oak flooring.

Photo: Jeffreys Interiors

Materials

Timber flooring has enjoyed a strong market position over the past two decades and much of the rationale behind this has been due to its unique visual appeal as a naturally sourced building material. However, more recently, and increasingly, the use of timber floor coverings has been advanced on the grounds of its environmental credentials.

Environmental sustainability

Converting a log to boards generally uses little energy and produces less toxic pollution to the environment than the production of most other construction materials, although the extent of transport, drying, machining and coating required, together with the maintenance demand of the end product, all have an obvious bearing on its total embodied energy.

The ‘environmental’ dialogue has shifted away from notions of embodied energy to those of ‘sustainability’, principally motivated by the need to maximise carbon sequestration in harvested products within the built environment.

Daly’s principles

Sustainability is the ability to continue a defined behaviour indefinitely. However, this definition, in the context of the built environment, makes little or no allowance for the environmental impact of that behaviour. This has subsequently led to the concept of ‘environmental sustainability’ based on pioneering work by Herman Daly1 who, in 1990, proposed that:

1. For renewable resources, the rate of harvest should not exceed the rate of regeneration (sustainable yield);

2. The rates of waste generation from projects should not exceed the assimilative capacity of the environment (sustainable waste disposal);

3. For non-renewable resources, the depletion of the non-renewable resources should require comparable development of renewable substitutes for that resource.

By applying Daly’s principles to the manufacture of solid wood and wood-based floor coverings, the first two principles can be met, some would say, relatively easily by ensuring that >>

“For timber flooring to be considered as truly sustainable, its in situ service life must exceed, or at least equal, the time taken for the wood from which it is made to have grown in the first place .”

Materials Timber flooring

Freedom to design with complete peace of mind

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ignition and growth in the critical early stages of development, making it an appropriate consideration for modern methods of construction.

Smart, consistent and strong, with even greater flame retardance, ‘B’ sure to do the right thing with SMARTPLY MAX FR B**.

all timber used in its manufacture (i.e. during primary and secondary processing) is:

• sourced, harvested and processed using certified and legitimate renewable stocks;

• harvested, processed, manufactured and installed using renewable energy sources;

• disposed of at end of life in a manner that can be assimilated by the environment.

In today’s parlance, the latter is likely to mean either incineration for energy generation or composting, but only if the amount of carbon released can be demonstrably balanced by the regenerative demands of successive plantations used in the manufacture of any future wood or wood-based flooring products that are used to replace it on a ‘quantum-for-quantum’ basis.

Not all wood flooring will necessarily be in compliance with Daly’s third principle since this will depend on whether all the resources used in its manufacture can be shown to be renewable (and biodegradable). This may include a host of man-made polymers and composites used in the production of multi-layered and engineered flooring, including the adhesives used in its manufacture or indeed the materials going into the production of the seals, lacquers or overlays that are used to finish it. The demands of Daly’s third principle are unlikely to be satisfied by flooring variants whose manufacture involves non-renewable materials such as melamines or non-degradable polymers and composites. In reality, this means that only flooring made from unlacquered and untreated solid wood is likely to come close to satisfying the above principles of environmental sustainability.

Social and economic factors

Since their original introduction, it is now generally recognised that Daly’s principles do not take account of social or economic factors that a sustainable system, reasonably, should be capable of supporting. This automatically introduces additional pressure on whether a particular commodity can truly be said to be environmentally sustainable since the achievement (and maintenance) of a given quality of life is likely to go hand in hand with regular alterations in lifestyles and/ or local environment. This can be driven by a variety of factors from moving house to fashion or even boredom which, in the case of wood flooring, may prompt its regular and premature replacement before its functional service life has come to an end, as fashions or needs dictate.

This introduces a conundrum in the concept of environmental sustainability in that it exerts additional pressure on Daly’s first two principles of sustainable yield and sustainable waste generation. Expressed in simple terms, for timber flooring to be considered as truly sustainable, its in situ service life must exceed, or at least equal, the time taken for the wood from which it is made to have grown in the first place. By curtailing its in situ service life through premature and/or frequent replacement, a carbon deficit will be produced and any credentials of environmental sustainability of the flooring will be diminished or lost >>

Tectonic® Regency Antique Grey Aged Oak boards, Georgian House, Somerset.

Photo: Chaunceys Timber Flooring

Bristol Tectonic™ – FSC®-certified oak flooring at The Cow Shed Restaurant, Bristol.

Photo: Chaunceys Timber Flooring

Cascading timber utilisation

To offset this phenomenon, the concept of cascading timber use can show how to prolong the useful lifetime of the timber from which the flooring was made over and above the time taken for the wood to grow. This can be done through a process of recycling and re-use of the original flooring either by reworking or through its incorporation into new products (e.g. laminated window sections), or even by chipping to be used in the fabrication of alternative building products such as oriented strand board (OSB) or fibreboard. In this manner, end use diversification of a particular wood resource (in this case wood flooring) can be achieved and its useful lifespan extended so as to bring any carbon deficit back into balance and achieve better circularity within the natural carbon cycle.

Summary

Ultimately the level of environmental sustainability that can realistically be achieved through the selection of wood and wood-based flooring depends, in part, on the type of resources and processes involved in making it but, more importantly, on the manner in which it is used over the whole of its life and the time frame during which it can serve a useful purpose. This may or may not involve its incorporation into alternative products whose function differs markedly from that of the original.

Given the pivotal role environmental sustainability has to play in light of our own man-made climatic crisis, today’s producers are eager to make claims of sustainability for commercial advantage which, all too frequently, are themselves ‘unsustainable’ when examined critically. It is not possible to simply brand a product such as wood flooring as ‘sustainable’ without knowing how it will be used, how frequently it will be replaced and, more importantly, how and when it will be integrated into the carbon cycle at the end of its life. n

About the author

Peter Kaczmar Senior Consultant BM TRADA

Further information

To find out more about timber and sustainability, visit www.trada.co.uk/sustainability

Further reading

• WIS 2/3-59 Recovering and minimising wood waste, BM TRADA, 2020

• WIS 4-31 Life cycle costing, BM TRADA, 2019

• www.ukgbc.org/ukgbc-work/net-zero-whole-life-roadmap-forthe-built-environment

• https://woodforgood.com/lifecycle-database

References

1. Daly, H. E., ‘Toward some operational principles of sustainable development’, Ecological Economics, 2:1–6, 1990

Unfinished character B oak flooring

hand-finished with Russwood antique hardwax oil. Photo: Russwood

Express Ebony Oak Flooring. Photo: John Paul Photography

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FSC®F000231

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All the timber we supply has a low carbon footprint without compromising the quality of the timber. Here at Co2 Timber we aim to keep our carbon footprint and that of the products we produce to a minimum and encourage sustainable practices. We use our off cuts in our commercial wood burning stove to heat our workshop in winter and provide heat for our kiln drying process.

We supply to Trade, DIY’s, Contractors, Builders, Manufacturers, Architects. Being a sawmill we offer a bespoke service for all those non standard size planks, boards and cladding and can cut to size and finish as required.

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Let's talk about the wood house effect

Cities are growing, and so are trees. With wood as a construction material, we can bring the forest to the city by building higher, lighter and stronger than ever before. By 2060, global housing needs to double, and emissions need to go down. When using wood as a renewable material that keeps growing back, a truly sustainable future of building is possible. We call this the wood house effect. storaenso.com/WoodHouseEffect

Studio Bark – No Building As Usual

Addressing learning, diversity and the climate emergency through a live build. Tabitha Binding reports.

Photo: Studio Bark

Education Architecture

Afeature on Grand Designs in 2014 led to clients approaching Studio Bark to develop a single-storey eco-home that would meet their accessibility and lifetime needs, and enable planning permission to be obtained on agricultural land in a Herefordshire hamlet.

Could this project become a cross-sector live-build climateliterate summer school with students from across the UK?

Wilf Meynell thought so, ‘We found that we can teach better through a live build rather than within the context of a university […] there’s no point just us as a practice designing (and building) a few eco-homes if we’re not passing on knowledge to the next generation of designers.’

U-Build, developed by Studio Bark and Structure Workshop, is a is totally demountable, expandable, reusable, repairable and recyclable modular system based on CNC-cut plywood panels that click and screw together to form open or closed boxes (cassettes). These boxes are bolted together, insulated, membraned and clad to form ridged frames for studios or homes that can be self-built. Conceived as a low-carbon impact building for the circular economy, the foundations are often concrete free using adjustable foundation systems, such as Jackpads®

Learning via a live build

From more than 120 applications, a diverse group of 12 students, with a balance of ages, backgrounds and skill levels, was selected for the No Building As Usual (NBAU) project.

Ada, Aurora, Gracious, Jay, Kyle, Maria, Matilda, Matt, Mersei, Rose, Salome and Terri-Louise arrived in Herefordshire to build their off-grid camp and ready the site for construction. They stayed for ten weeks, some a little longer, and built Nest House.

I caught up with Terri-Louise, Salome, Gracious and Rose to hear about their experiences.

Terri-Louise Doyle is undergoing her sixth year as a Part 2, MArch Architecture student at Sheffield Hallam University.

‘I applied for NBAU as it aligned with my core values, ethos of sustainability and inclusivity. >>

“These 12 diverse university students from across the UK have added invaluable practical knowledge to their theoretical knowledge and learnt how to build simply and sustainably with timber in a warming climate.”

Education Architecture

I learned about the processes for putting a building together, from start to finish, and how to make intentional choices in my design work to positively impact society and the planet.

‘I enjoyed how theory and practice went hand in hand, allowing for a truly in-depth and pragmatic learning experience. Lewis Taylor from BM TRADA spoke to us about the tolerances that we would need to design in on account of the expansion and shrinking of the material before we prototyped the cladding designs with Douglas fir.

‘Being immersed in the work prompted questions that we wouldn’t usually think to ask and we gained insights from construction professionals across the industry.’

‘My highlights included the physical building, from our camp to Nest House and raising the roof on the lower barn. Experiencing first-hand the actual output from reading a drawing to building from it is incredible; coordinating with the team and external contractors provided a sense of holistic understanding and respect.

‘Living with 11 other people, sharing food, cultural exchanges and experiences, as a team, it felt as if there was nothing we couldn’t accomplish together and we found strength in our differences.

‘Some challenges included rain – scaffolding did not arrive so we had to improvise a large tarpaulin covering to keep the build dry as we built before we could make the house watertight with a breathable membrane.

‘The teaching was really effective; we received training from practising professionals and then applied what we learned to build a modular U-Build house from scratch. This enabled us to retain information more effectively as we physically applied the shared knowledge on the next construction stage.

‘NBAU has firmed up my aspirations to work in harmony with the natural environment, to design better spaces and futures from low-impact, local materials, reducing waste and to work collaboratively with other multifaceted built environment professionals.’

Salome Mulenga is in her first year studying for a BA in Architecture and Landscape at the University of Sheffield.

‘I applied to gain a better understanding of sustainable building design. Through hands-on experience and workshops,

Gracious Muzamhindo has completed Part 1 Architecture at Liverpool John Moore’s University.

‘NBAU was a once-in-a-lifetime opportunity to learn more about using sustainable solutions to design and construct buildings – something I had never heard much about before. Each choice made throughout the build was to minimise the environmental impact of the building. It has significantly impacted how I will design.

‘I learned in depth about how timber can be included in almost every part of a build, and the basics about species, products, moisture, fire and designing for durability and longevity. I led on insulating the roof, building the roof beams, cutting the cladding and on the interior design, but it worked because we were a great team.

‘It has been such an amazing experience to see how every element of a build translates from paper to real life; I enjoyed performing tasks that showed visible progress, especially with

Nest House concept model. Source: Studio Bark

The NBAU students: Standing (left to right) – Jay, Maria, Gracious, Salome, TerriLouise, Rose, Kyle, Matilda. Seated (left to right) – Mersei, Aurora, Matt, Ada.

Photo: Studio Bark

such a supportive group of people. It has affected what I think architecture is and the role I want to play – and given me an appreciation for engineers and construction workers.’

Rose McKiernan is in her second year studying Part 1 Architecture at Queen’s University Belfast.

‘I had no practical experience in construction but was keen to learn about timber and its use in sustainable architecture, work with my peers and with a practice at the forefront of eco design and modern methods of construction.

‘I learnt about using hand tools and power tools and choosing the right fixings; about the properties of timber, its age and moisture content. We used different types of timber and timber products in the construction, and I was able to see which is best for each part of the house.

‘We also constructed our own temporary barn structure using offcuts, sapwood pieces and other materials on site. It was very rewarding to be resourceful and put knowledge into practice.

‘I have benefited immensely from working on each step of the process, from the drawings to the completed home. I’d now like to focus on sustainable architecture, especially finding ways of using materials with less environmental impact and with low embodied carbon.’

End result

These 12 diverse university students from across the UK have added invaluable practical knowledge to their theoretical knowledge and learnt how to build simply and sustainably with timber in a warming climate. n

About the author

Tabitha Binding

Education and Engagement

TRADA

Timber Trade Federation

Timber Development UK

Further information

Studio Bark is an award-winning architectural practice set up in 2014 by Wilf Meynell and Nick Newman to create high-quality, sensitive, environmental design.

The NBAU Programme was sponsored by www.cgluk.com | www.kinrise.com | www.thermafleece.com | www.grimshaw. global | www.makearchitects.com | www.darlingassociates.net | www.ttf.co.uk | www.nmite.ac.uk | www.forbo.co.uk and supported by RIBA, Structure Workshop, TRADA and ACAN.

Week 1 of the live build.

Photo: Studio Bark

Wood Information Sheets (WIS)

Comprising more than 70 specialist documents, these form a comprehensive source of vital information on timber and its use in construction. They are updated on a ‘rolling needs’ basis.

WISs are available to purchase at bookshop.bmtrada.com or bookshop.trada.co.uk

Number Title

TIMBER – GENERAL

WIS 0-14Specifying timber for healthy buildings

WIS 2/3-6Wood decorative and practical

WIS 2/3-10Timbers – their properties and uses

WIS 2/3-28Introducing wood

WIS 2/3-37Softwood sizes

WIS 2/3-56CE marking: implications for timber products

WIS 2/3-58Sustainable timber sourcing

WIS 2/3-59Recovering and minimising wood waste

WIS 2/3-63Modified wood products

WIS 2/3-66Specifying timber species in marine and freshwater construction

WIS 2/3-67Specifying British-grown timbers

WIS 2/3-70 Specifying metals for use with timber

WIS 2/3-72 Carbon and timber in construction for building designers

WIS 4-14Moisture in timber

WIS 4-31Life cycle costing

WIS 4-33Life cycle assessment

TIMBER FRAME CONSTRUCTION

WIS 0-3Introduction to timber frame construction

WIS 0-5Timber frame building: materials specification

WIS 0-10Surveys of timber frame houses

WIS 0-11Improving the thermal performance of existing timber frame buildings

WIS 1-35Breather membranes for timber frame walls

WIS 1-48Sole plates in timber frame construction

WIS 1-49Cladding for timber frame buildings

WIS 2/3-64Timber frame design for flood-prone sites

WIS 2/3-65Principles of green oak construction

WIS 4-15Condensation control in dwellings

WIS 4-30Fire performance of timber frame dwellings

WIS 4-32Acoustic performance in residential timber frame developments

STRUCTURAL USES

WIS 0-1Timber in swimming pool hall construction

WIS 1-6Glued laminated timber

WIS 1-17Structural use of hardwoods

WIS 1-34Assessment and repair of structural timber

WIS 1-37Introduction to Eurocode 5

WIS 1-42Timber I-joists: applications and design

WIS 2/3-31Adhesives for structural use

Number Title

WIS 2/3-36Design of structural timber connections

WIS 2/3-51Timber engineering hardware and connectors

WIS 2/3-52Fasteners for structural timber: nails, screws, dowels and bolts

WIS 2/3-62Cross-laminated timber: structural principles

WIS 2/3-68SIPs: introduction for specifiers

WIS 2/3-69SIPs: structural principles and design

WIS 4-7Timber strength grading and strength classes

WIS 4-22Adhesive-bonded repair systems for structural timber

WIS 4-23Non-destructive testing of timber

FLOORS/ROOFS

WIS 1-10Principles of pitched roof construction

WIS 1-29Trussed rafters

WIS 1-36Timber joist and deck floors – avoiding movement

WIS 1-41Strutting in timber floors

WIS 1-46Decorative timber flooring

PANELS

WIS 2/3-11Specification and use of wood-based panels in exterior situations

WIS 2/3-17Wood-based sheet materials for formwork linings

WIS 2/3-23Introduction to wood-based panel products

WIS 2/3-57Specifying wood-based panels for structural use

WIS 2/3-61Cross-laminated timber: introduction for specifiers

JOINERY

WIS 1-13Performance of fire-resisting timber doorsets

WIS 1-32Upgrading timber doorsets for fire resistance

WIS 1-47Timber external doors

WIS 4-16Timber in joinery

EXTERIOR USES

WIS 0-13Timber in playground equipment

WIS 1-12Timber fencing

WIS 1-31Timber for landscape architecture

WIS 1-50Timber cladding for building refurbishment

WIS 2/3-60Specifying timber exposed to weathering

WIS 2/3-71 Specifying externally exposed timber structures

WIS 4-28Durability by design

PROTECTION

WIS 2/3-1Finishes for external timber

WIS 2/3-16Preservative treatment for timber – a guide to specification

WIS 2/3-32Fungi and insect pests in timber

WIS 4-12Care of timber and wood-based products on building sites

WIS 4-17Insect pests in houses

FIRE

WIS 2/3-3Flame retardant treatments for timber products

WIS 4-11Wood-based panel products and timber in fire

Denotes WISs that are mentioned in the NATIONAL STRUCTURAL TIMBER SPECIFICATION

Publications

The best books on timber design and construction are available from the BM TRADA bookshop

bookshop.bmtrada.com

Timber connections: a guide for engineers

Part 1 – Theory

Timber connections will assist the engineer with connection typology, design detail and the steps involved in verification by calculation. Technical illustrations, calculations and worked examples support the comprehensive textual analysis of the topics and challenges of timber connections. In this first part, the underlying theory of connections is explored.

Designing timber structures: an introduction

An essential primer for those new to designing and engineering with timber. It is written in a clear and engaging style and the book’s notable strength is its full-colour illustrative detail that brings the subject to life.

Site check: The timber frame pocket guide

A concise summary of on-site best practice in timber frame construction. Checklists and illustrations of core activities enable you to verify that work is of the highest standard. Researched and written by experts representing BM TRADA and the STA.

Eurocode 5 span tables 4th edition

Frequently highlighted by Building Control officers, this guide to common span tables (including trimmers) is referenced in building regulations (Approved Document A) and widely used by engineers, building designers and builders.

Timber connections: a guide for engineers

Part 2 – Further topics

Structural timber elements: A prescheme design guide

2nd edition

An at-a-glance reference guide to structural timber options for use during the pre-scheme design process.

National Structural Timber Specification

V2.0

A game-changing publication for timber specifiers. A worked example with a project specification template is also available.

Timber frame construction: 5th edition

The leading manual for professionals on conventional timber frame design and construction methods.

For more information on publications and standards available, visit bookshop.bmtrada.com or contact the bookshop on: +44 (0)1494 569 602 or email bookshop@bmtrada.com

BM TRADA cer tified companies

for the supply of timber products and services

How to use this director y

Specifiers and purchasers can use this directory to find suppliers who have achieved third-party certification through BM TRADA.

• The data in the following directory section is extracted from the BM TRADA certification database and is correct as of 31 December 2021

• A more comprehensive entry for each certified company is maintained in the online database www.bmtrada.com/certified-companies, where users can confirm the latest information on services, scope and certificate information.

• Companies are listed in alphabetical order under each certification scheme.

• The EA number is the European Accreditation code.

• A valid certification mark indicates that the company or individual meets the requirements of the certification scheme.

• For the grading schemes listed, note that the individual grader is certified, not the company.

Sustainable sourcing

BM TRADA also provides chain of custody certification for timber products, but please note that certified companies are listed separately here: https://info.fsc.org/ www.pefc.org/find-certified

BM TRADA Certified companies

MACHINE STRENGTH GRADING

Q-Mark Machine Strength

Grading BS EN 14081-1

EA Code: 6

John Gordon & Son Ltd

Balblair Road, Nairn, Nr Inverness, Scotland IV12 5LT

Contact: Mr Lukasz Kozlowski

Email: Lukasz@gordontimber.co.uk

Tel: 01667 453223

Establishment ID: 005/0347.001

Certificate Number: 5/51

Q-MARK BUILDING SYSTEMS

ETAG 007 Timber Frame Building Kits

EA Code: 28

English Heritage Buildings

Coldharbour Farm Estate, Woods Corner, East Sussex TN21 9LQ

Contact: Mr Steve Adams

Email: Stephen.Adams@ehbp.com

Tel: 01424 838685

Establishment ID: 024/2553

Certificate Number: BSYS-006

Willerby Ltd

Willerby Special Projects, 799 Hedon Road, Hull, East Yorkshire HU9 5NA

Contact: Mr Gary Crosbie

Email: gcrosbie@whh.co.uk

Tel: 01482 707808 Ext 299/Ext 364

Establishment ID: 024/2731

Certificate Number: BSYS-008

ETAG 025

EA Code: 28

Caledonian Modular Ltd

Carlton Works, Ossington Road, Carlton-On-Trent, Newark,NG23 6NT

Contact: Ms Dawn Bromley

Email: dbromley@caledonianmodular.com

Web: www.caledonianmodular.com

Tel: 01636 821645

Establishment ID: 024/8087

Certificate Number: BSYS-001

Q-MARK DOOR BLANK

STD 047

EA Code: 6

Egger (UK) Ltd

Anick Grange Road, Hexham, Northumberland NE46 4JS

Contact: Mr Dan Mather

Email: info@egger.com / dan.mather@egger.com

Web: www.egger.co.uk

Tel: 01434 602191

Establishment ID: 047/10095

Certificate Number: 002

Falcon Panel Products Ltd

Clock House, Station Approach, Shepperton, Middlesex TW17 8AN

Contact: Mr Mark Percival

Email: mpercival@falconpp.co.uk / doortechnical@falconpp.co.uk

Web: www.falconpp.co.uk

Tel: 01932 256580

Establishment ID: 047/11750.CO

Certificate Number: 012

Halspan Ltd

Unit 5, Bilton Road, Hitchin, Hertfordshire SG4 0SB

Contact: Ms Sue Webberley

Email: swebberley@halspan.com / doors@halspan.com

Tel: 01506 827538 / 01279 815285

Establishment ID: 047/11351.10

Certificate Number: 005

Halspan Ltd

Unit 10, M11 Business Link, Parsonage Lane, Stansted, Essex CM24 8GF

Contact: Ms Sue Webberley

Email: swebberley@halspan.com / doors@halspan.com

Tel: 01506 827538 / 01279 815285

Establishment ID: 047/11508.CO

Certificate Number: 005

Q-MARK ENGINEERED WOOD PRODUCTS

ETAG 011 I-Beams

EA Code: 28

James Jones & Sons Ltd: Timber Systems Division

Greshop Industrial Estate, Forres, Morayshire, Scotland IV36 2GW

Contact: Mr Abel Munoz

Email: a.munoz@jamesjones.co.uk

Tel: 01309 671111

Establishment ID: 036/4033.001

Certificate Number: EWP-0001

Metsa Wood UK Ltd

Crossbank Road, King’s Lynn, Norfolk PE30 2HD

Contact: Mr Paul Bell

Email: paul.bell@metsagroup.com

Tel: 01553 732900

Establishment ID: 036/1792

Certificate Number: EWP-003

Staircraft Group Ltd

Colliery Lane North, Bayton Road Industrial Estate, Exhall, Coventry CV7 9NW

Contact: Mr Andrew Hamilton

Email: andy.hamilton@staircraft-ltd.co.uk

Tel: 024 7632 4120

Establishment ID: 036/3448

Certificate Number: 026

Q-MARK ENHANCED SECURITY DOOR

PAS 24:2016 and BS 644:2012 Timber

EA Code: 6

Allan Brothers Ltd

Allan House, Ord Road, Tweedmouth, Berwick Upon Tweed, Northumberland TD15 2XU

Contact: Mr Morten Bach Valstad / Mr Robert Frost

Email: mbv@allanbrothers.co.uk / robert.frost@allanbrothers.co.uk

Web: www.allanbrothers.co.uk

Tel: 01289 334600

Establishment ID: 050/2308

Certificate Number: 094

Benlowe Group Ltd

Park Road, Ratby, Leicester, Leicestershire LE6 0JL

Contact: Mr Derek Murby

Email: derek.murby@benlowe.co.uk

Web: www.benlowe.co.uk

Tel: 0116 238 8914

Establishment ID: 050/14959

Certificate Number: 157

Door-Stop International Ltd

Export Drive, Huthwaite, Nottinghamshire NG17 6AF

Contact: Mr Stephen Upton

Email: supton@masonite.com

Web: www.door-stop.co.uk

Tel: 01623 446336

Establishment ID: 050/10536.Timber

Certificate Number: 335

Doorlining.com Ltd

Unit 6 Lovedere Business Park, Goathurst, Bridgewater, Somerset TA5 2DD

Contact: Mr Lee Morgan

Email: lee.morgan@doorlining.com

Web: www.doorlining.com

Tel: 01278 662933

Establishment ID: 050/19212

Certificate Number: 281

European Wood Products Ltd

t/a European Doorsets

Langley Road, Burscough Industrial Estate, Ormskirk, Lancashire L40 8JR

Contact: Ms Paula Rule / Ms Lyn Farley / Mr Henderson

Email: p.rule@edsi.co.uk / l.farley@edsi.co.uk / m.henderson@edsi.co.uk

Tel: 01704 894999

Establishment ID: 050/1752

Certificate Number: 255

FR Shadbolt & Sons Ltd, t/a Shadbolt International

A J B Woodworking Ltd, 9 Earlstrees Road, Earlstrees Industrial Centre, Corby, Northants NN17 4AZ

Contact: Mr Amarjit Binji

Email: asb@ajb-group.co.uk

Tel: 01536 267139

Establishment ID: 050/0808.01

Certificate Number: 223

GE Door Manufacturing Ltd

Forge Industrial Estate, Maesteg, Nr Bridgend, Mid Glamorgan CF34 0AZ

Contact: Mr Phil Trebble

Email: phil@gedoormanufacturing.co.uk

Web: www.gedoormanufacturing.co.uk

Tel: 01656 730070

Establishment ID: 050/2419

Certificate Number: 328

Gerda Security Products Ltd

18 Fiston Way, Thetford IP24 1HT

Contact: Mr Piotr Zarnoch

Email: pzarnoch@gerdasecurity.co.uk

Web: www.gerdasecurity.co.uk

Tel: 01638 711028

Establishment ID: 050/2318.02

Certificate Number: 051

Gerda Security Products Ltd

54 Chiswick Avenue, Mildenhall, Bury Saint Edmunds, Suffolk IP28 7AY

Contact: Mr Piotr Zarnoch

Email: pzarnoch@gerdasecurity.co.uk / c-dash@gerdasecuirty.co.uk

Web: www.gerdasecurity.co.uk

Tel: 01638 711028

Establishment ID: 050/2318.CO

Certificate Number: 051

Gerda Security Products Ltd

Station Business Park, Station Road, Thetford IP24 2PD

Contact: Mr Piotr Zarnoch

Email: pzarnoch@gerdasecurity.co.uk

Web: www.gerdasecurity.co.uk

Tel: 01638 711028

Establishment ID: 050/2318.03

Certificate Number: 051

Henley Construct

1 Lyon Close, Woburn Road Industrial Estate, Kempston, Bedfordshire MK42 7SB

Contact: Mr Damian Obuchowicz

Email: damian@henleyconstruct.com

Establishment ID: 050/19220

Certificate Number: 298

John Watson Joinery Ltd t/a John Watson High Performance Doorsets

Usworth Road Industrial Estate, Belle Vue Way, Hartlepool TS25 1JZ

Contact: Mr Eddie Watson

Email: eddie.watson@jwdoors.co.uk / sales@jwdoors.co.uk Web: www.johnwatson-joinery.co.uk

Tel: 01429 222023

Establishment ID: 050/5874

Certificate Number: 034

Kingsbury Group PC

Cranborne Industrial Estate, Cranborne Road, Potters Bar EN6 3JN

Contact: Mr Govind Kerai

Email: g.kerai@kingsburygroup.co.uk

Tel: 01707 642279

Establishment ID: 050/17979

Certificate Number: 249

Principal Doorsets Ltd

Riverside Road, Pottington Business Park, Barnstaple, Devon EX31 1NB

Contact: Mr Stan Bond

Email: stan@principaldoorsets.co.uk

Tel: 01237 439152

Establishment ID: 050/16398

Certificate Number: 220

Rowan Manufacturing Ltd

Main Street, Plains, Airdrie, Scotland ML6 7JE

Contact: Mr Billy Cameron

Email: billy.cameron@rowanmanufacturing.co.uk

Web: www.rowan-timber.co.uk

Tel: 01236 814000

Establishment ID: 050/1222. Timber

Certificate Number: 028

Scotdor t/a DorSuite

Roman House, Granitehill Road, Northfield, Aberdeen, Scotland AB16 7AW

Contact: Mr Daryl White

Email: daryl.white@dorsuite.com

Web: www.scotdor.com

Tel: 01355 229966

Establishment ID: 050/17897

Certificate Number: 247

Southern Doors and Cubicles Ltd

Unit 1A, Wyncolls Road, Severalls Industrial Park, Colchester, Essex CO4 9HU

Contact: Mr Darren Watson

Email: darren.watson@sdconline.co.uk

Tel: 01206 222080

Establishment ID: 050/17544

Certificate Number: 225

Winkhaus (UK) Ltd

2950 Kettering Parkway, Kettering, Northants NN15 6XZ

Contact: Mr Chris Flaherty

Email: chris.flaherty@winkhaus.co.uk

Tel: 01536 316000

Establishment ID: 050/17023

Certificate Number: 259

Woodmarque Ltd

16 Mullaghbane Road, Dungannon, Co Tyrone, Northern Ireland BT70 1SR

Contact: Mr Ronan Quinn

Email: ronan.quinn@woodmarque.co.uk

Tel: 028 8772 4907

Establishment ID: 050/17663

Certificate Number: 248

PAS 24:2016 and BS 644:2012 Timber

EA Code: 14

ABL Doors & Windows Ltd

Unit 2, Lancaster Way, Earls Colne, Colchester, Essex CO6 2NS

Contact: Mr Andy Williams

Email: andy@abldoors.co.uk

Web: www.abldoors.co.uk

Tel: 01787 220485

Establishment ID: 050/16103

Certificate Number: 316

Ahmarra Ltd Incorporating Ahmarra Door Solutions Ltd, Ahmarra Door Installations Ltd, Ahmarra Installations Ltd, Doran & Sons Ltd and Doran Asset Management Ltd

Unit 2 Hermitage Park, Harts Farm Way, Havant, Hampshire PO9 1FA

Contact: Ms Vicki Boulton

Email: vicki.boulton@ahmarra.co.uk

Web: www.ahmarra.co.uk

Tel: 023 9238 9076

Establishment ID: 050/1618

Certificate Number: 156

Arnold Laver & Co Ltd

Arnold Laver, Oxclose Park Road North, Sheffield, South Yorkshire S20 8GN

Contact: Mr David Hallam

Email: davidhallam@inteldoors.co.uk

Tel: 0113 270 4086

Establishment ID: 050/15332.CO

Certificate Number: 266

Arnold Laver & Co Ltd

Robson Avenue, Teeside Industrial Estate, Thornaby, Stockton on Tees TS17 9LS

Contact: Mr David Hallam

Email: david.hallam@inteldoors.co.uk / david.hallam@laver.co.uk

Tel: 01642 753284

Establishment ID: 050/15332.02

Certificate Number: 266

Bairds Windows Ltd

1 Slaughterhouse Road, Creeside Industrial Estate, Newton Stewart, Dumfries DG8 6JY

Contact: Mr Malcom Baird

Email: office@bairdswindows.co.uk

Tel: 01671 402737

Establishment ID: 050/15694

Certificate Number: 176

Beamfast Ltd t/a Secure Fire Doors and t/a Security Fire Doors

Units F, H & I, Forest Industrial Park, Forest Road, Hainault, Essex IG6 3HL

Contact: Mr Jaswinder Nandra / Mr Jagjit Nandra

Email: jas.nandra@beamfast.co.uk / jagjit.nandra@beamfast.co.uk

Web: www.beamfast.co.uk

Tel: 020 8502 7700

Establishment ID: 050/7221

Certificate Number: 333

Bridgman IBC Ltd

Greatham Street, Longhill Industrial Estate (North), Hartlepool, Cleveland TS25 1PU

Contact: Mr Stewart Hind

Email: s.hind@bridgman-ibc.com

Tel: 01429 221111

Establishment ID: 050/2076

Certificate Number: 301

Caledonian Plywood Company Ltd

Unit 16 Inter City Way, Bramley, Leeds LS13 4LY

Contact: Mr Jon Plummer

Email: jon@cpcply.co.uk

Tel: 0113 236 1666

Establishment ID: 050/11335

Certificate Number: 324

CCG (Manufacturing) Ltd

1 Cambuslang Road, Cambuslang Investment Park, Glasgow, Scotland G32 8NB

Contact: Mr John Paton

Email: jpaton@c-c-g.co.uk

Tel: 0141 643 3733

Establishment ID: 050/14199

Certificate Number: 138

Central Doorset Manufacturing Ltd

Unit 1 Mill Hill, North West Industrial Estate, Peterlee, SR8 2HR

Contact: Mr Martyn Sandison

Email: martyn@central-manufacturing.co.uk

Tel: 0191 521 4051

Establishment ID: 050/19594

Certificate Number: 343

Complete Doorset Solutions

Unit 10, Dyffryn Industrial Estate, Pool Road, Newtown, Powys SY16 3BD

Contact: Mrs Giverny Allen-Raftery

Email: giv@completedoorsetsolutions.com

Tel: 01293 787280

Establishment ID: 050/18164

Certificate Number: 286

Concept Doors Ltd

Pegrams Road, Harlow, Essex CM18 7PT

Contact: Mr Matt Parker

Email: mp@conceptdoors.net

Web: www.conceptdoors.net

Tel: 01279 780201

Establishment ID: 050/16169

Certificate Number: 178

Cotswold Doors Ltd

Unit 1 Whelford Industrial Estate, Whelford Road, Fairford, Gloucestershire GL7 4DT

Contact: Mr Philip Warner

Email: philwarner@cotswolddoors.com

Web: cotswolddoors.com

Tel: 01285 863222

Establishment ID: 050/19518

Certificate Number: 296

Dorplan Contracts

Bexwell House, Karoo Close, Bexwell Business Park, Downham Market, Norfolk PE38 9GA

Contact: Mr Russell Evershed

Email: russell.evershed@dorplan.co.uk

Web: www.dorplan.co.uk

Tel: 01366 386800

Establishment ID: 050/19172

Certificate Number: 290

Dovetail Enterprises (1993) Ltd

Block 5, Dunsinane Avenue, Dundee DD2 3QN

Contact: Mr Scott Merrilees

Email: s.merrilees@dovetailenterprises.co.uk

Tel: 01382 810099

Establishment ID: 050/17379

Certificate Number: 346

E&SW Knowles & Co Ltd Moor Lane Industrial Estate, Perrywell Road, Witton, Birmingham B6 7AT

Contact: Mr Dalvinder Pulah

Email: dalvinder.pulahi@eswknowles.co.uk

Web: www.knowlesdoors.co.uk

Tel: 0121 356 7046

Establishment ID: 050/19488

Certificate Number: 329

Elite Door Solutions Ltd

Unit 2 Carlton Depot, Carlton Industrial Estate, Industry Road, Barnsley, South Yorkshire S71 3PQ

Contact: Mr Lee Agus

Email: lee@elitedoorsolutions.co.uk

Tel: 0333 358 3339

Establishment ID: 050/19180

Certificate Number: 319

Falcon Panel Products Ltd Clock House, Station Approach, Shepperton, Middlesex TW17 8AN

Contact: Mr Neil Harrison

Email: mpercival@falconpp.co.uk / doortechnical@falconpp.co.uk

Web: www.falconpp.co.uk

Tel: 07826 515165

Establishment ID: 050/1605.CO

Certificate Number: 297

Forza Doors Ltd

24a - 24c Star Road Industrial Estate, Star Road, Partridge Green, West Sussex RH13 8RA

Contact: Mr Philip Duckworth

Email: philipduckworth@forza-doors.com

Web: www.forza-doors.com

Tel: 01403 711126

Establishment ID: 050/19050

Certificate Number: 279

Hall & Tawse Joinery

Roman House, Granitehill Road, Northfield, Aberdeen, Scotland AB16 7AW

Contact: Mr Chris Newton / Mr Daryl Whie

Email: chris.newton@hallandtawse.com / daryl.white@dorsuite.com

Web: www.hallandtawse.com

Tel: 01224 392700

Establishment ID: 050/15742

Certificate Number: 169

Hanson and Beard Ltd

Spring Hall Works, Spring Hall Grove, Halifax HX2 0BU

Contact: Mr Steve Loughtman

Email: steve.loughtman@hansonandbeards.co.uk

Web: www.hansonandbeards.co.uk

Tel: 01422 306830

Establishment ID: 050/11363

Certificate Number: 077

Hurst Joinery Projects Ltd

t/a Aynsley Doors

640 Armytage Road, Armytage Road Industrial Estate, Brighouse, West Yorkshire HD6 1PT

Contact: Mr Shaun Carter

Email: shaun.carter@thehurstgroup.co.uk

Tel: 01274 670077

Establishment ID: 050/13076.Timber

Certificate Number: 305

Integrated Doorset Solutions Ltd

Millennium Business Park, Concorde Way, Mansfield, Nottinghamshire NG19 7JZ

Contact: Mr Stephen Hutsby

Email: stephen.hutsby@integrateddoorsets.com

Tel: 07590 910406

Establishment ID: 050/16591

Certificate Number: 300

London Fire Solution Ltd

Unit 9 Moss Lane Industrial Estate, Royton, Oldham, Greater Manchester OL2 6HR

Contact: Mr Jim Hannon

Email: jimhannon@londonfiresolutions.co.uk

Web: www.londonfiresolutions.co.uk

Tel: 020 7732 3771

Establishment ID: 050/12959.03

Certificate Number: 104

London Fire Solution Ltd

Unit 20, Kent Park Industrial Estate, Ruby Street, London SE15 1LR

Contact: Mr Jim Hannon

Email: jimhannon@londonfiresolutions.co.uk

Web: www.londonfiresolutions.co.uk

Tel: 020 7732 3771

Establishment ID: 050/12959.02

Certificate Number: 104

Northern Fire Solutions Ltd

Unit 9 Moss Lane Industrial Estate, Moss Lane, Oldham, Greater Manchester OL2 6HR

Contact: Mr Steve Carter

Email: steve@nfsdoors.com

Tel: 07545 075044

Establishment ID: 050/19389

Certificate Number: 288

O’Kane Woodworking (2010) Ltd

t/a Compass Windows & Doors

13 Hass Road, Blackbog, Dungiven, Co Derry, Northern Ireland BT47 4QH

Contact: Mr Liam McCarney

Email: liam.mccarney@compasswd.com

Web: www.compasswd.com

Tel: 028 7774 1705

Establishment ID: 050/11322.TIMBER

Certificate Number: 193

On Wood Products Ltd

Unit 1 Wealdhall Farm, Canes Lane, North Weald, Epping, Essex CM17 9LD

Contact: Mr Neil Galloway

Email: Sales@on-woodproducts.co.uk / n.galloway@on-woodproducts.co.uk

Tel: 01992 570541

Establishment ID: 050/15769

Certificate Number: 158

Pendle Doors

Anchor Mill, Moss Fold Road, Darwen, Lancashire BB3 0AQ

Contact: Mr Robert Morgan

Email: robert.morgan@pendledoors.co.uk

Tel: 01254 870850

Establishment ID: 050/18908

Certificate Number: 271

Performance Doorset Solutions

Greenvale Business Park, Todmorden Road, Littleborough, Greater Manchester OL15 9AZ

Contact: Mr Ben Davies

Email: bdavies@pdsdoorsets.co.uk

Web: www.pdsdoorsets.co.uk

Tel: 01706 754791

Establishment ID: 050/2251

Certificate Number: 137

Premdor Crosby Ltd

Birthwaite Business Park, Huddersfield Road, Darton, Barnsley, South Yorkshire S75 5JS

Contact: Mr Stephen Upton

Email: supton@Masonite.com

Web: www.Premdor.com

Tel: 0844 209 0008

Establishment ID: 050/1812

Certificate Number: 002

PWIDF Ltd

Unit B24 Langland Park West, Langland Way, Newport, South Wales NP19 4ED

Contact: Mr Paul White

Email: paul@pwidf.co.uk

Tel: 01633 264777

Establishment ID: 050/19965

Certificate Number: 323

RW Joinery Ltd

Unit 26, Mersey Street, Stockport, Cheshire SK1 2HX

Contact: Mr Peter Andrew

Email: peter.andrew@rwjoinery.co.uk

Tel: 0161 480 8722

Establishment ID: 050/6511

Certificate Number: 345

Sentry Doors Ltd

Brooklands Road, Carcroft, Doncaster DN6 7BA

Contact: Mr Ty Aziz

Email: ty@sentrydoors.co.uk

Web: www.sentrydoors.co.uk

Tel: 01302 337473

Establishment ID: 050/11326

Certificate Number: 097

Sheen Projects Ltd

Unit 3 Crigglestone Industrial Estate, High Street, Crigglestone, Wakefield WF4 3HT

Contact: Mr Carl Sykes

Email: carl@sheenprojects.co.uk

Web: www.sheenprojects.co.uk

Tel: 01924 254466

Establishment ID: 050/15320

Certificate Number: 282

Southern Doors and Cubicles Ltd

Millennium Doors Systems t/a ZMR, MBP House, Spartan Industrial Estate, Brickhouse Lane, Great Bridge B70 0DH

Contact: Mr Darren Watson

Email: darren.watson@sdconline.co.uk

Tel: 01206 222080

Establishment ID: 050/17544.01

Certificate Number: 225

Southern Fire Doors Unit 4,Homeland Farm, Three Legged Cross, Wimborne, Dorset BH21 6QZ

Contact: Mr Tony Ellingworth

Email: paul@southernfiredoors.co.uk / sales@southernfiredoors.co.uk

Tel: 01425 627637

Establishment ID: 050/12229

Certificate Number: 349

Unity Doors Ltd JCK Joinery

8 Heanor Street, Leicester, Leicestershire LE1 4DD

Contact: Ms Emma Heathcote

Email: emma@jckjoinery.co.uk / enquiries@jckjoinery.co.uk

Web: www.jckjoinery.co.uk

Tel: 0116 291 2288

Establishment ID: 050/1918

Certificate Number: 003

Youngs Doors Ltd

Central Road, Cromer, Norfolk NR27 9BW

Contact: Mr Ben Walpole

Email: mail@youngs-doors.co.uk

Tel: 01603 629889

Establishment ID: 050/12133.01

Certificate Number: 299

Youngs Doors Ltd

City Road Works, City Road, Norwich, Norfolk NR1 3AN

Contact: Mr Ben Walpole

Email: mail@youngs-doors.co.uk

Tel: 01603 629889

Establishment ID: 050/12133

Certificate Number: 299

Certified companies

PAS 24:2016 and BS 644:2012 Timber;

PAS 24:2016 and BS 6510:2010 Steel

EA Code: 6

Multi Installations Ltd

502-504 Honeypot Lane, Stanmore, Middlesex HA7 1JR

Contact: Mr Ril Pindoria

Email: ril@multi1.co.uk

Tel: 020 8731 1212

Establishment ID: 050/12971

Certificate Number: 269

Q-MARK ENHANCED SECURITY WINDOW

PAS 24:2016 and BS 644:2012 Timber

EA Code: 6

Allan Brothers Ltd

Allan House, Ord Road, Tweedmouth, Berwick Upon Tweed, Northumberland TD15 2XU

Contact: Mr Morten Bach Valstad / Mr Robert Frost

Email: mbv@allanbrothers.co.uk / robert.frost@allanbrothers.co.uk

Web: www.allanbrothers.co.uk

Tel: 01289 334600

Establishment ID: 031/2308

Certificate Number: 058

Benlowe Group Ltd

Park Road, Ratby, Leicester, Leicestershire LE6 0JL

Contact: Mr Derek Murby

Email: derek.murby@benlowe.co.uk

Web: www.benlowe.co.uk

Tel: 0116 238 8914

Establishment ID: 031/14959

Certificate Number: 132

O’Kane Woodworking (2010) Ltd

t/a Compass Windows & Doors

13 Hass Road, Blackbog, Dungiven, Co Derry, Northern Ireland BT47 4QH

Contact: Mr Liam McCarney

Email: liam.mccarney@compasswd.com

Web: www.compasswd.com

Tel: 028 7774 1705

Establishment ID: 031/11322.TIMBER

Certificate Number: 168

PAS 24:2016 and BS 644:2012 Timber

EA Code: 14

Bairds Windows Ltd

1 Slaughterhouse Road, Creeside Industrial Estate, Newton Stewart, Dumfries DG8 6JY

Contact: Mr Malcolm Baird

Email: office@bairdswindows.co.uk

Tel: 01671 402737

Establishment ID: 031/15694

Certificate Number: 131

Q-MARK FIRE DOOR MANUFACTURE

STD 006

EA Code: 6

ABL Doors & Windows Ltd

Unit 2, Lancaster Way, Earls Colne, Colchester, Essex CO6 2NS

Contact: Mr Andy Williams

Email: andy@abldoors.co.uk

Web: www.abldoors.co.uk

Tel: 01787 220485

Establishment ID: 006/16103

Certificate Number: 1740

Acorn Doorsets Ltd

Unit B2, Wardley Industrial Estate, Fallons Road, Worsley, Manchester M28 2NY

Contact: Mr Paul Bowes

Email: paulbowes@acorndoorsets.com

Web: www.acorntimber.com

Tel: 0161 914 5552

Establishment ID: 006/16884

Certificate Number: 872

ADCAS (1997) Ltd

Unit 12a, Park View Road West, Park View Industrial Estate, Hartlepool, Cleveland TS25 1PG

Contact: Mr Colin Keightley

Email: colin@adcas1997.co.uk

Web: www.adcas1997.co.uk

Tel: 01429 283212

Establishment ID: 006/1640

Certificate Number: 022

Advanced Timber Systems

Oakwood Farm, Tanhouse Lane, Botley, Southampton SO30 2SZ

Contact: Mr Alistair Potts

Email: alistair@advancedtimberuk.com

Tel: 01489 799508

Establishment ID: 006/14534

Certificate Number: 737

Ahmarra Ltd Incorporating Ahmarra Door Solutions Ltd, Ahmarra Door Installations Ltd, Ahmarra Installations Ltd, Doran & Sons Ltd and Doran Asset Management Ltd

Unit 2 Hermitage Park, Harts Farm Way, Havant, Hampshire PO9 1FA

Contact: Ms Vicki Boulton

Email: vicki.boulton@ahmarra.co.uk

Web: www.ahmarra.co.uk

Tel: 023 9238 9076

Establishment ID: 006/1618

Certificate Number: 033

Aspire UK Interiors Ltd

Unit 4 Valley Mills, Southfield Street, Nelson, Lancashire BB9 0LD

Contact: Mr Tony Garnett

Email: tony@aspireukinteriors.co.uk

Web: www.aspireukinteriors.co.uk

Tel: 01282 881503

Establishment ID: 006/11912

Certificate Number: 439

Assa Abloy Opening Solutions

21 Ferguson Drive, Knockmore Hill Industrial Park, Lisburn, Lisburn BT28 2EX

Contact: Mr Martin Marron

Email: martin.marron@assaabloy.com

Web: www.assaabloy.com

Tel: 07880 784944

Establishment ID: 006/19534

Certificate Number: 1514

B Batch Shopfitters Ltd

2025 Spring Bank West, Hull, North Humberside HU5 5EP

Contact: Mr Paul Windross

Email: paul.windross@bbatchgroup.com

Web: www.bbatchgroup.com

Tel: 01482 506903

Establishment ID: 006/10073

Certificate Number: 276

Beamfast Ltd

t/a Secure Fire Doors and t/a Security Fire Doors

Units F, H & I, Forest Industrial Park, Forest Road, Hainault, Essex IG6 3HL

Contact: Mr Jaswinder Nandra / Mr Jagjit Nandra

Email: jas.nandra@beamfast.co.uk / jagjit.nandra@beamfast.co.uk

Web: www.beamfast.co.uk

Tel: 020 8502 7700

Establishment ID: 006/7221

Certificate Number: 083

Bellsure

46 Buckland Road, Penmill Trading Estate, Yeovil, Somerset BA21 5EL

Contact: Mr Chris Brown

Email: chris.brown@bellsure.co.uk

Web: www.bellsure.co.uk

Tel: 01730 719292

Establishment ID: 006/19834

Certificate Number: 2117

Bespoke Complete Services Ltd

Construction House, Unit 4, Olive Lane, Darwen, Lancashire BB3 3DJ

Contact: Mr Lee R McMahon

Email: sales@bcs-l.com

Tel: 01254 777142

Establishment ID: 006/17171

Certificate Number: 941

Birmingham Joinery Ltd

Unit 4, Small Heath Business Park, Talbot Way, Birmingham, Small Heath B10 0HJ

Contact: Mr Ian Sabin

Email: Ian@birminghamjoinery.com

Web: www.birminghamjoinery.com

Tel: 0121 772 8683

Establishment ID: 006/15204

Certificate Number: 746

Bridgman IBC Ltd

Greatham Street, Longhill Industrial Estate (North), Hartlepool, Cleveland TS25 1PU

Contact: Mr Neil Scott

Email: sales@bridgman-ibc.com / n.scott@bridgman-ibc.com

Web: www.bridgman-ibc.com

Tel: 01429 221111

Establishment ID: 006/2076

Certificate Number: 008

C W Fields & Son Ltd

Station Road Industrial Estate, Epworth, Nr Doncaster, South Yorkshire DN9 1JZ

Contact: Ms Francesca Dalla-Riva

Email: francesca@cwfields.co.uk

Web: www.cwfields.co.uk

Tel: 01427 872368

Establishment ID: 006/1528

Certificate Number: 017

Caledonian Plywood Company Ltd

1 Cardowan Park, Tannochside Park, Uddingston, Scotland G71 5PF

Contact: Mr Derrick Bartlett

Email: derrickb@cpcply.co.uk

Web: www.caledonianplywood.com

Tel: 01698 811666

Establishment ID: 006/4585

Certificate Number: 034

Caledonian Plywood Company Ltd

Unit 16 Inter City Way, Bramley, Leeds LS13 4LY

Contact: Mr Jon Plummer

Email: jon@cpcply.co.uk

Tel: 0113 236 1666

Establishment ID: 006/11335

Certificate Number: 034

Carve Interiors Ltd

Units 9-11, Ohio Grove, Burslem, Stoke-on-Trent ST6 2BL

Contact: Mr Mick Frain

Email: mick.frain@carveinteriors.co.uk

Web: www.carveinteriors.co.uk

Tel: 01782 536522 / 822008

Establishment ID: 006/15807

Certificate Number: 815

CCG (Manufacturing) Ltd

1 Cambuslang Road, Cambuslang Investment Park, Glasgow, Scotland G32 8NB

Contact: Mr John Paton

Email: jpaton@c-c-g.co.uk

Tel: 0141 643 3733

Establishment ID: 006/14199

Certificate Number: 687

Central Doorset Manufacturing Ltd

Unit 1 Mill Hill, North West Ind. Est., Peterlee SR8 2HR

Contact: Mr Martyn Sandison

Email: martyn@central-manufacturing.co.uk

Tel: 0191 521 4051

Establishment ID: 006/19594

Certificate Number: 1745

Commercial Door Systems Ltd

Unit 6 Birch Road, Broadmeadow Trade Park, Dumbarton, Scotland G82 2RE

Contact: Mr Michelle Daniels

Email: michelle@Commercialdoorsystems.co.uk

Tel: 01389 298120

Establishment ID: 006/19015

Certificate Number: 1304

Complete Doorset Solutions

Unit 10, Dyffryn Industrial Estate, Pool Road, Newtown, Powys SY16 3BD

Contact: Mrs Giverny Allen-Raftery

Email: giverny.allenraftery@ completedoorsetsolutions.com

Tel: 01293 787280

Establishment ID: 006/18164

Certificate Number: 1090

Concept Doors Ltd

Pegrams Road, Harlow, Essex CM18 7PT

Contact: Mr Lee Harris

Email: LH@conceptdoors.net

Tel: 01279 780201

Establishment ID: 006/16169

Certificate Number: 1563

Conduit Construction Network Ltd (CCN Ltd)

3 Waldridge Way, South Shield, Tyne & Wear NE34 9PZ

Contact: Mr Laurence Maguire / Andrew McNichol

Email: lem@ccn-uk.com

Web: www.ccn-uk.com

Tel: 0191 427 7779

Establishment ID: 006/19083

Certificate Number: 1579

Construction Specialties (UK) Ltd 1010 Westcott Venture Park, Westcott, Aylesbury, Buckinghamshire HP18 0XB

Contact: Mr Ken Barber

Email: ken.barber@c-sgroup.co.uk / enquiries@c-sgroup.co.uk

Tel: 01296 652800

Establishment ID: 006/15048

Certificate Number: 702

Construction Specialties (UK) Ltd Oakwood Farm, Tanhouse Lane, Botley, Southampton SO30 2SZ

Contact: CS: Ken Barber / ATS: Alistair Potts Email: CS: ken.barber@c-sgroup.co.uk; ATS: Alistair@advancedtimberuk.com

Tel: CS: 01296 652800/ ATS: 01489 799508

Establishment ID: 006/15048. Factory 1

Certificate Number: 702

Construction Specialties (UK) Ltd Ovi House, Ratcher Way, Mansfield, Nottingham NG190FS

Contact: CS: Ken Barber / IDSL: Mr Hutsby Email: CS: ken.barber@c-sgroup.co.uk /

IDSL: stephen.hutsby@integrateddoorsets.com

Tel: CS: 0129 665 2800/IDSL: 0116 366 5698

Establishment ID: 006/15048. Factory 2

Certificate Number: 702

Construction Specialties (UK) Ltd Station Works, Bromfield, Nr Ludlow, Shropshire SY8 2BT

Contact: CS: Ken Barber / Hazlin: Christopher Jones Email: CS: ken.barber@c-sgroup.co.uk / Hazlin: sales@hazlin.co.uk

Tel: CS: 01296 652800/Hazlin: 01584 856439

Establishment ID: 006/15048. Factory 4

Certificate Number: 702

Cotswold Doors Ltd

Unit 1 Whelford Industrial Estate, Whelford Road, Fairford, Gloucestershire GL7 4DT

Contact: Mr Philip Warner

Email: philwarner@cotswolddoors.com

Web: cotswolddoors.com

Tel: 01285 863222

Establishment ID: 006/19518

Certificate Number: 1583

FIRE

Wulf Protective manufacture high quality, bespoke fire doors that resist the spread of fire and smoke in a building. We pull together the very best of our range of experience to bring you the highest standard of end-to-end service possible. We’re committed to becoming the leading manufacturer of both high-quality doors and door sets, Certified under Q-Mark.

Our years of experience have taught us that visualising our product is often difficult due to how many bespoke options we are able to offer. Our step-by-step videos on YouTube will help you to understand exactly what your project requires.

We’ll also deliver, install, and maintain your door sets, regardless of the scale of the project.

We are a British manufacturer that means all our timber is responsibly sourced and expertly crafted by our trusted team in West Yorkshire. Whether you need help with specification details on a particular project, glass aperture dimensions or further details on Wulf’s Fire Door Sets – we are here to assist and guide you to fulfil your requirements

Please do not hesitate to contact us with any questions, visit our showroom and subscribe to our YouTube channel!

Speak to our sales team today to discuss your project or enquire further about our bespoke services.

Certified companies

Cotswold Doors Ltd

Unit 4, Farthing Road Ind. Est., Ipswich, Suffolk IP1 5AP

Contact: Mr Philip Warner

Email: philwarner@cotswolddoors.com

Web: cotswolddoors.com

Tel: 01473 240744

Establishment ID: 006/19518.01

Certificate Number: 1583

Derbyshire County Council

Joiners Shop, Prospect Road, Denby, Ripley DE5 8JS

Contact: Mr Sparham

Email: joe.sparham@derbyshire.gov.uk

Tel: 01332 781515

Establishment ID: 006/10225

Certificate Number: 304

Door Solutions Group Ltd

Unit 2, Wortley Court, Fallbank Industrial Estate, Dodworth, Barnsley, South Yorkshire S75 3LS

Contact: Mr Donovan Watkins

Email: info@doorsolutionsgroup.co.uk

Tel: 01226 731359

Establishment ID: 006/18055

Certificate Number: 1038

Doorlining.com Ltd

Unit 6 Lovedere Business Park, Goathurst, Bridgewater, Somerset TA5 2DD

Contact: Mr Lee Morgan

Email: lee.morgan@doorlining.com

Web: www.doorlining.com

Tel: 01278 662933

Establishment ID: 006/19212

Certificate Number: 1380

Dorplan Contracts

Bexwell House, Karoo Close, Bexwell Business Park, Downham Market, Norfolk PE38 9GA

Contact: Mr Russell Evershed

Email: russell.evershed@dorplan.co.uk

Web: www.dorplan.co.uk

Tel: 01366 386800

Establishment ID: 006/19172

Certificate Number: 1554

Dovetail Enterprises (1993) Ltd

Block 5, Dunsinane Avenue, Dundee DD2 3QN

Contact: Mr Charlie Marr

Email: c.marr@dovetailenterprises.co.uk

Tel: 01382 810099

Establishment ID: 006/17379

Certificate Number: 945

E Batty (Contractors) Ltd

t/a Batty Joinery

101 West Dock Street, Hull, East Yorkshire HU3 4HH

Contact: Mr Asghar Hoque

Email: asgharhoque@battyjoinery.co.uk

Web: www.battyjoinery.co.uk

Tel: 01482 326377

Establishment ID: 006/16843

Certificate Number: 924

E&SW Knowles & Co Ltd

Moor Lane Industrial Estate, Perrywell Road, Witton, Birmingham B6 7AT

Contact: Mr Dalvinder Pulah

Email: dalvinder.pulahi@eswknowles.co.uk

Web: www.knowlesdoors.co.uk

Tel: 0121 356 7046

Establishment ID: 006/19488

Certificate Number: 1609

Ecosse Doors Ltd

4 MacDowall Street, Paisley, Scotland PA3 2NB

Contact: Mr Archie McIntyre

Email: archie@ecossedoors.co.uk

Tel: 0141 840 2266

Establishment ID: 006/1660

Certificate Number: 049

EE Smith Contracts Ltd

25 Morris Road, Clarendon Industrial Estate, Leicester, Leicestershire LE2 6AL

Contact: Mr Chris Peel - Mr John Sutcliffe

Email: chris.peel@eesmith.co.uk / john.sutcliffe@eesmith.co.uk

Web: www.eesmith.co.uk

Tel: 0116 270 6946

Establishment ID: 006/19392

Certificate Number: 1459

Egger (UK) Ltd

Anick Grange Rd, Hexham, Northumberland NE46 4JS

Contact: Mr Dan Mather

Email: info@egger.com / dan.mather@egger.com

Web: www.egger.co.uk

Tel: 01434 602191

Establishment ID: 006/10095

Certificate Number: 364

Elite Door Solutions Ltd

Unit 2 Carlton Depot, Carlton Industrial Estate, Industry Road, Barnsley, South Yorkshire S71 3PQ

Contact: Mr Lee Agus

Email: lee@elitedoorsolutions.co.uk

Web: www.elitedoorsolutions.co.uk

Tel: 0333 358 3339

Establishment ID: 006/19180

Certificate Number: 1328

European Wood Products Ltd

t/a European Doorsets

Langley Road, Burscough Industrial Estate, Ormskirk, Lancashire L40 8JR

Contact: Ms Lyn Farley / Mr Paul Bailey / Paula Rule

Email: l.farley@edsi.co.uk / d.ferguson@edsi.co.uk / p.bailey@edsi.co.uk / p.rule@edsi.co.uk

Web: www.edsi.co.uk

Tel: 01704 894999

Establishment ID: 006/1752

Establishment ID: 006/1752.Portugal

Certificate Number: 409

Falcon Panel Products Ltd

Clock House, Station Approach, Shepperton, Middlesex TW17 8AN

Contact: Mr Mark Percival

Email: mpercival@falconpp.co.uk / doortechnical@falconpp.co.uk

Web: www.falconpp.co.uk

Tel: 01932 256580

Establishment ID: 006/1605.CO

Certificate Number: 020

Fit Out (UK) Ltd

27 Abbey Road, Park Royal, London NW10 7SJ

Contact: Mr Gavin Grant

Email: gavingrant@fitoutuk.com

Web: www.fitoutuk.com

Tel: 020 8963 6900

Establishment ID: 006/2401

Certificate Number: 170

Forza Doors Ltd

24a - 24c Star Road Industrial Estate, Star Road, Partridge Green, West Sussex RH13 8RA

Contact: Mr Philip Duckworth

Email: philipduckworth@forza-doors.com

Web: www.forza-doors.com

Tel: 01403 711126

Establishment ID: 006/19050

Certificate Number: 1369

FR Shadbolt & Sons Ltd,

t/a Shadbolt International

7-9 Springwood Drive, Springwood Industrial Estate, Braintree, Essex CM7 2YN

Contact: Ms Emily-Rose Don / Mr Peter McDowall

Email: erd@shadbolt.co.uk / pjm@shadbolt.co.uk

Web: www.shadbolt.co.uk

Tel: 01376 333 376

Establishment ID: 006/0808

Certificate Number: 006

Frontier Joinery Ltd

Unit 191A, Mersey Wharf Business Park, Bromborough, Merseyside CH62 4SF

Contact: Mr Andrew Merriman

Email: andy@frontierdevelopments.co.uk

Tel: 07710 492365

Establishment ID: 006/20061

Certificate Number: 2075

Gariff Construction Ltd

Village House, Eleventh Street, Trafford Park, Manchester M17 1JF

Contact: Mr Tony Cullen

Email: Anthonycullen@gariff.co.uk

Web: www.gariff.co.uk

Tel: 0161 873 0130

Establishment ID: 006/6677

Certificate Number: 055

GE Door Manufacturing Ltd

Forge Industrial Estate, Maesteg, Nr Bridgend, Mid Glamorgan CF34 0AZ

Contact: Mr Philip Trebble

Email: phil@gecarpentry.co.uk

Tel: 01656 812081

Establishment ID: 006/2419

Certificate Number: 181

Gerda Security Products Ltd

18 Fiston Way, Thetford IP24 1HT

Contact: Mr Piotr Zarnoch

Email: pzarnoch@gerdasecurity.co.uk

Web: www.gerdasecurity.co.uk

Tel: 01638 711028

Establishment ID: 006/2318.02

Certificate Number: 227

Gerda Security Products Ltd

54 Chiswick Avenue, Mildenhall, Bury Saint Edmunds, Suffolk IP28 7AY

Contact: Mr Piotr Zarnoch

Email: pzarnoch@gerdasecurity.co.uk / c-dash@gerdasecuirty.co.uk

Web: www.gerdasecurity.co.uk

Tel: 01638 711028

Establishment ID: 006/2318

Certificate Number: 277

Gerda Security Products Ltd

Station Business Park, Station Road, Thetford IP24 2PD

Contact: Mr Piotr Zarnoch

Email: pzarnoch@gerdasecurity.co.uk

Web: www.gerdasecurity.co.uk

Tel: 01638 711028

Establishment ID: 006/2318.03

Certificate Number: 227

Hall & Tawse Joinery

Roman House, Granitehill Road, Northfield, Aberdeen, Scotland AB16 7AW

Contact: Mr Chris Newton / Mr Daryl White

Email: chris.newton@hallandtawse.com / daryl.white@dorsuite.com

Tel: 01224 392700

Establishment ID: 006/15742

Certificate Number: 1073

Halspan Ltd

Unit 5, Bilton Road, Hitchen, Hertfordshire SG4 0SB

Contact: Ms Sue Webberley

Email: swebberley@halspan.com / doors@halspan.com

Tel: 01506 827538 / 01279 815285

Establishment ID: 006/11351.10

Certificate Number: 014

Halspan Ltd

Unit 10, M11 Business Link, Parsonage Lane, Stansted, Essex CM24 8GF

Contact: Ms Sue Webberley

Email: swebberley@halspan.com / doors@halspan.com

Web: www.halspan.com

Tel: 01506 827538 / 01279 815285

Establishment ID: 006/11508.CO

Certificate Number: 014

Hanson and Beard Ltd

Spring Hall Works, Spring Hall Grove, Halifax HX2 0BU

Contact: Mr Steve Loughtman

Email: steve.loughtman@hansonandbeards.co.uk

Web: www.hansonandbeards.co.uk

Tel: 01422 306830

Establishment ID: 006/11363

Certificate Number: 645

Hazlin of Ludlow Ltd

Station Works, Bromfield, Nr Ludlow, Shropshire SY8 2BT

Contact: Mr Christopher Jones

Email: sales@hazlin.co.uk

Tel: 01584 856439

Establishment ID: 006/3652

Certificate Number: 007

Henley Construct

1 Lyon Close, Woburn Road Industrial Estate, Kempston, Bedfordshire MK42 7SB

Contact: Mr Damian Obuchowicz

Email: damian@henleyconstruct.com

Establishment ID: 006/19220

Certificate Number: 1601

Hi-Tec Joinery Products Ltd

26 Tarrington Road, Gloucester, Gloucestershire GL1 4PF

Contact: Mr Ian Matthews

Email: accounts@hi-tecjoinery.uk

Web: www.hi-tecjoinery.org

Tel: 01452 386444

Establishment ID: 006/2139.01

Certificate Number: 222

Hi-Tec Joinery Products Ltd

Unit 3B, Northbrook Road, Gloucester, Gloucestershire GL4 3DP

Contact: Mr Ian Matthews

Email: accounts@hi-tecjoinery.uk

Web: www.hi-tecjoinery.org

Tel: 01452 386444

Establishment ID: 006/2139

Certificate Number: 222

Hurst Joinery Projects Ltd

t/a Aynsley Doors

640 Armytage Road, Armytage Road Industrial Estate, Brighouse, West Yorkshire HD6 1PT

Contact: Mr Richard Corke

Email: richard.corke@thehurstgroup.co.uk

Web: www.thehurstgroup.co.uk

Tel: 01484 723501

Establishment ID: 006/13076

Certificate Number: 557

John Watson Joinery Ltd

t/a John Watson High Performance Doorsets

Usworth Road Industrial Estate, Belle Vue Way, Hartlepool TS25 1JZ

Contact: Mr Eddie Watson

Email: eddie.watson@jwdoors.co.uk / sales@jwdoors.co.uk

Web: www.johnwatson-joinery.co.uk

Tel: 01429 222023

Establishment ID: 006/5874

Certificate Number: 158

JP Corry 648 Springfield Road, Belfast, N. Ireland BT12 7EH

Contact: Mr Chris Collins

Email: chris.collins@jpcorry.co.uk

Web: www.jpcorry.com

Establishment ID: 006/19216

Certificate Number: 1453

KBI Contracts Ltd

Unit 16a Boxer Place, Moss Side Industrial Estate, Leyland, Preston PR26 7QL

Contact: Mr Craig Visser

Email: cnmjoinery@outlook.com

Tel: 07793 131508

Establishment ID: 006/18398

Certificate Number: 1211

Kent Flush Doors and Joinery Ltd

Unit 2, Rose Lane Industrial Estate, Rose Lane, Lenham Heath, Kent ME17 2JN

Contact: Mr Robert Foster

Email: info@kentflushdoors.com

Web: www.kentflushdoors.com

Tel: 01634 712 451

Establishment ID: 006/13396

Certificate Number: 555

Kingsbury Group PC

Cranborne Industrial Estate, Cranborne Road, Potters Bar EN6 3JN

Contact: Mr Govind Kerai

Email: g.kerai@kingsburygroup.co.uk

Tel: 01707 642279

Establishment ID: 006/17979

Certificate Number: 1042

Kingsway Group

Unit 2 Teardrop Centre, London Road, Swanley, Kent BR8 8TS

Contact: Mr Ben Hall

Email: ben.hall@kingswaygroup.co.uk

Web: www.kingswaygroup.co.uk

Tel: 01959 577727

Establishment ID: 006/15399

Certificate Number: 802

London Fire Solution Ltd

Unit 9 Moss Lane Industrial Estate, Royton, Oldham, Greater Manchester OL2 6HR

Contact: Mr Jim Hannon

Email: jimhannon@londonfiresolutions.co.uk

Web: www.londonfiresolutions.co.uk

Tel: 020 7732 3771

Establishment ID: 006/12959.03

Certificate Number: 528

London Fire Solution Ltd

Unit 20, Kent Park Industrial Estate, Ruby Street, London SE15 1LR

Contact: Mr Jim Hannon

Email: jimhannon@londonfiresolutions.co.uk

Web: www.londonfiresolutions.co.uk

Tel: 020 7732 3771

Establishment ID: 006/12959.02

Certificate Number: 528

Meeks Projects Ltd

Blackberry Barn, Hives Lane, North Scarle, Lincoln LN6 9HA

Contact: Mr Benjamin Meeks

Email: benjamin@meeksjoinery.com

Web: https://meeksprojects.com

Tel: 07815 935372

Establishment ID: 006/15161

Certificate Number: 1638

Multi Installations Ltd

502-504 Honeypot Lane, Stanmore, Middlesex HA7 1JR

Contact: Mr Ril Pindoria

Email: ril@multi1.co.uk

Web: www.multi1.co.uk

Tel: 020 8731 1212

Establishment ID: 006/12971

Certificate Number: 1244

O’Kane Woodworking (2010) Ltd

t/a Compass Windows & Doors

13 Hass Road, Blackbog, Dungiven, Co Derry, Northern Ireland BT47 4QH

Contact: Mr Liam McCarney

Email: liam.mccarney@compasswd.com

Web: www.compasswd.com

Tel: 028 7774 1705

Establishment ID: 006/11322

Certificate Number: 1402

Octagon Bespoke Joinery Ltd

Octagon House, 54 Lower Marsh Lane, Kingston, London KT1 3BJ

Contact: Mr Brian Crossingham / Mr Simon Hehir

Email: sales@octagonlimited.co.uk

Web: www.octagonlimited.co.uk

Tel: 020 8942 1111

Establishment ID: 006/16368

Certificate Number: 817

One Stop Joinery Ltd

Caldyne Park, Wallage Lane, Rowfant, Crawley, W. Sussex RH10 4NQ

Contact: Mr Paul Glasgow

Email: info@onestopjoinery.com

Web: www.onestopjoinery.com

Tel: 01293 889693

Establishment ID: 006/7403

Certificate Number: 098

Pandor Ltd

Units F2/F3 London Road Trading Estate, Sittingbourne, Kent ME10 1NQ

Contact: Mr Mike Hill

Email: mike@pandor.ltd

Tel: 020 8279 7611

Establishment ID: 006/16525

Certificate Number: 823

Pendle Doors

Anchor Mill, Moss Fold Road, Darwen, Lancashire BB3 0AQ

Contact: Mr Robert Morgan

Email: robert.morgan@pendledoors.co.uk

Tel: 01254 870850

Establishment ID: 006/18908

Certificate Number: 1255

Performance Doorset Solutions

Greenvale Business Park, Todmorden Road, Littleborough, Greater Manchester OL15 9AZ

Contact: Mr Ben Davies

Email: bdavies@pdsdoorsets.co.uk

Web: www.pdsdoorsets.co.uk

Tel: 01706 754791

Establishment ID: 006/2251

Certificate Number: 240

Prestige Fire Door Services Ltd

Unit 6 Wotton Trading Estate, Wotton Road, Ashford, Kent TN23 6LL

Contact: Mr David Almond

Email: david.almond@sunraydoors.co.uk

Tel: 01252 960399

Establishment ID: 006/17488

Certificate Number: 972

Principal Doorsets Ltd

Riverside Road, Pottington Business Park, Barnstaple, Devon EX31 1NB

Contact: Mr Stan Bond

Email: stan@principaldoorsets.co.uk

Web: www.principal-doorsets.com

Establishment ID: 006/16398

Certificate Number: 821

Public Sector Prison Industries

Post Point 6, 14th Floor, Southern House, Wellesley Grove, Croydon CR0 1XG

Contact: Mr David Anderson

Email: david.anderson@noms.gsi.gov.uk

Tel: 0300 047 5254

Establishment ID: 006/13508

Certificate Number: 627

Rowan Manufacturing Ltd

Main Street, Plains, Airdrie, Scotland ML6 7JE

Contact: Mr Billy Cameron

Email: billy.cameron@rowanmanufacturing.co.uk

Web: www.rowan-timber.co.uk

Tel: 01236 814000

Establishment ID: 006/1222

Certificate Number: 130

Royal Borough Greenwich, Asset Management Birchmere Business Site, Eastern Way, Thamesmead, London SE28 8BF

Contact: Mr Neil Carrick

Email: neil.carrick@royalgreenwich.gov.uk

Tel: 020 8921 6879

Establishment ID: 006/13204

Certificate Number: 591

RW Joinery Ltd

Unit 26, Mersey Street, Stockport, Cheshire SK1 2HX

Contact: Mr Peter Andrew

Email: peter.andrew@rwjoinery.co.uk

Web: www.rwjoinery.co.uk

Tel: 0161 480 8722

Establishment ID: 006/6511

Certificate Number: 051

Scotdor t/a DorSuite

Roman House, Granitehill Road, Northfield, Aberdeen, Scotland AB16 7AW

Contact: Mr Daryl White

Email: daryl.white@scotdor.com

Web: www.scotdor.com

Tel: 01355 229966

Establishment ID: 006/17897

Certificate Number: 1122

Sentry Doors Ltd

Brooklands Road, Carcroft, Doncaster DN6 7BA

Contact: Mr Ty Aziz

Email: ty@sentrydoors.co.uk

Tel: 01302 337473

Establishment ID: 006/11326

Certificate Number: 879

SFD Group Ltd

Unit 2 Scotia Road Business Park, Fitzgerald Way, Tunstall, Stoke-on-Trent ST6 4HG

Contact: Mr Mark Daniels

Email: enquiries@sfd-group.co.uk

Web: www.dancoltd.co.uk

Tel: 01782 880045

Establishment ID: 006/14629

Certificate Number: 677

Sheen Projects Ltd

Unit 3 Crigglestone Industrial Estate, High Street, Crigglestone, Wakefield WF4 3HT

Contact: Mr Carl Sykes

Email: carl@sheenprojects.co.uk

Web: www.sheenprojects.co.uk

Tel: 01924 254466

Establishment ID: 006/15320

Certificate Number: 740

Simpson (York) Ltd

PO Box 289, 10 Hassacarr Close, Chessingham Park, Dunnington York YO19 5SN

Contact: Mr Steve Morrod

Email: joinersshop@simpsonyork.co.uk

Web: www.simpsonyork.co.uk

Tel: 01904 562481 / 07802 641863

Establishment ID: 006/2350

Certificate Number: 154

Southern Fire Doors

Unit 4,Homeland Farm, Three Legged Cross, Wimborne, Dorset BH21 6QZ

Contact: Mr Tony Ellingworth

Email: paul@southernfiredoors.co.uk / sales@southernfiredoors.co.uk

Web: www.southernfiredoors.co.uk

Tel: 01425 627637

Establishment ID: 006/12229

Certificate Number: 907

Specialist Door Solutions

Unit 1 Bordon Trading Estate, Old Station Way, Bordon, Surrey GU35 9HH

Contact: Mr Laurie Ware

Email: laurie@specialistdoorsolutions.com

Tel: 01420 543222

Establishment ID: 006/16449

Certificate Number: 850

Starbank Panel Products Ltd

Sankey Valley Ind. Est., Unit 2 Anglezark Road, Newton-le-Willows, Merseyside WA12 8DJ

Contact: Mr John McCaffrey

Email: john.mccaffrey@starbank-uk.com

Web: www.starbank-uk.com

Tel: 01925 223965

Establishment ID: 006/6684

Certificate Number: 782

STJ Projects Ltd

t/a Scunthorpe Timber & Joinery

Normanby Grange Farmyard, Normanby, North Lincolnshire DN15 9HT

Contact: Mr Lee Cranidge / Mr Mike Pearson

Email: lee@stj.uk.com / mike@stj.uk.com

Web: www.stj.uk.com

Tel: 01724 720977

Establishment ID: 006/16983

Certificate Number: 1652

T Manners and Sons Ltd

Peel House, Dovecot Hill, South Church Enterprise Park, Bishop Auckland, Co Durham DL14 6XW

Contact: Mr Thomas Lowes / Mr Steve Hodges / Mr Wayne Harris

Email: thomas.lowes@tmanners.co.uk / steve.hodges@tmanners.co.uk / wayne.harris@tmanners.co.uk

Tel: 01388 774030

Establishment ID: 006/17961

Certificate Number: 1054

Taylor Made Joinery Interiors Ltd

Manor Wood, Ipswich Road, Bildeston, Ipswich, Suffolk IP7 7BH

Contact: Ms Sarah Mann

Email: smann@tmjinteriors.com

Web: www.taylor-made-joinery.co.uk

Tel: 01449 743305

Establishment ID: 006/3257

Certificate Number: 041

The Community Housing Group Ltd

Oakleaf House, Finepoint Way, Kidderminster, Worcestershire DY11 7FE

Contact: Mr Luke Roberts

Email: luke.roberts@oakleafcs.com

Web: www.oakleafcs.com

Tel: 0800 169 5454

Establishment ID: 006/12777

Certificate Number: 829

Traynor Williams Door Solutions Ltd

9 Loanbank Place, Lanarkshire, Glasgow

Contact: Mrs Gillian Murchie

Email: gillian@tw-ltd.com

Tel: 0141 889 7216

Establishment ID: 006/17952

Certificate Number: 1045

Unit Line Systems Ltd

Fitzgerald Way, Hillbottom Road, Sands Industrial Estate, High Wycombe, Bucks HP12 4HJ

Contact: Mr Phil Chatterton

Email: thomas@unitline.com / Phil@unitline.com

Tel: 01494 440045

Establishment ID: 006/13752

Certificate Number: 592

Unity Doors Ltd JCK Joinery

8 Heanor Street, Leicester, Leicestershire LE1 4DD

Contact: Ms Emma Heathcote

Email: emma@jckjoinery.co.uk / enquiries@jckjoinery.co.uk

Web: www.jckjoinery.co.uk

Tel: 0116 291 2288

Establishment ID: 006/1918

Certificate Number: 675

Winkhaus (UK) Ltd

2950 Kettering Parkway, Kettering, Northants NN15 6XZ

Contact: Mr Chris Flaherty

Email: chris.flaherty@winkhaus.co.uk

Tel: 01536 316000

Establishment ID: 006/17023

Certificate Number: 1131

Woodtech Joinery Ltd

8 Newcomen Road, Skippers Lane Industrial Estate, Middlesbrough, Yorkshire TS6 6PS

Contact: Mr Andrew Simpson

Email: andrew.simpson@woodtechjoinery.co.uk

Web: www.woodtechjoinery.com

Tel: 01642 440666

Establishment ID: 006/19110

Certificate Number: 1738

Youngs Doors Ltd

Central Road, Cromer, Norfolk NR27 9BW

Contact: Mr Adrian Buck

Email: mail@bullenjoinery.co.uk

Tel: 01263 511264

Establishment ID: 006/12133.01

Certificate Number: 1006

Youngs Doors Ltd

City Road Works, City Road, Norwich, Norfolk NR1 3AN

Contact: Mr Ben Walpole

Email: mail@youngs-doors.co.uk

Web: www.youngs-doors.co.uk

Tel: 01603 629889

Establishment ID: 006/12133

Certificate Number: 472

STD 006

EA Code: 14

Arnold Laver & Co Ltd

Arnold Laver, Oxclose Park Road North, Sheffield, South Yorkshire S20 8GN

Contact: Mr David Hallam

Email: davidhallam@inteldoors.co.uk

Tel: 0113 270 4086

Establishment ID: 006/15332.CO

Certificate Number: 792

Arnold Laver & Co Ltd

Robson Avenue, Teeside Industrial Estate, Thornaby, Stockton on Tees TS17 9LS

Contact: Mr David Hallam

Email: david.hallam@inteldoors.co.uk / david.hallam@laver.co.uk

Tel: 01642 753284

Establishment ID: 006/15332.02

Certificate Number: 792

Central Doorset Manufacturing Ltd

Redwells Joinery, 1 Crompton Road, Glenrothes, Scotland KY6 2SF

Contact: Ms Sandra Patterson

Email: sandra@redwellsjoinery.co.uk

Tel: 01592 772010

Establishment ID: 006/19594.01

Certificate Number: 1745

Custom Precision Joinery Ltd

Catheralls Industrial Estate, Brook Hill Way, Buckley, Flintshire CH7 3PS

Contact: Mr Peter Hoyland

Email: peter@cpjoinery.co.uk

Web: www.cpjoinery.co.uk

Tel: 01244 550444

Establishment ID: 006/19979

Certificate Number: 2128

FR Shadbolt & Sons Ltd, t/a Shadbolt International

A J B Woodworking Ltd, 9 Earlstrees Road, Earlstrees Industrial Centre, Corby, Northants NN17 4AZ

Contact: Ms Emily-Rose Don / Mr Peter McDowall

Email: erd@shadbolt.co.uk / pjm@shadbolt.co.uk

Tel: 01536 267139

Establishment ID: 006/0808.01

Certificate Number: 006

Joinery Fixing and Finishing Ltd

Unit P1, London Road Trading Estate, London Road, Sittingbourne, Kent ME10 1NQ

Contact: Mr Chris Tester

Email: chris@joineryfixingandfinishing.com

Web: www.Joineryfixingandfinishing.com

Tel: 01795 429821

Establishment ID: 006/19355

Certificate Number: 1572

Lewis Aldridge Joinery Ltd

Redhouse Industrial Estate, Middlemore Lane, Aldridge, Walsall WS9 8DL

Contact: Mr Paul Lewis

Email: paul.lewis@lewisaldridgejoinery.co.uk

Tel: 01922 455513

Establishment ID: 006/19967

Certificate Number: 2095

Northern Fire Solutions Ltd

Unit 9 Moss Lane Industrial Estate, Moss Lane, Oldham, Greater Manchester OL2 6HR

Contact: Mr Steve Carter

Email: steve@nfsdoors.com

Tel: 07545 075044

Establishment ID: 006/19389

Certificate Number: 1513

On Wood Products Ltd

Unit 1 Wealdhall Farm, Canes Lane, North Weald, Epping, Essex CM17 9LD

Contact: Mr Neil Galloway

Email: Sales@on-woodproducts.co.uk / n.galloway@on-woodproducts.co.uk

Tel: 01992 570541

Establishment ID: 006/15769

Certificate Number: 781

PWIDF Ltd

Unit B24 Langland Park West, Langland Way, Newport, South Wales NP19 4ED

Contact: Mr Paul White

Email: paul@pwidf.co.uk

Tel: 01633 264777

Establishment ID: 006/19965

Certificate Number: 1870

RJ Parry Joinery Ltd

Armstrong House, Minerva Avenue, Chester, Cheshire CH1 4QL

Contact: Ms Joyce Parry

Email: joyce@parryjoinery.co.uk

Web: www.parryjoinery.co.uk

Tel: 01244 371571

Establishment ID: 006/19401

Certificate Number: 1567

The London Fire Door and Carpentry Company Ltd

1 Clipper Court, Clipper Close, Medway City Estate, Rochester, Kent ME2 4QR

Contact: Mr Rob Ellis

Email: rob@lfdcc.co.uk

Tel: 01634 328 291

Establishment ID: 006/18350

Certificate Number: 1631

Wulf Protective Ltd

Pearl House, Commondale Way, Euroway Trading Est., Bradford, Yorkshire BD4 6SF

Contact: Mr Mark Dunn

Email: mark.dunn@wulfprotective.co.uk

Tel: 01274 653100

Establishment ID: 006/20133

Certificate Number: 2045

STD 006

EA Code: 28

Integrated Doorset Solutions Ltd

Millennium Business Park, Concorde Way, Mansfield, Nottinghamshire NG19 7JZ

Contact: Mr Stephen Hutsby

Email: stephen.hutsby@integrateddoorsets.com

Tel: 01623 343111

Establishment ID: 006/16591.01

Certificate Number: 873

Q-MARK TIMBER FRAME ELEMENTS

prEN 14732 Timber Structures

EA Code: 28

Flitcraft Ltd

Tarnacre Hall Business Park, Tarnacre Lane, St Michaels, Preston PR3 0SZ

Contact: Mr Ryan McDermott

Email: ryan@flitcraft.co.uk

Tel: 01995 679444

Establishment ID: 06B/3406

Certificate Number: QTF-010

LoCaL Homes - Part of Accord Housing Association

Airfield Drive, Aldridge, Walsall, West Midlands WS9 0RE

Contact: Miss K’Lee Green

Email: klee.green@greensquareaccord.co.uk

Tel: 0300 111 7002

Establishment ID: 06B/2830

Certificate Number: QTF-003

Roofspace Solutions

Abbey Mills, Birmingham Road, Alcester, Warwickshire B49 5JG

Contact: Mr Paul Terry

Email: paul.terry@roofspacesolutions.co.uk

Web: www.roofspacesolutions.co.uk

Tel: 01789 209006

Establishment ID: 06B/2756

Certificate Number: QTF-005

Saint Gobain - Scotframe Timber Engineering Ltd

4 Grayshill Road, Westfield Industrial Estate, Cumbernauld, Scotland G68 9HQ

Contact: Mr Trevor Norval

Email: trevor.norval@scotframe.co.uk

Establishment ID: 06B/3592

Certificate Number: QTF-008

Saint Gobain - Scotframe Timber Engineering Ltd

Inverurie Business Park, Souterford Avenue, Inverurie, Aberdeenshire, Scotland AB51 0ZJ

Contact: Mr Justin Dumigan

Email: Justin.dumigan@scotframe.co.uk

Tel: 01467 624440

Establishment ID: 06B/3592.01

Certificate Number: QTF-007

Stewart Milne Group Ltd

Falcon House, Curbridge Business Park, Downs Road, Witney, Oxon OX29 7WJ

Contact: Mr Stewart Dalgarno

Email: sdalgarno@stewartmilne.com

Web: www.stewartmilne.com

Tel: 01865 303900

Establishment ID: 06B/19075

Certificate Number: QTF-012

SCAFFOLD BOARD GRADING

BS 2482:2009

EA Code: 6

TRAD Hire & Sales Ltd

TRAD House, Cromwell Road, Bredbury, Stockport SK6 2RF

Contact: Mr Nick Smith

Email: nicksmith@trad.co.uk

Tel: 0161 494 2999

Establishment ID: 007/2696.Smith

Certificate Number: 2696

BS 2482:2009

EA Code: 28

Generation UK Ltd

Trinity Street, Off Tat Bank Road, Oldbury, West Midlands B69 4LA

Contact: Mr Mark Clifford

Email: mark.clifford@altraduk.co.uk

Tel: 0121 543 2950

Establishment ID: 007/2581.Clifford

Establishment ID: 007/2581.Wilkinson

Certificate Number: 2581

TRUSSED RAFTER

Q-Mark Trussed Rafters BS EN 14250

EA Code: 28

David Smith St Ives Ltd

Marley Road, St Ives, Cambridgeshire PE27 3EX

Contact: Mr Tony Maxwell

Email: tonymaxwell@davidsmith.co.uk

Tel: 01480 309909

Establishment ID: 003/0248

Certificate Number: 003/0248

Dover Trussed Roof Company

Shelvin Manor, Shelvin, Canterbury, Kent CT4 6RL

Contact: Mr Darren Moore

Email: darren@dovertruss.co.uk

Web: www.dovertruss.co.uk

Tel: 01303 844303

Establishment ID: 003/0628

Certificate Number: 003/0628

J Scott (Thrapston) Ltd

Bridge Street, Thrapston, Northamptonshire NN14 4LR

Contact: Mr I Foster / Mr Peter Waddup

Email: ianf@scottsofthrapston.co.uk

Tel: 01832 732366

Establishment ID: 003/0934

Certificate Number: 3/934

John B Smith Ltd

Dugdale Street, Stockton On Tees, TS18 2NE

Contact: Mr Alan Dobby

Email: alan.dobby@johnbsmith.co.uk

Tel: 01642 675096

Establishment ID: 003/0631

Certificate Number: 003/631

Nuneaton Roof Truss Ltd

Units 1 & 2 Weddington Terrace, Nuneaton, Warwickshire CV10 0AG

Contact: Mr Scott McEwan

Email: dave@nuneatonrooftruss.co.uk

Tel: 024 7632 7722

Establishment ID: 003/1868

Certificate Number: 3/1868

Pinewood Structures Ltd

The Station, Gamlingay, Nr Sandy, Bedfordshire SG19 3HB

Contact: Mr Nicholas Worboys

Email: nick.worboys@pinewood-structures.co.uk

Tel: 01767 651218

Establishment ID: 003/0626

Certificate Number: 003/626

Read Bros Ltd

Burnett Road, Sweet Briar Road Industrial Estate, Norwich, Norfolk NR3 2BS

Contact: Mr Matthew Read

Email: matt@readbrothers.co.uk

Tel: 01603 401319

Establishment ID: 003/3980

Certificate Number: 3/3980

Talbot Timber Ltd

Warrior Way, Waterloo West, Pembroke Dock, Dyfed, Wales SA72 6UB

Contact: Mr Shaun Smith

Email: ssmith@talbottimber.co.uk

Tel: 01646 686480

Establishment ID: 003/3978

Certificate Number: 3/3978

Triad Timber Components Ltd

Unit A, Peter Road, Lancing Business Park, Lancing, West Sussex BN15 8TH

Contact: Mr Darren Moore

Email: darren@triadtimber.co.uk

Tel: 01903 765167

Establishment ID: 003/0629

Certificate Number: 3/629

Truss Form (Midlands)Ltd

Ladfordfields, Seighford, Stafford, Staffordshire ST18 9QE

Contact: Mr Stefan Rypel

Email: midsales@trussform.co.uk

Web: www.trussform.co.uk

Tel: 01785 282833

Establishment ID: 003/3975

Certificate Number: 003/3975

Truss Form Ltd

Hollins Bridge, Burnley Road East, Waterfoot, Rossendale, Lancashire BB4 9JR

Contact: Mr Stefan Rypel

Email: sales@trussform.co.uk

Tel: 01706 212238

Establishment ID: 003/3976

Certificate Number: 003/3976

Truss-Tech Ltd

Park Lane Business Park, Park Lane, Kirkby-in-Ashfield, Nottinghamshire NG17 9LE

Contact: Mr D Smith

Email: trusstech@btconnect.com

Tel: 01623 688480

Establishment ID: 003/3836

Certificate Number: 3836

Walker Nene Truss Co.

Osborne Road, Wisbech, Cambridgeshire PE13 3JS

Contact: Mr David Smith

Email: dave.smith@walkernene.com

Tel: 01945 582215

Establishment ID: 003/0097

Certificate Number: 003/0097

150 YEARS HERITAGE. A MODERN VISION.

‘Regardless of how demanding our specific requirements, the quality of JCK Joinery doors and the level of service they provide from start to finish is just impeccable. Thanks, and keep doing what you do!’

BESPOKE. UNIQUE. HERITAGE.

There are so many words we could use for what we do at JCK Joinery. The bottom line is, when you work with us, we’ll help you realise exactly what you envisaged for your timber door project. Thanks to our talented joinery team we’re able to offer the highest specifications, with dual certification for fire and security. enquiries@jckjoinery.com

jckjoinery.com

English Heritage Buildings started with one man’s fascination with restoring oak frames in the late 70s; leading to the formation of our company and the manufacture of new oak frame buildings in 1990. This ignited a British revival in oak framing and since then we have led the way in oak frame manufacture.

With our dedication to continued improvement in both product quality and the service we provide, we became the first - and still the only

- oak frame manufacturer to achieve Q-Mark certification from BM TRADA. Our Green Oak Building System BSYS-006 is also recognised as a NHBC accepted MMC system.

With our vast experience and understanding of oak framing - carpentry, technical details, weathering and structural requirements - we have been producing oak frame buildings for three decades. From garages to extensions, garden rooms, leisure buildings and stabling, each building

MD,

is tailored and designed to your own specification and exclusively manufactured here in the UK. We deliver both across the country and export around the world. By coupling traditional English craftsmanship with modern manufacturing techniques, we will transform your dream project into a reality. Our precision, attention to detail and unparalleled quality sets us apart from the competition, leaving you with a beautiful and timeless addition to your home.

UKCA MARKING OF RESINBONDED PARTICLE BOARD

BS EN 13986:2004 + A1:2015

EA Code: 28

Norbord Europe Ltd

Station Road, Cowie, Stirlingshire, Scotland FK7 7BQ

Contact: Mr Malcolm Stanger

Email: malcolm.stanger@norbord.net

Tel: 01786 819347

Establishment ID: 139/5902

Certificate Number: 1224-CPR-0011

UKCA MARKING OF STRENGTH GRADED TIMBER

BS EN 14081-1:2005+A1:2011

EA Code: 6

Abbeygate Builders Merchants Ltd

Unit 5, Arkwright Road, Poyle, Heathrow SL3 0HL

Contact: Mr Peter Simons

Email: peter@abbeygate.com

Tel: 020 8567 8903

Establishment ID: 101/1478

Certificate Number: 1224-CPR-0512

Allen & Orr Ltd

Albion Sawmills, Union Walk, Chesterfield, erbyshire S40 4SA

Contact: Mr Graham Ede

Email: martin@allen-orr.co.uk

Web: www.allen-orr.com

Tel: 01246 232426

Establishment ID: 101/1156

Certificate Number: 1224-CPR-0832

Alsford Timber Ltd

Ness Road, Erith, Kent DA8 2LD

Contact: Mr Rick Paget

Email: rick.paget@alsfordtimber.com

Tel: 01322 333088

Establishment ID: 101/0146

Certificate Number: 1224-CPR-0386

AW Champion Ltd Curtis Road Industrial Estate, Dorking, Surrey RH4 1EJ

Contact: Mr Steve Samler

Email: dorking@championtimber.com

Tel: 01306 884418

Establishment ID: 101/3381

Certificate Number: 1224-CPR-1086

Basildon Timber Merchants Ltd

Honywood House, Honywood Road, Basildon, Essex SS14 3EN

Contact: Mr John Cordery

Email: john@basildontimber.com

Tel: 01268 531444

Establishment ID: 101/1123

Certificate Number: 1224-CPR-0490

Capricorn Eco Timber

Unit D, Ladfordfields Industrial Estate, Seighford, Stafford, Staffordshire ST18 9QE

Contact: Mr Roger Arveschoug

Email: r.arveschoug@btinternet.com

Tel: 01785 282307

Establishment ID: 101/2723

Certificate Number: 1224-CPR-0430

Charles Gregory and Sons (Timber) Ltd

Tansley Sawmills, Nottingham Road, Tansley, Nr Matlock, Derbyshire DE4 5FR

Contact: Mr Richard Gregory

Email: charlesgregoryandsons@unicombox.co.uk

Tel: 01629 582376

Establishment ID: 101/1680

Certificate Number: 1224-CPR-0457

Chiltern Timber

Unit DC4 Prologis Park, Maylands Gateway, Blossom Way, Hemel Hempstead, Hertfordshire HP2 4ZB

Contact: Mr Gerry Barton

Email: gerry.barton@chilterntimber.co.uk

Web: www.chilterntimber.co.uk

Tel: 01442 248444

Establishment ID: 101/2343

Certificate Number: 1224-CPR-0834

Christchurch Timber & Trading Ltd

1 Stour Road, Christchurch, Dorset BH23 1PL

Contact: Mr Bill Craig / Mr Alex Rook

Email: alex@christchurchtimber.co.uk

Tel: 01202 483471

Establishment ID: 101/1558

Certificate Number: 1224-CPR-0853

CL Jones

Caernarfon Depot, Cibyn Industrial Estate, Caernarfon, Gwynedd LL55 2BD

Contact: Mr Ron Owens

Email: ronowens@cljonesltd.co.uk

Tel: 01286 676070

Establishment ID: 101/1984

Certificate Number: 1224-CPR-1072

Clarkes Of Walsham Ltd

Walsham Le Willows, Bury St Edmunds, Suffolk IP31 3BA

Contact: Mr Chris Fuller / Mr Andrew Sturgeon

Email: chris.fuller@clarkesofwalsham.co.uk / andrew.sturgeon@clarkesofwalsham.co.uk

Tel: 01359 259259

Establishment ID: 101/0727

Certificate Number: 1224-CPR-0514

Copford Sawmill

Copford Farm, Dern Lane, Waldron, Heathfield, East Sussex TN21 0PN

Contact: Mr Harry Gingell

Tel: 01435 813472

Establishment ID: 101/2759

Certificate Number: 1224-CPR-0473

David Cover & Son Ltd t/a Covers

Chatfields Yard, Cooksbridge, Lewes, East Sussex BN8 4TJ

Contact: Mr Darren Hartshorne

Email: darren.hartshorne@covers.biz

Tel: 01273 476133

Establishment ID: 101/0752

Certificate Number: 1224-CPR-0435

David Cover & Son Ltd t/a Covers

Station Yard, Bognor Regis, West Sussex PO21 1BT

Contact: Mr Paul Allwright / Mr Martin Hazard

Tel: 01243 785141

Establishment ID: 101/2327

Certificate Number: 1224-CPR-0439

David Cover & Son Ltd t/a Covers

Sussex House, Quarry Lane, Chichester, West Sussex PO19 8PE

Contact: Ms Sarah Swinton

Tel: 01243 785141

Establishment ID: 101/0546

Certificate Number: 1224-CPR-0438

David Cover & Son Ltd t/a Covers

Victoria Gardens, Victoria Industrial Estate, Burgess Hill, West Sussex RH15 9NB

Contact: Mr Terry Lace / Mr Derek Taylor

Email: terry.lace@covers.biz

Tel: 01243 791469

Establishment ID: 101/2572

Certificate Number: 1224-CPR-0441

Esgair Timber Company Ltd

Esgair Forest, Pantperthog, Machynlleth, Powys SY20 9AY

Contact: Mr Peter Bottoms

Email: info@esgairtimber.co.uk

Web: www.esgairtimber,co.uk

Tel: 01654 703804

Establishment ID: 101/2758

Certificate Number: 1224-CPR-0781

First Choice Building Supplies Ltd

Middlesex Business Centre, Bridge Road, Southall, Middlesex UB2 4AB

Contact: Mr Gurpreet Lachhar

Email: sales@middlesextimber.co.uk

Web: www.middlesextimber.co.uk

Tel: 020 8571 6866

Establishment ID: 101/2281

Certificate Number: 1224-CPR-0842

G and S Specialist Timber Inc

The Alpaca Centre Ltd, Snuff Mill Lane, Stainton, Penrith, Cumbria CA11 0HA

Contact: Mr Garry Stevenson

Email: info@toolsandtimber.co.uk

Tel: 01768 891445

Establishment ID: 101/2657

Certificate Number: 1224-CPR-0972

G&C Timber & Joinery Ltd

Stephenson Road, Severalls Industrial Park, Colchester, Essex CO4 9QR

Contact: Mr Colin Chaplin

Email: info@gcsoftwoods.com

Web: www.gcsoftwoods.com

Tel: 01206 752555

Establishment ID: 101/1050

Certificate Number: 1224-CPR-0841

GT Morrison Ltd

The Sawmills, 1 Sawmill Close, Felthorpe, Norwich, Norfolk NR10 4BH

Contact: Mr Julian Magnus

Email: gtmorrisonltd@aol.com

Tel: 01603 754223

Establishment ID: 101/2198

Certificate Number: 1224-CPR-0495

Hertfordshire Timber Supplies Ltd

Blackhorse Rd, Letchworth, Hertfordshire SG6 1HB

Contact: Mr Kevin Cox

Email: kevin@hertstimber.co.uk

Tel: 01462 686838

Establishment ID: 101/5821

Certificate Number: 1224-CPR-0394

Homeleigh Timber & Building Supplies

Station Road, Staplehurst, Tonbridge, Kent TN12 0PY

Contact: Mr Louis Jenkins

Email: louis.jenkins@homeleighgroup.co.uk

Tel: 01580 891958

Establishment ID: 101/1960

Certificate Number: 1224-CPR-1088

Hoppings Softwood Products Plc

The Woodyard, Epping Road, Epping, Essex CM16 6TT

Contact: Mr John Rhodes

Email: tonyf@hoppings.co.uk

Tel: 01992 578877

Establishment ID: 101/0307

Certificate Number: 1224-CPR-1045

In Wood Developments Ltd

The Woodlands Centre, Whitesmith, Nr Lewes, East Sussex BN8 6JB

Contact: Mr Peter Black

Email: pete@in-wood.co.uk

Tel: 01825 872 550

Establishment ID: 101/1985

Certificate Number: 1224-CPR-0865

John Gordon & Son Ltd

Balblair Road, Nairn, Nr Inverness, Scotland IV12 5LT

Contact: Mr Lukasz Kozlowski

Email: lukasz@gordontimber.co.uk

Tel: 01667 453223

Establishment ID: 101/0347

Certificate Number: 1224-CPR-0299

Jordan Timber Ltd

Pocket Nook Lane, Lowton, Warrington, Cheshire WA3 1AB

Contact: Mr John Barker

Email: sales@jordantimber.co.uk

Tel: 01942 683060

Establishment ID: 101/1443

Certificate Number: 1224-CPR-0474

Joseph Griggs & Co Ltd

Bristol Road, Gloucester, Gloucestershire GL1 5TD

Contact: Mr Kevin Cox

Email: kevin. cox@josephgriggs.com

Tel: 01452 520346

Establishment ID: 101/0132

Certificate Number: 1224-CPR-0991

KS Timber Ltd

The Timber Yard, Wharf Road, Stanford Le Hope, Essex SS17 0EQ

Contact: Mr David Sorenson / Ms Carol Wager

Email: david@kstimber.co.uk / carol@kstimber.co.uk

Tel: 01375 641624

Establishment ID: 101/2757

Certificate Number: 1224-CPR-0502

Lawsons (Whetstone) Ltd

53 Blundell Street, Camden Town, London N7 9BN

Contact: Mr Garry O’ Sullivan

Tel: 020 7619 6470

Establishment ID: 101/1152.06

Certificate Number: 1224-CPR-0419

Lawsons SE

Lawsons Sidcup, Unit 2, 5 Arches Business Estate, Maidstone Road, Sidcup, Kent DA14 5AE

Contact: Mr Simon Gregory

Email: simon.gregory@lawsons.co.uk

Tel: 020 8312 1902

Establishment ID: 101/1452

Certificate Number: 1224-CPR-0409

Llandre Sawn Wood Ltd

Hundred House, Llandriadod Wells, Powys, Wales LD1 5RS

Contact: Mr Gethin Price

Email: sales@llandresawnwood.co.uk

Tel: 01982 570329

Establishment ID: 101/3445

Certificate Number: 1224-CPR-1114

Marley Ltd

The Old Shipyard, Gainsborough, Linconshire DN21 1NG

Contact: Ms Jenni Forrest

Email: jenni.forrest@marley.co.uk

Tel: 01427 675546

Establishment ID: 101/6283

Certificate Number: 1224-CPR-0740

Melingoed Ltd

Station Road, Newcastle Emlyn, Carmarthenshire SA38 9BX

Contact: Mr J D Davies

Email: melingoedsaw@btconnect.com

Tel: 01239 711070

Establishment ID: 101/1346

Certificate Number: 1224-CPR-1103

MH Southern & Company Ltd

Green Lane Sawmills, Green Lane, Felling, Gateshead, Tyne & Wear NE10 0JS

Contact: Mr Mark Williamson

Email: markw@mhsouthern.co.uk

Tel: 0191 469 8743

Establishment ID: 101/2591

Certificate Number: 1224-CPR-0471

Mid-Sussex Timber Co Ltd

Station Road, Forest Row, Sussex RH18 5EL

Contact: Mr Craig Reeves

Email: craig.reeves@mstc.co.uk

Establishment ID: 101/0145

Certificate Number: 1224-CPR-0145

Morgan & Co (Strood) Ltd

Knight Road, Rochester, Kent ME2 2BA

Contact: Mr Nigel Major

Email: nigel.major@morgantimber.co.uk

Tel: 01634 290909

Establishment ID: 101/0750

Certificate Number: 1224-CPR-0405

Nicks & Co (Timber) Ltd

Canada Wharf, Bristol Road, Gloucester, Gloucestershire GL1 5TE

Contact: Mr Will O’Toole

Email: will@nickstimber.co.uk

Tel: 01452 300159

Establishment ID: 101/0159

Certificate Number: 1224-CPR-0867

Norton Timber

Long Lane, Shepherdswell, Dover, Kent CT15 7LU

Contact: Mr Terry Norton

Email: sales@nortontimber.co.uk

Tel: 01304 832525

Establishment ID: 101/2064

Certificate Number: 1224-CPR-1063

Orlestone Oak Ltd

Orlestone Oak Sawmill, Nickley Wood, Shadoxhurst, Ashford, Kent TN26 1LZ

Contact: Mr Jack Barton

Email: jack@orlestoneoak.co.uk

Tel: 01233 732179

Establishment ID: 101/2707

Certificate Number: 1224-CPR-0513

Percy A Hudson

Borough Sawmills, Northumberland Street, North Shields, Tyne & Wear NE30 1DW

Contact: Mr M A Hudson

Email: mark@percyahudson.co.uk

Tel: 0191 257 5099

Establishment ID: 101/0502

Certificate Number: 1224-CPR-0447

PGR Builders & Timber Merchants Ltd

91-97 Stadium Way, Benfleet, Essex SS7 3BN

Contact: Mr Dan Toomey

Email: dan.toomey@pgrtimber.co.uk

Tel: 01268 777600

Establishment ID: 101/2770

Certificate Number: 1224-CPR-0917

Premier Timber Unit 1 & 2, Cullet Drive, Queensborough, Kent ME11 5JS

Contact: Mr Andy Hayward

Email: premiertimber@aol.com

Tel: 01795 583 111

Establishment ID: 101/1557

Certificate Number: 1224-CPR-0831

Read Bros Ltd Burnett Road, Sweet Briar Road Industrial Estate, Norwich, Norfolk NR3 2BS

Contact: Mr Matthew Read

Email: matt@readbrothers.co.uk

Tel: 01603 401319

Establishment ID: 101/0575

Certificate Number: 1224-CPR-0478

Ridgeons Ltd

Herringswell Sawmills, Kennett Road, Herringswell, Bury St Edmunds IP28 6SS

Contact: Mr Eddie Hart

Email: ehart@ridgeons.net

Tel: 01638 555850

Establishment ID: 101/1052

Certificate Number: 1224-CPR-0454

Rother Valley Group Station Yard, Rolvenden, Cranbrook, Kent TN17 4QZ

Contact: Mr Robin Crispin

Email: robin@rvtimber.com

Tel: 01580 241555

Establishment ID: 101/1155

Certificate Number: 1224-CPR-0372

Rowan Manufacturing Ltd

Main Street, Plains, Airdrie, Scotland ML6 7JE

Contact: Mr Kevin Cahill

Email: kevin.cahill@rowanmanufacturing.co.uk

Tel: 01236 814000

Establishment ID: 101/1222

Certificate Number: 1224-CPR-1100

Scott Partnership

Polebrook Farm, Hever Road, Hever, Kent TN8 7NJ

Contact: Mr Simon Scott

Email: simon@scottimber.co.uk

Tel: 01732 864729

Establishment ID: 101/2704

Certificate Number: 1224-CPR-1096

Smith Bros Timber (East Anglia) Ltd

15 Cooke Road, South Lowestoft Ind. Est., Lowestoft, Suffolk NR33 7NA

Contact: Mr Jason Harness

Email: sales@smiths-timber.co.uk

Tel: 01502 569115

Establishment ID: 101/1525

Certificate Number: 1224-CPR-0516

South London Timber Co. Ltd

Questar Ind.Estate, Unit 236, Fawkes Avenue, Dartford DA1 1JQ

Contact: Mr Edward James

Email: edward@sltimber.co.uk

Tel: 020 7252 8383

Establishment ID: 101/2273

Certificate Number: 1224-CPR-0368

Stamco Ltd

Sussex Turney & Moulding Co Ltd t/a Stamco, Churchfields Mill, Highfield Drive, Churchfields Industrial Estate, St Leonards-on-Sea, East Sussex TN38 9TG

Contact: Mr Ray Reed

Email: ray.reed@stamco.co.uk

Tel: 01424 856800

Establishment ID: 101/1232

Certificate Number: 1224-CPR-0433

Sydenhams Ltd

Forest Road, Newport, Isle of Wight PO30 5YS

Contact: Mr Luke Menniss

Email: luke.menniss@sydenhams.co.uk

Tel: 01983 535187

Establishment ID: 101/1665

Certificate Number: 1224-CPR-0886

T Brewer & Co Ltd

Timber Mill Way, Gauden Road, Clapham, London SW4 6LY

Contact: Mr Roger Stevens

Email: sales@tbrewer.co.uk

Tel: 020 7720 9494

Establishment ID: 101/1262

Certificate Number: 1224-CPR-0880

Talbot Timber Ltd

Warrior Way, Waterloo West, Pembroke Dock, Dyfed, Wales SA72 6UB

Contact: Mr Shaun Smith

Email: ssmith@talbottimber.co.uk

Establishment ID: 101/1323

Certificate Number: 1224-CPR-0801

The Southern Timber Company Crokers Park, Edgelands Cross, Totnes Road, Ipplepen, Newton Abbot TQ12 5UG

Contact: Mr Andy Fewings

Email: andy@southern-timber.co.uk

Tel: 01803 813803 / 01752 600066

Establishment ID: 101/2080

Certificate Number: 1224-CPR-0500

The Timber Group Unit 3, Aerodrome Estate, Detling, Maidstone, Kent ME14 3HU

Contact: Mr Ian Ausher

Email: ian.ausher@thetimbergroup.co.uk

Tel: 01622 738246

Establishment ID: 101/1970

Certificate Number: 1224-CPR-0505

Thorogood Timber Ltd t/a Thorogoods

Colchester Road, Ardleigh, Colchester, Essex CO7 7PQ

Contact: Mr Peter Thorogood

Email: peter@thorogood.co.uk

Tel: 01206 233100

Establishment ID: 101/1114

Certificate Number: 1224-CPR-0499

Timb-A-Haul Ltd

The Sawmills, Brick Kiln Road, Hevingham, Norfolk NR10 5NN

Contact: Mr Peter Clark

Email: timbahaul@btconnect.com

Tel: 01603 754781

Establishment ID: 101/2303

Certificate Number: 1224-CPR-0829

Timberpride Ltd

Quercus Road, TETBURY, Gloucestershire GL8 8GX

Contact: Mr Alexander Golesworthy

Email: alec@timberpride.co.uk

Tel: 01666 504436

Establishment ID: 101/3300

Certificate Number: 1224-CPR-0889

Trace Remedial Building Services

Unit 7, Graphite Way, Hadfield, Glossop, Derbyshire SK13 1QH

Contact: Mr David Hockey

Email: david.hockey@traceremedial.co.uk

Tel: 01457 865165

Establishment ID: 101/2728

Certificate Number: 1224-CPR-0384

Travis Perkins Trading Co. Ltd.

Baltic Wharf, Boyn Valley Road, Maidenhead, Berkshire SL6 4EE

Contact: Mr Mark Wright

Email: julie.currington@travisperkins.co.uk

Tel: 01628 770577

Establishment ID: 101/0230

Certificate Number: 1224-CPR-0480

Travis Perkins Trading Co. Ltd.

Forstal Road, Aylesford, Maidstone, Kent ME20 7AG

Contact: Mr Brian Lea

Email: brian.lea@travisperkins.co.uk

Tel: 01622 710111

Establishment ID: 101/0092

Certificate Number: 1224-CPR-0489

Travis Perkins Trading Co. Ltd.

Middlebrook Way, Holt Road, Cromer, Norfolk NR27 9JR

Contact: Mr Rob Castle

Email: julie.currington@travisperkins.co.uk

Tel: 01263 511244

Establishment ID: 101/0112

Certificate Number: 1124-CPR-0470

Travis Perkins Trading Co. Ltd.

Park Lane Sawmills, Park Lane, Finchampstead, Berkshire RG40 4PT

Contact: Mr Michael Chotter-Marsh

Email: m.chotter-marsh@travisperkins.co.uk

Tel: 0118 976 1100

Establishment ID: 101/2353

Certificate Number: 1224-CPR-1118

Wenban-Smith Ltd

14 Newland Road, Worthing, West Sussex BN11 1JT

Contact: Mr Craig Milby

Email: craigm@wenbans.com

Tel: 01903 230311

Establishment ID: 101/5614

Certificate Number: 1224-CPR-0826

White Wood Management

48 Northfield Road, Okehampton, Devon EX20 1BA

Contact: Mr Richard James White

Email: info@whitewoodmanagement.co.uk

Tel: 01837 52011

Establishment ID: 101/2640

Certificate Number: 1224-CPR-0458

Yandle & Sons Ltd

Hurst Works, Martoch, Somerset TA12 6JU

Contact: Mr Alex Pickford-Waugh

Email: alex@yandles.co.uk

Tel: 01935 822207

Establishment ID: 101/3329

Certificate Number: 1224-CPR-1085

Youngs Timber & Builders

Merchants

19-23 Hythe Road, Dymchurch, Romney Marsh, Kent TN29 0LN

Contact: Mr John Levitt

Email: john@youngs-tbm.co.uk

Tel: 01303 875588

Establishment ID: 101/2208

Certificate Number: 1224-CPR-0388

BS EN 14081-1:2005+A1:2011

EA Code: 28

Anglo Norden Forest Products Ltd

Orwell Terminal, Duke Street, Ipswich, Suffolk IP3 0AJ

Contact: Mr Per Christensen

Email: pambarker@anglonorden.co.uk

Tel: 01473 233244

Establishment ID: 101/0945

Certificate Number: 1224-CPR-0930

Anthony Axford Ltd

Atlas Sawmills, King Street, Farnworth, Bolton, Lancashire BL4 7AD

Contact: Mr Paul Thomson

Email: paul@anthonyaxford.co.uk

Tel: 01204 571697

Establishment ID: 101/0781

Certificate Number: 1224-CPR-0432

Arbor Timber & Builders Merchants Ltd

Mill Road, Littleburn Ind. Est, Langley Moor, Durham DH7 8HE

Contact: Mr David Kayll

Email: accounts@arbortimber.co.uk

Tel: 0191 378 2016

Establishment ID: 101/1553

Certificate Number: 1224-CPR-0487

Arnold Laver & Co Ltd

Olympic Sawmills, Oxclose Park Road North, Mosborough, Sheffield S20 8GN

Contact: Mr Andrew Bowler

Email: andrewbowler@laver.co.uk

Tel: 0114 276 4700

Establishment ID: 101/1179

Certificate Number: 1224-CPR-0796

Arnwood Timber Ltd

61 Millbrook Road East, Southampton, Hampshire SO15 1HN

Contact: Mr Robert Arnold

Email: arnwoodtimber@btconnect.com

Tel: 023 8023 2327

Establishment ID: 101/1595

Certificate Number: 1224-CPR-0493

AW Champion Ltd Fircroft Way, Ind. Est., Edenbridge, Kent TN8 6EL

Contact: Mr Steve Samler

Email: ssamler@championtimber.com

Tel: 01732 864328

Establishment ID: 101/0413

Certificate Number: 1224-CPR-0398

Brooks Bros (London) Ltd

Unit 3, Portland Commercial Estate, Ripple Road, Barking, Essex IG11 0TW

Contact: Mr Deano Muir

Email: trade@brookslondon.co.uk

Tel: 020 8591 5300

Establishment ID: 101/0342

Certificate Number: 1224-CPR-0390

Buildbase Ltd

Burrfields Road, Portsmouth, Hampshire PO3 5NA

Contact: Mr Martin Watson

Email: martin.watson@buildbase.co.uk

Tel: 023 9266 9535 / 023 9266 2261

Establishment ID: 101/1045

Certificate Number: 1224-CPR-1050

English Woodlands Timber Ltd

Cocking Sawmills, Cocking, Nr Midhurst, West Sussex GU29 0HS

Contact: Mr C Luffman

Email: chris@englishwoodlandstimber.co.uk

Tel: 01730 816941

Establishment ID: 101/2301

Certificate Number: 1224-CPR-0376

Fleming Buildbase Ltd

Silverburn Place, Bridge Of Don, Aberdeen, Scotland AB23 8EG

Contact: Mr Chris McLean

Email: aberdeen@buildbase.co.uk

Tel: 01224 258200

Establishment ID: 101/0224

Certificate Number: 1224-CPR-0925

BM TRADA Certified companies

Fleming Buildbase Ltd

Wood Street, Grangemouth, Central Region, Scotland FK3 8LH

Contact: Mr David Baird

Email: davie.baird@buildbase.co.uk

Tel: 01324 665444

Establishment ID: 101/0360

Certificate Number: 1224-CPR-0992

Howarth Timber Group Ltd - TTL

Howarth House, Hollow Road, Bury St Edmunds, Suffolk IP32 7QW

Contact: Mr Richard Bettinson

Email: rbettinson@howarth-timber.co.uk

Tel: 01284 772700

Establishment ID: 101/0134

Certificate Number: 1224-CPR-0968

Parker Building Supplies Ltd

Jarvis Brook Goods Yard, Western Road, Crowborough, East Sussex TN6 3DS

Contact: Mr Mark Sumner

Email: crowborough@parkerbs.com

Tel: 01892 667000

Establishment ID: 101/1172

Certificate Number: 1224-CPR-1081

Robert Price (Timber & Roofing Merchants) Ltd

The Wood Yard, Forest Road, TAFFS Well, Cardiff CF15 7YE

Contact: Mr Gwyn Pritchard

Email: gpritchard@robert-price.co.uk

Tel: 029 2081 1681

Establishment ID: 101/0517

Certificate Number: 1224-CPR-1076

Ternex Ltd

The Sawmill, 27 Ayot Green, Welwyn, Herts AL6 9BA

Contact: Mr Vince Nevel

Email: vince@ternex.co.uk

Tel: 01707 324606

Establishment ID: 101/2008

Certificate Number: 1224-CPR-0830

Travis Perkins Trading Co. Ltd.

Navigation Road, Chelmsford, Essex CM2 6HX

Contact: Mr Brian Blackburn

Email: brian.blackburn@travisperkins.co.uk

Tel: 01245 490000

Establishment ID: 101/0107

Certificate Number: 1224-CPR-0488

Whippletree Hardwoods

Milestone Farm, Barley Road, Flint Cross, Nr Royston, Herts SG8 7QD

Contact: Mr Hugh Smart

Email: admin@whippletree.co.uk

Tel: 01763 208966

Establishment ID: 101/2237

Certificate Number: 1224-CPR-0940

UKCA MARKING OF TRUSSED RAFTERS

BS EN 14250:2010

EA Code: 6

Joseph Griggs & Co Ltd

Bristol Road, Gloucester, Gloucestershire GL1 5TD

Contact: Mr Kevin Cox

Email: kevin.cox@josephgriggs.com

Web: www.griggsfortimber.co.uk

Tel: 01452 428587

Establishment ID: 106/0132

Certificate Number: 1224-CPR-0310

BS EN 14250:2010

EA Code: 28

David Smith St Ives Ltd

Marley Road, St Ives, Cambridgeshire PE27 3EX

Contact: Mr Tony Maxwell / Mr Richard Britton

Email: tonymaxwell@davidsmith.co.uk

Tel: 01480 309909

Establishment ID: 106/0248

Certificate Number: 1224-CPR-0270

Dover Trussed Roof Company

Shelvin Manor, Shelvin, Canterbury, Kent CT4 6RL

Contact: Mr Darren Moore

Email: darren@dovertruss.co.uk

Web: www.dovertruss.co.uk

Tel: 01303 844303

Establishment ID: 106/0628

Certificate Number: 1224-CPR-0091

Gibbs Timber Frame Ltd

Colemans Farm, Colemans Lane, Porchfield, Isle of Wight PO30 4LX

Contact: Ms Emma Barry

Email: emma@gibbstimberframe.co.uk

Tel: 01983 522188

Establishment ID: 106/2448

Certificate Number: 1224-CPR-0355

Heywood Timber Engineering

Water Lane, Halifax, West Yorkshire HX3 9HG

Contact: Mr John Saxon

Email: john.saxon@heywoodrooftruss.com

Tel: 01422 331104

Establishment ID: 106/2816

Certificate Number: 1224-CPR-0327

Huws Gray Fitlock Ltd

Unit 13, Llandygai Ind Est, Bangor, Gwynedd LL77 4YH

Contact: Mr Osian Jones

Email: ojones@huwsgray.co.uk

Web: www.huwsgray.co.uk

Tel: 01248 750160

Establishment ID: 106/0105

Certificate Number: 1224-CPR-0345

J Scott (Thrapston) Ltd

Bridge Street, Thrapston, Northamptonshire NN14 4LR

Contact: Mr I Foster / Mr Peter Waddup

Email: ianf@scottsofthrapston.co.uk

Tel: 01832 732366

Establishment ID: 106/0934

Certificate Number: 1224-CPR-0265

Melingoed Ltd

Station Road, Newcastle Emlyn, Carmarthenshire SA38 9BX

Contact: Mr Dylan Davies

Email: melingoedsaw@btconnect.com

Tel: 01239 711070

Establishment ID: 106/1346

Certificate Number: 1224-CPR-0482

Nuneaton Roof Truss Ltd

Units 1 & 2 Weddington Terrace, Nuneaton, Warwickshire CV10 0AG

Contact: Mr Scott McEwan

Email: dave@nuneatonrooftruss.co.uk

Tel: 024 7632 7722

Establishment ID: 106/1868

Certificate Number: 1224-CPR-0263

OFP Timber Framed Homes Ltd

Unit 9 Anson Close, Pysons Road Industrial Estate, Broadstairs, Kent CT10 2YB

Contact: Mr Peter Allen

Email: pete@ofptimberframe.com

Web: www.ofptimberframe.com

Tel: 01304 613298

Establishment ID: 106/2100

Certificate Number: 1224-CPR-1216

Pasquill

3 Dalcross Industrial Estate, Inverness, Scotland IV2 7XB

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01257 264851

Establishment ID: 106/2601

Certificate Number: 1224-CPR-0233

Pasquill

9 Grays Road, Green Elms Trading Estate, Uddingston, Glasgow G71 6ET

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01257 264851

Establishment ID: 106/2602

Certificate Number: 1224-CPR-0240

Pasquill

Cooksland Road, Bodmin, Cornwall PL31 2RH

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01208 75777

Establishment ID: 106/2644

Certificate Number: 1224-CPR-0229

Pasquill

Jawbone Industrial Estate, Wood Lane, Rothwell, Leeds, West Yorkshire LS26 0RS

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01257 264851

Establishment ID: 106/2716

Certificate Number: 1224-CPR-0234

Pasquill

Salfords Industrial Estate, Salbrook Road, Salfords, Redhill, Surrey RH1 5GJ

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01257 264851

Establishment ID: 106/2603

Certificate Number: 1224-CPR-0236

Pasquill

Station Road, Stoney Stanton, Leicester LE9 4LU

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01257 264851

Establishment ID: 106/2006

Certificate Number: 1224-CPR-0235

Pasquill

Westway Road, Alexandra Dock, Newport, Gwent NP20 2WD

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01257 264851

Establishment ID: 106/2517

Certificate Number: 1224-CPR-0237

Pasquill

Wigan Lane, Duxbury, Chorley, Lancashire PR7 4BU

Contact: Ms Lorraine Shrigley

Email: lorraine.shrigley@pasquill.co.uk

Tel: 01257 264851

Establishment ID: 106/0242

Certificate Number: 1224-CPR-0232

Pinewood Structures Ltd

The Station, Gamlingay, Nr Sandy, Bedfordshire SG19 3HB

Contact: Mr Nicholas Worboys / M. Mabe

Email: nick.worboys@pinewood-structures.co.uk

Tel: 01767 651218

Establishment ID: 106/0626

Certificate Number: 1224-CPR-0274

Read Bros Ltd

Burnett Road, Sweet Briar Road Industrial Estate, Norwich, Norfolk NR3 2BS

Contact: Mr Matthew Read

Email: matt@readbrothers.co.uk

Tel: 01603 401319

Establishment ID: 106/3980

Certificate Number: 1224-CPR-0272

Scotts Timber Engineering Ltd

45 Heming Road, Washford Industrial Estate, Redditch B98 0EA

Contact: Mr Ian Foster

Email: ianf@scottsofthrapston.co.uk

Web: www.scottste.co.uk

Tel: 0845 078 0335

Establishment ID: 106/1400

Certificate Number: 1224-CPR-0760

Sevenoaks Modular Ltd

Unit 1, Milland Road Industrial Estate, Neath, Swansea SA11 1NJ

Contact: Mr Julian Thomas

Email: jthomas@somodular.co.uk

Tel: 01639 620240

Establishment ID: 106/2861

Certificate Number: 1224-CPR-0508

Sydenhams Timber Engineering Ltd

Forest Road, Newport, Isle of Wight PO30 5YS

Contact: Mr Luke Menniss

Email: luke.menniss@sydenhams.co.uk

Web: www.sydenhams.co.uk

Tel: 01983 535187

Establishment ID: 106/2099

Certificate Number: 1224-CPR-0523

Tailor Made Designs Ltd

Twyford Road, Rotherwas Ind Est, Hereford, Hereford and Worcester HR2 6JR

Contact: Mr Richard Walker

Email: richard@tailormade-frames.co.uk

Tel: 01432 355046

Establishment ID: 106/2819

Certificate Number: 1224-CPR-0323

Talbot Timber Ltd

Warrior Way, Waterloo West, Pembroke Dock, Dyfed, Wales SA72 6UB

Contact: Mr Shaun Smith

Email: ssmith@talbottimber.co.uk

Tel: 01646 686480

Establishment ID: 106/3978

Certificate Number: 1224-CPR-0302

The Roof Truss Co (Northern) Ltd

2 Rainhill Close, Stephenson Industrial Estate, Washington, Tyne and Wear NE37 3HU

Contact: Mr Kevin Gray

Email: kevin.gray@roof-truss.co.uk

Web: www.roof-truss.co.uk

Tel: 0191 417 9040

Establishment ID: 106/2820

Certificate Number: 1224-CPR-0417

Triad Timber Components Ltd

Unit A, Peter Road, Lancing Business Park, Lancing, West Sussex BN15 8TH

Contact: Mr Darren Moore

Email: darren@triadtimber.co.uk

Tel: 01903 765167

Establishment ID: 106/0629

Certificate Number: 1224-CPR-0198

Truss Form (Midlands)Ltd

Ladfordfields, Seighford, Stafford, Staffordshire ST18 9QE

Contact: Mr Stefan Rypel

Email: midsales@trussform.co.uk

Web: www.trussform.co.uk

Tel: 01785 282833

Establishment ID: 106/3975

Certificate Number: 1224-CPR-0264

Truss Form Ltd

Hollins Bridge, Burnley Road East, Waterfoot, Rossendale, Lancashire BB4 9JR

Contact: Mr Stefan Rypel

Email: sales@trussform.co.uk

Tel: 01706 212238

Establishment ID: 106/3976

Certificate Number: 1224-CPR-0273

Truss-Tech Ltd

Park Lane Business Park, Park Lane, Kirkby-in-Ashfield, Nottinghamshire NG17 9LE

Contact: Mr D Smith

Email: trusstech@btconnect.com

Tel: 01623 688480

Establishment ID: 106/3836

Certificate Number: 1224-CPR-0275

Walker Nene Truss Co.

Osborne Road, Wisbech, Cambridgeshire PE13 3JS

Contact: Mr David Smith

Email: dave.smith@walkernene.com

Tel: 01945 582215

Establishment ID: 106/0097

Certificate Number: 1224-CPR-0271

Certified companies

VISUAL STRENGTH GRADING HARDWOOD

BS 5756:2007 + A1:2011; BS EN 16737

EA Code: 6

English Heritage Buildings

Coldharbour Farm Estate, Woods Corner, East Sussex TN21 9LQ

Contact: Mr Gavin Everton

Email: gavin.everton@ehbp.com

Tel: 01424 838200

Establishment ID: 030/2553.Anley

Establishment ID: 030/2553.Gallacher

Certificate Number: 2553

G and S Specialist Timber Inc

The Alpaca Centre Ltd, Snuff Mill Lane, Stainton, Penrith, Cumbria CA11 0HA

Contact: Mr Garry Stevenson

Email: info@toolsandtimber.co.uk

Tel: 01768 891445

Establishment ID: 030/2657.Stevenson

Certificate Number: 2657

Scott Partnership

Polebrook Farm, Hever Road, Hever, Kent TN8 7NJ

Contact: Mr Simon Scott

Email: simon@scottimber.co.uk

Tel: 01732 864729

Establishment ID: 030/2704.Scott

Certificate Number: 2704

White Wood Management

48 Northfield Road, Okehampton, Devon EX20 1BA

Contact: Mr Jim White

Email: jim@whitewoodmanagement.co.uk

Tel: 01837 52011

Establishment ID: 030/2640.White

Certificate Number: 2640

BS 5756:2007 + A1:2011;

EA Code: 28

Border Hardwood Ltd

BS EN 16737

Units E17 & E18 Wem Industrial Estate, Wem, Shropshire SY4 5SD

Contact: Mr Charlie Bevan-Jones

Email: charlie@borderhardwood.com

Tel: 01939 235550

Establishment ID: 030/1814.Bevan-Jones

Certificate Number: 1814

Copford Sawmill

Copford Farm, Dern Lane, Waldron, Heathfield, East Sussex TN21 0PN

Contact: Mr Harry Gingell

Tel: 01435 813472

Establishment ID: 030/2759.Gingell

Certificate Number: 2759

Duffield Timber

Green Lane, Melmerby, Ripon, North Yorkshire HG4 5JB

Contact: Mr Howard Duffield

Email: mike.hall@duffieldtimber.com

Tel: 01765 640564

Establishment ID: 030/2231.Hall

Establishment ID: 030/2231.Vauvert

Certificate Number: 2231

English Woodlands Timber Ltd

Cocking Sawmills, Cocking, Nr Midhurst, West Sussex GU29 0HS

Contact: Mr C Luffman

Email: chris@englishwoodlandstimber.co.uk

Tel: 01730 816941

Establishment ID: 030/2301.Racey

Certificate Number: 2301

GT Morrison Ltd

The Sawmills, 1 Sawmill Close, Felthorpe, Norwich, Norfolk NR10 4BH

Contact: Mr Julian Magnus

Tel: 01603 754223

Establishment ID: 030/2198.Downing

Establishment ID: 030/2198.Magnus

Certificate Number: 2198

In Wood Developments Ltd

The Woodlands Centre, Whitesmith, Nr Lewes, East Sussex BN8 6JB

Contact: Mr Peter Black

Email: pete@in-wood.co.uk

Tel: 01825 872550

Establishment ID: 030/1985.Black

Certificate Number: 1985

Morgan & Co (Strood) Ltd

Knight Road, Rochester, Kent ME2 2BA

Contact: Mr Nigel Major

Email: nigel.major@morgantimber.co.uk

Tel: 01634 290909

Establishment ID: 030/0750.Palmer

Certificate Number: 0750

Norton Timber

Long Lane, Shepherdswell, Dover, Kent CT15 7LU

Contact: Mr Terry Norton

Email: sales@nortontimber.co.uk

Tel: 01304 832525

Establishment ID: 030/2064.Norton

Certificate Number: 2064

Orlestone Oak Ltd

Orlestone Oak Sawmill, Nickley Wood, Shadoxhurst, Ashford, Kent TN26 1LZ

Contact: Mr Jack Barton

Email: jack@orlestoneoak.co.uk

Tel: 01233 732179

Establishment ID: 030/2707.Mills

Certificate Number: 2707

RYTS Ltd t/a Ryland Forestry

106 Bridge End, Warwick, Warwickshire CV34 6PD

Contact: Mr Terry Beanland

Email: rylandforestry@aol.com

Tel: 01926 843888

Establishment ID: 030/2125.Beanland

Certificate Number: 2125

Ternex Ltd

The Sawmill, 27 Ayot Green, Welwyn, Herts AL6 9BA

Contact: Mr Vince Nevel

Tel: 01707 324606

Establishment ID: 030/2008.Nevel

Certificate Number: 2008

Thorogood Timber Ltd

t/a Thorogoods

Colchester Road, Ardleigh, Colchester, Essex CO7 7PQ

Contact: Mr P Thorogood

Email: peter@thorogood.co.uk

Tel: 01206 233100

Establishment ID: 030/1114.Clarke

Establishment ID: 030/1114.Thorogood

Certificate Number: 1114

Timb-A-Haul Ltd

The Sawmills, Brick Kiln Road, Hevingham, Norfolk NR10 5NN

Contact: Mr Peter Clark

Tel: 01603 754781

Establishment ID: 030/2303.Clark

Establishment ID: 030/2303.Costello

Certificate Number: 2303

Timberpride Ltd

Quercus Road, TETBURY, Gloucestershire GL8 8GX

Contact: Mr Alexander Golesworthy

Email: alec@timberpride.co.uk

Tel: 01666 504436

Establishment ID: 030/3300.Golesworthy

Certificate Number: 030/3300

UK Timber Ltd

The Gas Depot, Weldon Rd, Corby, Northants NN17 5UD

Contact: Mr Christopher Coyle

Tel: 01536 267107

Establishment ID: 030/2708.Coyle

Certificate Number: 2708

Venables Brothers Ltd

Chipnall Sawmill, Cheswardine, Market Drayton TF9 2RB

Contact: Mr Thomas Venables

Email: tom@venbros.co.uk

Web: www.venablesoak.co.uk

Tel: 01630 661775

Establishment ID: 030/18785.Venables

Certificate Number: 18785

Whippletree Hardwoods

Milestone Farm, Barley Road, Flint Cross, Nr Royston, Herts SG8 7QD

Contact: Mr Hugh Smart

Email: admin@whippletree.co.uk

Tel: 01763 208966

Establishment ID: 030/2237.Smart

Establishment ID: 030/2237.Wright

Certificate Number: 2237

Yandle & Sons Ltd

Hurst Works, Martoch, Somerset TA12 6JU

Contact: Mr Alex Pickford-Waugh

Email: alex@yandles.co.uk

Tel: 01935 822207

Establishment ID: 030/3329.Pickford-Waugh

Certificate Number: 3329

VISUAL STRENGTH GRADING SOFTWOOD

BS 4978:2007 + A1:2011

EA Code: 6

Arfon Timber

8 Goronwy St No 2, Gerlan, Bethesda, Bangor LL57 3TT

Contact: Mr Mark Chapman

Email: mark@arfontimber.co.uk

Web: www.arfontimber.co.uk

Tel: 07534 188740

Establishment ID: 004/18978.Chapman

Certificate Number: 18978

Hales Sawmills Ltd

Western Way, Market Drayton, Shropshire TF9 3UY

Contact: Mr J C Parton

Email: julian@halessawmills.co.uk /

sales@halessawmills.co.uk

Web: www.halessawmills.co.uk

Tel: 01630 653359

Establishment ID: 004/2668.Butter

Establishment ID: 004/2668.Hassall

Certificate Number: 2668

White Wood Management

48 Northfield Road, Okehampton, Devon EX20 1BA

Contact: Mr Jim White

Email: jim@whitewoodmanagement.co.uk

Tel: 01837 52011 / 07974 217168

Establishment ID: 004/2640.White

Certificate Number: 2640

BS 4978:2007 + A1:2011

EA Code: 28

Abbeygate Builders Merchants Ltd

Unit 5, Arkwright Road, Poyle, Heathrow SL3 0HL

Contact: Mr Michael Parfitt

Email: michael@abbeygate.com

Tel: 020 8567 8903

Establishment ID: 004/1478.Parfitt

Establishment ID: 004/1478.Simons

Certificate Number: 1478

Adhectic Ltd

Phoenix House, Radley Road Industrial Estate, Abingdon, Oxfordshire OX14 3RY

Contact: Mr Alick Haynes

Email: sales@adhectic.co.uk

Tel: 01235 520738

Establishment ID: 004/1674.Jenkins

Certificate Number: 1674

Allen & Orr Ltd

Albion Sawmills, Union Walk, Chesterfield, Derbyshire S40 4SA

Contact: Mr Graham Ede

Tel: 01246 232859

Establishment ID: 004/1156.Waterhouse

Certificate Number: 1156

Alsford Timber Ltd

Ness Road, Erith, Kent DA8 2LD

Contact: Mr Rick Paget

Email: rick.paget@alsfordtimber.com

Tel: 01322 333088

Establishment ID: 004/0146.Cudmore

Establishment ID: 004/0146.Jones

Establishment ID: 004/0146.Paget

Establishment ID: 004/0146.Peaple

Certificate Number: 0146

Anglo Norden Forest Products Ltd

Orwell Terminal, Duke Street, Ipswich, Suffolk IP3 0AJ

Contact: Mr Per Christensen

Tel: 01473 233244

Establishment ID: 004/0945.Knight

Certificate Number: 0945

Anthony Axford Ltd

Atlas Sawmills, King Street, Farnworth, Bolton, Lancashire BL4 7AD

Contact: Mr Paul Jones

Email: paul@anthonyaxford.co.uk

Tel: 07966 459840

Establishment ID: 004/0781.Jones

Establishment ID: 004/0781.Lee

Certificate Number: 0781

Arbor Timber & Builders Merchants Ltd

Mill Road, Littleburn Ind. Est, Langley Moor, Durham DH7 8HE

Contact: Mr David Kayll

Tel: 0191 378 2016

Establishment ID: 004/1553.Kayll

Certificate Number: 1553

Arnold Laver & Co Ltd

Olympic Sawmills, Oxclose Park Road North, Mosborough, Sheffield S20 8GN

Contact: Mr Andrew Bowler

Email: andrewbowler@laver.co.uk

Tel: 0114 276 4700

Establishment ID: 004/1179.Adams

Certificate Number: 1179

Arnwood Timber Ltd

61 Millbrook Road East, Southampton, Hampshire SO15 1HN

Contact: Mr Robert Arnold

Tel: 023 8023 2327

Establishment ID: 004/1595.Arnold

Certificate Number: 1595

Avon Timber Merchants Ltd

Stonebridge Industrial Estate, Rowley Drive, Coventry CV3 4FG

Contact: Mr Steve Lomasney

Email: s.lomasney@avontimber.co.uk

Tel: 024 7630 4848

Establishment ID: 004/1142.Goalby

Certificate Number: 1142

AW Champion Ltd

Curtis Road Industrial Estate, Dorking, Surrey RH4 1EJ

Contact: Mr Steve Samler

Email: dorking@championtimber.com

Tel: 01306 884418

Establishment ID: 004/3381.Ridland

Certificate Number: 3382

AW Champion Ltd

Fircroft Way, Industrial Estate, Edenbridge, Kent TN8 6EL

Contact: Mr Steve Samler

Email: ssamler@championtimber.com

Tel: 01732 864328

Establishment ID: 004/0413.Samler

Establishment ID: 004/0413.Worley

Certificate Number: 0413

Basildon Timber Merchants Ltd

Honywood House, Honywood Road, Basildon, Essex SS14 3EN

Contact: Mr John Cordery

Email: bastim@ukonline.co.uk

Tel: 01268 531444

Establishment ID: 004/1123.Cordery

Certificate Number: 1123

Brooks Bros (London) Ltd

Unit 3, Portland Commercial Estate, Ripple Road, Barking, Essex IG11 0TW

Contact: Mr Peter Sherriff

Tel: 020 8591 5300

Establishment ID: 004/0342.Muir

Certificate Number: 0342

Buckland Timber

Marsh End, Lords Meadow Industrial Estate, Crediton, Devon EX17 1DN

Contact: Mr Robin Nicholson

Email: info@bucklandtimber.co.uk

Tel: 01363 891363

Establishment ID: 004/2822.Dicks

Establishment ID: 004/2822.Glover

Certificate Number: 2822

Buildbase Ltd

Burrfields Road, Portsmouth, Hampshire PO3 5NA

Contact: Mr Martin Watson

Email: martin.watson@buildbase.co.uk

Tel: 023 9266 9535 / 023 9266 2261

Establishment ID: 004/1045.Wood

Certificate Number: 1045

Capricorn Eco Timber

Unit D, Ladfordfields Industrial Estate, Seighford, Stafford, Staffordshire ST18 9QE

Contact: Mr Roger Arveschoug

Tel: 01785 282307

Establishment ID: 004/2723.Arveschoug

Certificate Number: 2723

Carver Group of Companies

Neachells Lane, Wednesfield, Wolverhampton WV11 3RG

Contact: Mr Brian Warrington

Email: brianwarrington@carvers.co.uk

Tel: 01902 577000

Establishment ID: 004/2045.Watton

Certificate Number: 2045

Charles Gregory and Sons (Timber) Ltd

Tansley Sawmills, Nottingham Road, Tansley, Nr Matlock, Derbyshire DE4 5FR

Contact: Mr Richard Gregory

Email: info@charlesgregoryandsons.co.uk

Tel: 01629 582376

Establishment ID: 004/1680.Gregory

Certificate Number: 1680

Charles Ransford & Son Ltd

Station Street, Bishop’s Castle, Shropshire SY9 5AQ

Contact: Mr Peter Walters

Email: p.walters@ransfords.co.uk

Tel: 01588 638331

Establishment ID: 004/1143.Leitch

Establishment ID: 004/1143.Morgan

Certificate Number: 1143

Chiltern Timber

Unit DC4 Prologis Park, Maylands Gateway, Blossom Way, Hemel Hempstead, Hertfordshire HP2 4ZB

Contact: Mr Gerald Barton

Email: gerry.barton@chilterntimber.co.uk

Tel: 01442 248444

Establishment ID: 004/2343.Barton

Certificate Number: 2343

Christchurch Timber & Trading Ltd

1 Stour Road, Christchurch, Dorset BH23 1PL

Contact: Mr Bill Craig / Mr Alex Rook

Email: alex@christchurchtimber.co.uk

Tel: 01202 483471

Establishment ID: 004/1558.Sims

Certificate Number: 1558

CL Jones

Caernarfon Depot, Cibyn Industrial Estate, Caernarfon, Gwynedd LL55 2BD

Contact: Mr Ron Owens

Email: ronowens@cljonesltd.co.uk

Tel: 01286 676070

Establishment ID: 004/1984.Owens

Certificate Number: 1984

Clarkes Of Walsham Ltd

Walsham Le Willows, Bury St Edmunds, Suffolk IP31 3BA

Contact: Mr Andrew Sturgeon

Email: andrew.sturgeon@clarkesofwalsham.co.uk

Tel: 01359 259259

Establishment ID: 004/0727.Sturgeon

Certificate Number: 0727

David Cover & Son Ltd t/a Covers

110 Norway Road, Hilsea, Portsmouth, Hampshire PO3 5FT

Contact: Mr Dale Lambourne

Tel: 023 9267 1900

Establishment ID: 004/1616.Atkinson

Establishment ID: 004/1616.Tamblyn

Certificate Number: 1616

David Cover & Son Ltd t/a Covers

Chatfields Yard, Cooksbridge, Lewes, East Sussex BN8 4TJ

Contact: Mr Darren Hartshorne

Email: darren.hartshorne@covers.biz

Tel: 01273 476133

Establishment ID: 004/0752.Sandalls

Certificate Number: 0752

David Cover & Son Ltd t/a Covers

Imperial Park, Empress Road, Southampton, Hampshire SO14 0JW

Contact: Ms Rhea Sampson

Email: rhea.sampson@covers.biz

Web: www.covers.biz

Tel: 023 8055 6996

Establishment ID: 004/3262.Bowman

Certificate Number: 5727

David Cover & Son Ltd t/a Covers

Station Yard, Bognor Regis, West Sussex PO21 1BT

Contact: Mr Paul Allwright

Tel: 01243 785141

Establishment ID: 004/2327.Outen

Establishment ID: 004/2327.Sampson

Certificate Number: 2327

David Cover & Son Ltd t/a Covers

Sussex House, Quarry Lane, Chichester, West Sussex PO19 8PE

Contact: Ms Sarah Swinton

Email: sarah.swinton@covers.biz

Tel: 01243 785141

Establishment ID: 004/0546.Bracher

Establishment ID: 004/0546.Clare

Establishment ID: 004/0546.Irish

Establishment ID: 004/0546.Jeal

Establishment ID: 004/0546.Kemish

Certificate Number: 0546

David Cover & Son Ltd t/a Covers

Victoria Gardens, Victoria Industrial Estate, Burgess Hill, West Sussex RH15 9NB

Contact: Mr Terry Lace / Mr Derek Taylor

Email: terry.lace@covers.biz

Tel: 01444 233358

Establishment ID: 004/2572.Lane

Establishment ID: 004/2572.Wakeford

Certificate Number: 2572

Esgair Timber Company Ltd

Esgair Forest, Pantperthog, Machynlleth, Powys SY20 9AY

Contact: Mr Dan Artherton

Email: info@esgairtimber.co.uk

Tel: 01654 703904

Establishment ID: 004/2758.Evans

Certificate Number: 2758

FH Ives Ltd

217 Southend Road, Wickford, Essex SS11 8PG

Contact: Mr N Ives

Tel: 01268 732373

Establishment ID: 004/0313.Logan

Establishment ID: 004/0313.Woolley

Certificate Number: 0313

First Choice Building Supplies Ltd

Middlesex Business Centre, Bridge Road, Southall, Middlesex UB2 4AB

Contact: Mr Gurpreet Lachhar

Email: sales@middlesextimber.co.uk

Web: www.middlesextimber.co.uk

Tel: 020 8571 6866 / 020 8571 7006

Establishment ID: 004/2281.Lachhar

Certificate Number: 2281

Fleming Buildbase Ltd

Silverburn Place, Bridge Of Don, Aberdeen, Scotland AB23 8EG

Contact: Mr Mike MacLellan

Email: aberdeen@buildbase.co.uk

Tel: 01224 258200

Establishment ID: 004/0224.Black

Certificate Number: 0224

Fleming Buildbase Ltd

Wood Street, Grangemouth, Central Region, Scotland FK3 8LH

Contact: Mr David Baird

Email: davie.baird@buildbase.co.uk / grangemouth.admin@buildbase.co.uk

Tel: 01324 665444

Establishment ID: 004/0360.Savage

Certificate Number: 0360

G&C Timber & Joinery Ltd

Stephenson Road, Severalls Industrial Park, Colchester, Essex CO4 9QR

Contact: Mr Colin Chaplin

Email: info@gcsoftwoods.com

Tel: 01206 752555

Establishment ID: 004/1050.Chaplin

Certificate Number: 1050

Hertfordshire Timber Supplies Ltd

Blackhorse Rd, Letchworth, Hertfordshire SG6 1HB

Contact: Mr Kevin Cox

Email: kevin@hertstimber.co.uk

Tel: 01462 686838

Establishment ID: 004/5821.Barnes

Certificate Number: 5821

Homeleigh Timber & Building Supplies

Station Road, Staplehurst, Tonbridge, Kent TN12 0PY

Contact: Mr Louis Jenkins

Email: louis.jenkins@homeleighgroup.co.uk

Tel: 01580 891958

Establishment ID: 004/1960.Jenkins

Certificate Number: 1960

Hoppings Softwood Products Plc

The Woodyard, Epping Road, Epping, Essex CM16 6TT

Contact: Mr John Rhodes

Tel: 01992 578877

Establishment ID: 004/0307.Furlong

Certificate Number: 0307

Howarth Timber Group Ltd - TTL

Howarth House, Hollow Road, Bury St Edmunds, Suffolk IP32 7QW

Contact: Mr Richard Bettinson

Email: rbettinson@howarth-timber.co.uk

Tel: 01284 772700

Establishment ID: 004/0134.Butcher

Certificate Number: 0134

Huws Gray Fitlock Ltd

Llangefni Industrial Estate, Bridge Street, Llangefni, Anglesey, Gwynedd, Wales LL77 7JA

Contact: Mr David O Williams

Tel: 01248 421956

Establishment ID: 004/0105.EWilliams

Establishment ID: 004/0105.Jones

Certificate Number: 0105

Jordan Timber Ltd

Pocket Nook Lane, Lowton, Warrington, Cheshire WA3 1AB

Contact: Mr John Barker

Email: sales@jordantimber.co.uk

Tel: 01942 683060

Establishment ID: 004/1443.Barker

Certificate Number: 1443

Joseph Griggs & Co Ltd

Bristol Road, Gloucester, Gloucestershire GL1 5TD

Contact: Mr Kevin Cox

Email: kevin.cox@josephgriggs.com

Tel: 01452 520346

Establishment ID: 004/0132.Thomas

Certificate Number: 0132

Kent Blaxill & Co Ltd

129 - 139 Layer Road, Colchester, Essex CO2 9JY

Contact: Mr Nigel Hooker

Email: niger.hooker@kentblaxill.co.uk

Tel: 01206 575171

Establishment ID: 004/0972.Anderson

Certificate Number: 0972

Kingspan Timber Solutions Ltd

Eltisley Road, Great Gransden, Near Sandy, Bedfordshire SG19 3AR

Contact: Mr James Walker

Email: jamesa.walker@kingspan.com

Tel: 01767 676451

Establishment ID: 004/5622.Knibbs

Establishment ID: 004/5622.Peacock

Establishment ID: 004/5622.Scoot

Certificate Number: 5622

KS Timber Ltd

The Timber Yard, Wharf Road, Stanford Le Hope, Essex SS17 0EQ

Contact: Ms Carol Wager

Email: carol@kstimber.co.uk

Tel: 01375 641310

Establishment ID: 004/2757.Elbourn

Establishment ID: 004/2757.Sorenson

Certificate Number: 2757

Lawsons (Whetstone) Ltd

53 Blundell Street, Camden Town, London N7 9BN

Contact: Mr Garry O’ Sullivan

Tel: 020 7619 6470

Establishment ID: 004/1152.06.McGrath

Certificate Number: 1152

Lawsons SE

Lawsons Sidcup, Unit 2, 5 Arches Business Estate, Maidstone Road, Sidcup, Kent DA14 5AE

Contact: Mr Simon Gregory

Email: simon.gregory@lawsons.co.uk

Web: www.timberUK.com

Tel: 020 8312 1902

Establishment ID: 004/1452.Collins

Establishment ID: 004/1452.Young

Certificate Number: 1452

Llandre Sawn Wood Ltd

Hundred House, Llandriadod Wells, Powys, Wales LD1 5RS

Contact: Mr Gethin Price

Email: sales@llandresawnwood.co.uk / gary@llandresawnwood.co.uk

Web: www.llandresawnwood.co.uk

Tel: 01982 570329

Establishment ID: 004/3445.Price

Certificate Number: 3445

Marley Ltd

The Old Shipyard, Gainsborough, Linconshire DN21 1NG

Contact: Ms Jenni Forrest

Email: jenni.forrest@marley.co.uk

Tel: 01427 675546

Establishment ID: 004/6283.Largue

Establishment ID: 004/6283.Lightfoot

Certificate Number: 6283

Melingoed Ltd

Station Road, Newcastle Emlyn, Carmarthenshire SA38 9BX

Contact: Mr J D Davies

Email: dylan@melingoed.co.uk / marciamansel@hotmail.co.uk

Tel: 01239 711070

Establishment ID: 004/1346.Davies

Certificate Number: 1346

MH Southern & Company Ltd

Green Lane Sawmills, Green Lane, Felling, Gateshead, Tyne & Wear NE10 0JS

Contact: Mr Mark Williamson

Email: markw@mhsouthern.co.uk

Tel: 0191 469 8743

Establishment ID: 004/2591.Anderson

Establishment ID: 004/2591.Hall

Establishment ID: 004/2591.Thirkell

Certificate Number: 2591

Certified companies

Mid-Sussex Timber Co Ltd

Station Road, Forest Row, Sussex RH18 5EL

Contact: Mr Craig Reeves

Email: craig.reeves@mstc.co.uk

Tel: 01342 822191

Establishment ID: 004/0145.Dawes

Establishment ID: 004/0145.Demain

Establishment ID: 004/0145.Griffiths

Establishment ID: 004/0145.Jenkin

Establishment ID: 004/0145.Waters

Certificate Number: 0145

Monmouthshire Timber Supplies Ltd

P O Box 20, North End - Alexandra Dock, Newport, Gwent, Wales NP20 2YQ

Contact: Mr Bob Smith

Email: bob@montimber.co.uk

Tel: 01633 414410

Establishment ID: 004/1433.Smith

Certificate Number: 1433

Morgan & Co (Strood) Ltd

Knight Road, Rochester, Kent ME2 2BA

Contact: Mr Nigel Major

Email: nigel.major@morgantimber.co.uk

Tel: 01634 290909

Establishment ID: 004/0750.Coe

Establishment ID: 004/0750.Palmer

Certificate Number: 0750

NG Bell & Son Ltd

30 Greyabbey Road, Ballywalter, Newtownards, Northern Ireland BT22 2NY

Contact: Mr Graham Bell

Email: graham@ngbell.com

Tel: 028 4275 8243

Establishment ID: 004/1263.Bell

Certificate Number: 1263

Nicks & Co (Timber) Ltd

Canada Wharf, Bristol Road, Gloucester, Gloucestershire GL1 5TE

Contact: Mr Will O’Toole

Email: will@nickstimber.co.uk

Tel: 01452 300159

Establishment ID: 004/0159.Jeffcutt

Certificate Number: 0159

North Yorkshire Timber Ltd

t/a NY Timber.

Bridge Road, Brompton-on-Swale, North Yorkshire DL10 7HS

Contact: Mr Andrew Watters

Email: awatters@nytimber.co.uk

Tel: 01748 812953

Establishment ID: 004/2017.Hugill

Establishment ID: 004/2017.Wake

Certificate Number: 2017

P McDermott & Sons

11 Sedan Avenue, Omagh, Co Tyrone, Northern Ireland BT79 7AQ

Contact: Mr Mark McCafrey

Email: mark@pmcdermottsomagh.com

Tel: 028 8224 2066

Establishment ID: 004/1436.McCaffrey

Certificate Number: 1436

Parker Building Supplies Ltd

Jarvis Brook Goods Yard, Western Road, Crowborough, East Sussex TN6 3DS

Contact: Mr Mark Sumner

Email: crowborough@parkerbs.com

Tel: 01892 667000

Establishment ID: 004/1172.Puxty

Certificate Number: 1172

Percy A Hudson

Borough Sawmills, Northumberland Street, North Shields, Tyne & Wear NE30 1DW

Contact: Mr M A Hudson

Email: mark@percyahudson.co.uk

Tel: 0191 257 5099

Establishment ID: 004/0502.JHudson

Establishment ID: 004/0502.MHudson

Certificate Number: 0502

PGR Builders & Timber Merchants Ltd

91-97 Stadium Way, Benfleet, Essex SS7 3BN

Contact: Mr Dan Toomey

Email: dan.toomey@pgrtimber.co.uk

Tel: 01268 777600

Establishment ID: 004/2770.Ebsworth

Certificate Number: 2770

Premier Timber

Unit 1 & 2, Cullet Drive, Queensborough, Kent ME11 5JS

Contact: Mr Andy Haywood

Tel: 01795 583111

Establishment ID: 004/1557.Hayward

Certificate Number: 1557

Read Bros Ltd

Burnett Road, Sweet Briar Road Industrial Estate, Norwich, Norfolk NR3 2BS

Contact: Mr M Read

Tel: 01603 401319

Establishment ID: 004/0575.Murray

Certificate Number: 0575

Ridgeons Ltd - TTL

Herringswell Sawmills, Kennett Road, Herringswell, Bury St Edmunds IP28 6SS

Contact: Mr Eddie Hart

Tel: 01638 555850

Establishment ID: 004/1052.Danks

Establishment ID: 004/1052.Hart

Establishment ID: 004/1052.Jones

Establishment ID: 004/1052.Klimowicz

Certificate Number: 1052

Robert Price (Timber & Roofing Merchants) Ltd

The Wood Yard, Forest Road, TAFFS Well, Cardiff CF15 7YE

Contact: Mr Gwyn Pritchard

Email: gpritchard@robert-price.co.uk

Tel: 029 2081 1681

Establishment ID: 004/0517.Ellery

Establishment ID: 004/0517.Hemmings

Certificate Number: 0517

Rother Valley Group

Station Yard, Rolvenden, Cranbrook, Kent TN17 4QZ

Contact: Mr Robin Crispin

Email: robin@rvtimber.com

Web: www.rothervalleytimber.co.uk

Tel: 01580 241555

Establishment ID: 004/1155.Coles

Establishment ID: 004/1155.Green

Establishment ID: 004/1155.Sorsbie

Establishment ID: 004/1155.Wickenden

Certificate Number: 1155

Rowan Manufacturing Ltd

Main Street, Plains, Airdrie, Scotland ML6 7JE

Contact: Mr Kevin Cahill

Email: kevin.cahill@rowanmanufacturing.co.uk

Tel: 01236 814000

Establishment ID: 004/1222.Cahill

Certificate Number: 1222

RYTS Ltd t/a Ryland Forestry

106 Bridge End, Warwick, Warwickshire CV34 6PD

Contact: Mr Terry Beanland

Email: rylandforestry@aol.com

Tel: 07767 787868

Establishment ID: 004/2125.Beanland

Certificate Number: 2125

Smith Bros Timber (East Anglia) Ltd

15 Cooke Road, South Lowestoft Ind. Est., Lowestoft, Suffolk NR33 7NA

Contact: Mr Jason Harness

Email: jason.harness@smiths-timber.co.uk

Tel: 01502 569115

Establishment ID: 004/1525.Harness

Certificate Number: 1525

Sodra Wood Ltd

Units 18/19 Cirencester Business Park, Tetbury Road, Cirencester, Gloucestershire GL7 6JJ

Contact: Mr Simon Henry

Email: simon.henry@sodra.com

Tel: 01285 646000

Establishment ID: 004/1104.McShane

Establishment ID: 004/1104.Smith

Certificate Number: 1104

South London Timber Co. Ltd

Questar Ind.Estate, Unit 236, Fawkes Avenue, Dartford DA1 1JQ

Contact: Mr Edward James

Email: edward@sltimber.co.uk

Tel: 020 7252 8383

Establishment ID: 004/2273.Major

Certificate Number: 2273

Stamco Ltd

Sussex Turney & Moulding Co Ltd t/a Stamco, Churchfields Mill, Highfield Drive, Churchfields Industrial Estate, St Leonards-on-Sea, East Sussex TN38 9TG

Contact: Mr Ray Reed

Email: ray.reed@stamco.co.uk

Tel: 01424 856800

Establishment ID: 004/1232.Reed

Certificate Number: 1232

T Brewer & Co Ltd

Timber Mill Way, Gauden Rd, Clapham, London SW4 6LY

Contact: Mr Nick Smith

Tel: 020 7720 9494

Establishment ID: 004/1262.Stevens

Certificate Number: 1262

Talbot Timber Ltd

Warrior Way, Waterloo West, Pembroke Dock, Dyfed, Wales SA72 6UB

Contact: Mr Shaun Smith

Email: ssmith@talbottimber.co.uk

Tel: 01646 686480 / 685238

Establishment ID: 004/1323.Scoble

Certificate Number: 1323

The Southern Timber Company Crokers Park, Edgelands Cross, Totnes Road, Ipplepen, Newton Abbot TQ12 5UG

Contact: Mr Mike Tewson

Email: andy@southern-timber.co.uk

Tel: 01803 813803 / 01752 600066

Establishment ID: 004/2080.Fewings

Certificate Number: 2080

The Timber Group

Unit 3, Aerodrome Estate, Detling, Maidstone, Kent ME14 3HU

Contact: Mr Ian Ausher

Email: ian.ausher@thetimbergroup.co.uk

Tel: 01622 738246

Establishment ID: 004/1970.Ausher

Establishment ID: 004/1970.Couzens

Establishment ID: 004/1970.Wells

Certificate Number: 1970

Thorogood Timber Ltd

t/a Thorogoods

Colchester Road, Ardleigh, Colchester, Essex CO7 7PQ

Contact: Mr P Thorogood

Email: peter@thorogood.co.uk

Tel: 01206 233100

Establishment ID: 004/1114.Thorogood

Certificate Number: 1114

Timberlink Ltd

Sutton Road, Tern Hill, Market Drayton, Shropshire TF9 2JH

Contact: Mrs Kirsty Metcalfe

Email: operations@timberlink.co.uk

Tel: 01630 638111

Establishment ID: 004/2712.Jervis

Certificate Number: 2712

Trace Remedial Building Services

Unit 7, Graphite Way, Hadfield, Glossop, Derbyshire SK13 1QH

Contact: Mr David Hockey

Email: david.hockey@traceremedial.co.uk

Tel: 01457 865165

Establishment ID: 004/2728.Hockey

Certificate Number: 2728

Travis Perkins Trading Co. Ltd

Baltic Wharf, Boyn Valley Road, Maidenhead, Berkshire SL6 4EE

Contact: Mr Martin Wright

Email: julie.currington@travisperkins.co.uk

Tel: 01628 770577

Establishment ID: 004/0230.Wright

Certificate Number: 0230

Travis Perkins Trading Co. Ltd

Forstal Road, Aylesford, Maidstone, Kent ME20 7AG

Contact: Mr Brian Lea

Email: brian.lea@travisperkins.co.uk

Tel: 01622 710111

Establishment ID: 004/0092.Lea

Establishment ID: 004/0092.Wright

Certificate Number: 0092

Travis Perkins Trading Co. Ltd

Middlebrook Way, Holt Road, Cromer, Norfolk NR27 9JR

Contact: Mr Rob Castle

Email: robert.castle@travisperkins.co.uk

Tel: 01263 511244

Establishment ID: 004/0112.Hanlon

Certificate Number: 0112

Travis Perkins Trading Co. Ltd.

Navigation Road, Chelmsford, Essex CM2 6HX

Contact: Mr Brian Blackburn

Email: brian.blackburn@travisperkins.co.uk

Tel: 01245 490000

Establishment ID: 004/0107.Aggar

Establishment ID: 004/0107.Greenleaf

Certificate Number: 0107

Travis Perkins Trading Co. Ltd. Park Lane Sawmills, Park Lane, Finchampstead, Berkshire RG40 4PT

Contact: Mr Michael Chotter-Marsh

Email: m.chotter-marsh@travisperkins.co.uk

Tel: 0118 976 1100

Establishment ID: 004/2353.Chipper

Certificate Number: 2353

Tudors Building Supplies (Hereford) Ltd

Northwood Yard, Burcott Road, Hereford, Herefordshire HR4 9LW

Contact: Mr Darren Burge

Email: darren.burge@tudors.uk.com

Tel: 01432 265071

Establishment ID: 004/1442.Fitzer

Certificate Number: 1442

W G Burbidge

The Timberyard, Pysons Road, Ramsgate, Kent CT12 6RL

Contact: Mr Andy Burbridge

Email: andyburbridge20@gmail.com

Tel: 01843 581906

Establishment ID: 004/1697.Burbridge

Certificate Number: 1697

Wenban-Smith Ltd

14 Newland Road, Worthing, West Sussex BN11 1JT

Contact: Mr Craig Milby

Tel: 01903 230311

Establishment ID: 004/5614.Hammond

Establishment ID: 004/5614.Ide

Certificate Number: 5614

WH Bond & Sons Ltd

t/a Bond Timber

Bake Sawmills, Trerulefoot, Saltash, Cornwall PL12 5BW

Contact: Ms Amy Shepherd

Email: amy@whbond.co.uk

Web: www.whbond.co.uk

Tel: 01503 240308

Establishment ID: 004/2054.Getson

Establishment ID: 004/2054.Ivey

Establishment ID: 004/2054.Slowik

Certificate Number: 2054

William Kirkwood & Sons

5-9 Newcastle Road, Castlewellan, Co Down, Northern Ireland BT31 9DP

Contact: Mr Colin Kirkwood

Email: wkirkwoodandsons@btconnect.com

Tel: 028 4377 8276

Establishment ID: 004/2737.Kirkwood

Certificate Number: 2737

Youngs Timber & Builders Merchants

19-23 Hythe Road, Dymchurch, Romney Marsh, Kent TN29 0LN

Contact: Mr John Levitt

Email: john@youngs-tbm.co.uk

Tel: 01303 875588

Establishment ID: 004/2208.Levitt

Certificate Number: 2208

TIMBER TRAINING COURSES 2022

VISUAL STRENGTH GRADING: SOFTWOODS

The Horse Trust, Princes Risborough, Buckinghamshire, HP27 0PP

28 March – 1 April 2022

6–10 June 2022

3–7 October 2022

£1375 + VAT per delegate

VISUAL STRENGTH GRADING: HARDWOODS

The Horse Trust, Princes Risborough, Buckinghamshire, HP27 0PP

11–12 May 2022

8–9 November 2022

£750 + VAT per delegate

TIMBER FRAME CONSTRUCTION

BM TRADA, High Wycombe, Buckinghamshire, HP14 4ND

1 March 2022

7 June 2022

8 September 2022

1 December 2022

£340 + VAT per delegate

TIMBER FRAME FOR ENGINEERS

BM TRADA, High Wycombe, Buckinghamshire, HP14 4ND

9 May 2022

3 November 2022

£340 + VAT per delegate

EUROCODE 5

Online

Essentials: 18 May 2022

Connections: 20 September 2022

£340 + VAT per delegate

Robin Lancashire Senior Timber Frame Consultant

Phil O’Leary Technical Manager

Lewis Taylor Senior Timber Frame Consultant

Dr Keerthi Ranasinghe Principal Engineer – Structural Timber