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MAY 2014 ISSUE: 59

SA R36 EACH INCL. / R360 PER ANNUM INCL.


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MAY 2014

ISSUE: 59

EDITOR’S COMMENTS....................................................................................................... 2 CONTRIBUTORS................................................................................................................. 4 INTERIOR DESIGN........................................................................................................ 6-12 COVER STORY.............................................................................................................. 14-16 LSFB.................................................................................................................................. 18-19 INDUSTRY INSIGHT.................................................................................................... 20-22 ROOFING....................................................................................................................... 24-26 NEWS............................................................................................................................... 28-29 COMPANY PROFILE.................................................................................................... 30-31 NEWS............................................................................................................................... 32-33 INSULATION....................................................................................................................... 34 INSULATION................................................................................................................. 36-37 CEMENT & CONCRETE............................................................................................. 38-39 CEMENT & CONCRETE............................................................................................. 40-41 GREEN ROOFING........................................................................................................ 42-43 HEALTH & SAFETY............................................................................................................. 44 EVENTS.................................................................................................................................. 46 EVENTS.................................................................................................................................. 48

Trademax Publications SA Roofing Tel: 0861 SA ROOF Tel: 0861 727 663 Cell: 082 266 6976 Fax: 0866 991 346 www.trademax.co.za Postnet Suite 241 Private Bag X103 N1 City 7463

PUBLISHER: Billy Perrin billy@trademax.co.za 0861 727 663 EDITOR: Jennifer Rees editor@trademax.co.za 0861 727 663 ADVERTISING: Jacqui Marsh jacqui@trademax.co.za 0861 727 663 LAYOUT & DESIGN: Craig Patterson craig@trademax.co.za SUBSCRIPTIONS & DATA: Celeste Perrin celeste@trademax.co.za 0861 727 663

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DISCLAIMER The views expressed herein are not necessarily those of Trademax Publications. Although we have done our best to ensure the accuracy of our content, neither Trademax Publications nor SA Roofing magazine will be held liable for any views expressed or information disseminated in this issue.

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EDITOR’S COMMENTS

Concrete ideas As the Totally Concrete Expo, for whom we are acting as a media partner, approaches, we turn our focus to concrete and its everpresent role in roofing and construction at large.

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ur May issue boasts a number of great features from insulation to fastening systems, and of course, concrete in roofing.

On the cover is Marley Roofing, whose cover story highlights the company’s drive to do business in a sustainable way. Adhering to high industry standards, Marley Roofing’s product offering is “sustainable and environmentally responsible.” With energy efficiency, strength, durability, affordability, and minimal maintenance requirements, Marley Roofing products really are ‘Dynamically preserving the future.’

In our June issue of the SA Roofing magazine, you can look forward to more roofing highlights that include, among other features, a focus on timber and associated products in the roofing environment. To participate in this issue, a number of copies (in addition to our regular distribution) of which will be distributed at WoodEX for Africa 2014, please contact Jacqui Marsh on 0861 727 663, or email jacqui@trademax.co.za. Welcome to the May issue of the SA Roofing magazine. Enjoy the read. Jen

Furthermore, The Concrete Institute hones in the on the multifaceted applications and advantages of pre-cast concrete, and we turn the spotlight on an international project in Colombia, whose exterior, detailed with concrete ‘tree trunks,’ mirrors and pays homage to the surrounding landscape.

STEEL AWARDS 2014 REMINDER: Steel Awards 2014 Entry Deadline is Wednesday, 30 April 2014.

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CONTRIBUTORS

Contributors LYNDSAY COTTON Lyndsay entered the construction industry in 1989 and has many years’ experience in both the civil and commercial spheres of this industry. He is well versed in residential construction and especially roofing, as he erected many of the roof structures in over 300 luxury houses and upmarket units in residential clusters he constructed. Holding a BSc (QS) degree, and a Diploma in Project Management, Lyndsay is the General Manager of a leading Gauteng-based fabricator, and is the current Chairman on the board of the ITC-SA. Although work always takes a priority, his passion is exploring the back roads of Africa on a KTM990 Adventure motorcycle.

NEELS NORTJE Neels is the Master Builders Association KZN's Health and Safety Manager and has served the Association in this position for more than 15 years. He started his working career with ESKOM in 1981 where he qualified as a Draughtsman. In 1986 he changed his focus to Safety Risk Management and later qualified as an Occupational Health and Safety Risk Management Officer. He holds a National Diploma in Safety Management and has been practicing Occupational Health and Safety for the past 27 years. He is a founder member of the South African Institute of Occupational Safety and Health (Saiosh) and is a Chartered Member of the Institution of Occupational Safety and Health in the UK. He currently serves on the Minister of Labour's Advisory Council for Occupational Health and Safety (ACOHS). When it comes to Construction Health in Safety in South Africa Neels is widely regarded as the industry's leading expert.

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I NTE R I O R D E S I G N

Insurance company takes the crown for forwardthinking office design In line with a soon-to-be-unveiled, large-scale repositioning of its corporate brand, Regent Insurance has pioneered an innovatively designed regional office in KwaZulu-Natal that will serve as the blueprint for all the company’s offices going forward.

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hus far, Regent’s new corporate direction has been revealed internally, and will be introduced to customers and key stakeholders throughout the course of 2014.

Regent’s new Umhlanga Ridge premises constitute one of the first steps the company has taken towards implementing its new identity. The office is suitably located in Mayfair Place, a recent development by Growth Point that is in close proximity to the Gateway shopping complex and the rapidly expanding Umhlanga business and residential zones. The landmark office scheme, created by Inhouse Brand Architects, successfully translates Regent’s upgraded brand identity into the built environment through the use of exciting and carefully considered materials and clever design details.

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Regent’s Group Head: Marketing & Communications, Michelle Ashen-Abrahams, appointed Inhouse for the company’s design expertise and past successes in translating what is usually a two-dimensional corporate identity into three dimensions. "Having worked with Inhouse on previous projects, it was an easy choice as to who would bring our brand to life in a built corporate environment,” says Ashen-Abrahams. “Inhouse understand brand and marketing concepts like an advertising agency, execute with humanism in mind and think about our customers when they collaborate with all our key stakeholders from marketing and strategy to innovation and facilities.”

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I NTE R I O R D E S I G N


I NTE R I O R D E S I G N Inhouse’s experience includes creating acclaimed corporate offices for the likes of Union Swiss, Media 24, Old Mutual, Santam, Ogilvy and numerous others. The company has been in existence for over a decade and is the recipient of numerous design awards for its commercial spaces. Inhouse’s recent work for Regent consists of a 380 square metre pilot space that will set the precedent for how Regent’s offices and company image within the built environment will be perceived and rolled out in the future. The new working premises showcase what can be achieved when the brand is integrated and expressed at the interior design level. “This is more than just an interior job,” AshenAbrahams explains. “This execution for us is about space-efficiency and effective long-term cost management, as well as executing our brand strategy in a different way and creating a space our employees can proudly call their corporate home.” Inhouse’s commitment to the project involved not only refreshing existing furniture and desk systems, but also executing thorough space-planning research. In particular, the Inhouse process involved examining the reception and front-of-house waiting area to assess the best way for Regent to interact with visitors. Inhouse maximized open-plan spaces to promote communication and better output from staff. The design team, led by Inhouse Director Phillip Wyatt, focused on increasing staff morale by providing an appealing work environment.

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There are times when piercing is a really smart choice….When it’s pierced fix roofing from GRS Ultra-durable Pierced Fix roofing from GRS When you’re looking for smart roof cover on any large project, take a good look at GRS pierced-fix solutions. All of the GRS pierced-fix roofing and cladding options, in various substrates, offer really smart designs that maximise their primary attributes. Choose according to looks, strength, durability, economy, drainage, weight, or ease and economy of installation. GRS has really smart machinery, to provide accurate bullnosing, cranking and curving of sheeting. The smart GRS team of experts is also available to assist with product choice, design details, estimating and technical advice. So get smart and speak to GRS when it come to GRS IBR, Supa-Clad, GRS Corrugated, Nu-Rib and BR7 . Talk to us, THE SMART ROOF PEOPLE on 011 898 2900 or visit www.globalroofs.co.za or info@globalroofs.co.za

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I NTE R I O R D E S I G N

In order to encourage a mix of different functions within the office space, Wyatt incorporated what he refers to as ‘camp sites’ – zones that allow staff to break away and meet informally. Workplace efficiency was also a prime concern, with attention paid to providing the correct infrastructure relating to conferencing systems within meeting rooms and boardrooms. The materials and finishes used throughout were specifically selected to complement how Regent envisage themselves both now, and in the future, as a leading insurance company. Detailing was used as a vehicle to express Regent’s company values. For example, there’s a beautiful tile that talks about sophistication and natural timber that talks about honesty. Steel is used generously throughout because it is elegant, precise and strong. Moreover, “you’re able to achieve a lightweight feel to the design because of the properties of the material,” explains Wyatt. Because there’s an assured quality to the various to bespoke furniture pieces and the actual installation, confidence in Regent is instilled in the viewer. This sense of confidence and security is enhanced through the introduction of custom-made branded elements, in particular the innovative signage. Directional and branded signage regularly makes use of perforated and cutout elements which reveal the layer beneath, denoting transparency. Cutout elements are a common theme in the design scheme not only because Regent’s modus operandi involves transparency and visibility, but also because the layering adds depth. The signage in the reception area – the first point of contact with visitors – consists of the Regent logo cutout in steel to create a striking feature behind the welcome desk, which is itself clad in steel with a cut-out effect. A large feature wall in the waiting area incorporates Braille-like iconography in order to relay Regent’s inclusivity and sensitivity, and the company’s ability to speak equally to all demographics. Regent’s brand pillars of strength – namely, integrity and innovation – have been laser-routed into the cupboard doors in the reception area for all to see. Again, to reinforce the sense of transparency, the ceiling in the reception area has been softened with a suspended slatted timber ceiling feature. Created in solid wood, it is a modernized version of the conventional bulkhead and carries integrated lighting. Inhouse also brought nature into the environment through a floor-to-ceiling planted wall.

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4mm Alububble® 2906, D10- White bubble with foil backing

4mm Alububble® 1983 D10 both sides reflective foil

Details

Results

Conforms to SANS 1381 part 4 (Full report available on request) Form

Roll

Product thickness

4mm

Length

>4000mm

Width

1250 mm

Mass per unit area Finished Roll Weight

270g/m² 13.5kg

Emissivity

<0.05

}

Water Vapour Permeance

<0.002 g/(s.MN)

Effective Coverage (100mm overlap)

46m²

Roll Diameter

460mm

Thermal Resistance “R” (m²K)/W

1.103

Details

Results

50m²

Conforms to SANS 1381 part 4 (Full report available on request) Form

Roll

Product thickness

4mm

Length

>4000mm

Width

1250 mm

Mass per unit area Finished Roll Weight

346g/m² 17.5kg

Emissivity

<0.05

Water Vapour Permeance

<0.002 g/(s.MN)

Effective Coverage (100mm overlap)

46m²

Roll Diameter

460mm

Thermal Resistance “R” (m²K)/W

1.454

}

50m²

Tel: 011 462 9122 Email: ati@ati-insulations.co.za www.alububble.co.za

AfricA ThermAl insul ATions A division of WesT rAnd engineering

Alutherm® Polyester (AP) blanket. Faced on one side with aluminium foil and on the other side with a bubble facing. Details

Alutherm 50mm Alutherm 100mm

Tested in accordance with and conforms to 1381 part 1: 2007 Material Classification

TYPE 3 - Mats or Bats with reflective membrane laminated to material

Length (Std)

10m Roll

10m Roll

Width (Std)

1100mm

1100mm

Roll Diameter

600mm

760mm

Density

12Kg/m³

12Kg/m³

Finished Roll weight

11kg

17kg

NRC – Noise Reduction Coefficient

0.60

0.70

Resistance ‘R’ (m²K)/W

1.25

2.65

Conductivity ‘K’ W/m.K

0.040

0.040

Thermal Property Values

Alutherm® Fibre Glass (AF) blanket. Faced on one side with aluminium foil and on the other side with a bubble facing. Details

Alutherm 50mm

Alutherm 75mm

Alutherm 100mm

Alutherm 135mm

Tested in accordance with and conforms to 1381 part 1: 2007 Material Classification

TYPE 3- Mats or Bats with reflective membrane laminated to material

Length (Std)

10m Roll

10m Roll

10m Roll

10m Roll

Width (Std)

1100mm

1100mm

1100mm

1100mm

Roll Diameter

600mm

720mm

760mm

800mm

Density

12Kg/m³

12 Kg/m³

12 Kg/m³

12Kg/m³

Finished Roll weight

11kg

14kg

18kg

23kg

0.80

0.85

0.92

NRC – Noise Reduction Coefficient 0.75 Thermal Property Values Resistance ‘R’ (m²K)/W 1.25

1.88

2.67

3.38

Conductivity ‘K’ W/m.K

0.040

0.037

0.040

0.040


I NTE R I O R D E S I G N Glass is also used consistently throughout to create a feeling of spaciousness and to echo the recurring motif of transparency and visibility. Inhouse has installed a frameless glass wall system with a clever touch: the glass walls boast integrated white boards with a dualistic purpose – they can be used on both sides of the glass, either within the office, or on the open-plan side. Colour is a key factor in the scheme and there is a bold and confident play on Regent’s new corporate colour, which has gone from a previous deep blue to Vermillion. Vermillion has thus been used throughout to highlight and frame the glass walls of the individual offices, as well as the dividing wall demarcating the pause area. “Colour plays a huge role in our psychological state,” explains Wyatt, “and derivatives of red relate to a positive, dynamic and energetic outlook, that complements Regent’s new direction.” Based on the successes demonstrated in this new flagship office, Regent has commissioned Inhouse to develop a brand manual to outline the implementation process, so that this innovative solution can be used to roll out anything from a small satellite office to the head office itself, allowing Regent to reign as king of a well-designed castle. “We look forward to developing more of our corporate spaces with Inhouse,” Ashen-Abrahams states, “and creating environments that are innovative, creative, friendly and inspiring corporate offices for our people, our customers and our key stakeholders."

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ZAP FASTENING SYSTEMS OFFERS YOU: The widest range Guaranteed quality and performance Best value for money Nationwide distribution

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Made to SANS1273 Class 4 specifications. For use in severe marine and industrial environments. Compatible with painted Zinc and painted Zinc Aluminium coated sheeting

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ZAP FASTENING SYSTEMS HAVE A VARIETY OF HEAD STYLES AND DRILL POINTS FOR ALL APPLICATIONS

ZAP FASTENING SYSTEMS RANGE FROM 13MM TO 180MM IN LENGTH

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COV E R STO RY

Roof tiles set for sustainability Marley Roofing South Africa is leading the way as the need for building materials, which contribute to a sustainable way of doing business, grows.

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he company recognises that architects, engineers, developers, and owners are seeking efficient, innovative building solutions. These solutions must conserve nonrenewable resources as environmental awareness increases. Concrete roof tiles do not rust and are therefore being increasingly recognised for their inherent environmental benefits as a means to support creative and effective sustainable development. Marley Roofing SA forms part of the Etex Group, which operates in the building materials sector in 44 countries worldwide, employing more than 16 000 people. The company continuously improves its products as it benefits from ongoing research and development, as well as resources within the Etex Group.

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In addition, the concrete tile manufacturer adheres to the strict Etex environmental, occupational, health, and safety targets, as well as its reporting standards. Marley Roofing also benchmarks its performance against the other Etex Group companies, while striving for continual improvement and world-class standards. All Marley Roofing’s products are manufactured in accordance with ISO 14001 environmental and OHSAS 18001 occupational health and safety management systems requirements. The company is one of only a few concrete roof tile manufacturers that have achieved these standards in South Africa. The company’s concrete tiles also carry the SANS 542 concrete roofing tiles mark, the SABS product mark for quality. Without a doubt, Marley Roofing’s products are environmentally and socially responsible.

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COV E R STO RY Since houses and buildings constructed with insulated concrete roofs are not subjected to high daily temperature fluctuations, owners can lower heating and cooling bills significantly. Heating, ventilation, and air-conditioning can also be designed with smaller capacity equipment for additional savings.

STRENGTH AND DURABILITY Roofs that stand the proverbial test of time through their extreme durability and low maintenance requirements have a significant sustainable advantage over other roof structures.

ENERGY EFFICIENCY Marley Roofing also supplies various types of radiant barriers for roofs, which help to improve energy efficiency. Superior thermal efficiency is obtained through an insulated concrete roof system with a low air infiltration. The result is optimal energy performance over the whole lifespan of a building.

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Moisture, which can undermine other building materials through rust or rot, has no weakening effect on Marley Roofingâ&#x20AC;&#x2122;s concrete roof tiles. In fact, Marley Roofingâ&#x20AC;&#x2122;s concrete roof tiles continue to strengthen over time and this is why roofs that used these roof tiles more than 40 years ago are still intact today.

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COV E R STO RY AFFORDABILITY Marley Roofing has designed a lightweight roof tile, the Double Roman Plus Range, which does not compromise the properties or the quality of the product to cater for the price-conscious customer. The concrete tile manufacturer’s range of roof tiles is versatile, finding application in many different buildings, including houses, schools, offices and recreational centres. There is minimal wastage or off-cuts during the tiling process, which makes Marley Roofing’s roof tiles an extremely cost-effective option for owners over time, depending on the roof design. These factors and more have swayed the government and developers to introduce concrete roof tiles in low-cost housing.

Marley Roofing also has an exclusive coating, called M22, which is used on the company’s coated range of tiles. The coated tiles are treated to reduce mould build-up, particularly in coastal areas. M22-coated tiles also deal with problems associated with colour, providing a solution when colour uniformity is a requirement. M22-coated tiles provide an aesthetically pleasing appearance from the start, and are a top choice for larger developments where colour uniformity is essential. With an active mix of benefits, Marley Roofing will keep their focus on providing industry professionals with a complete system while staying true to their pay-off line, “Dynamically preserving the future.” For more information, visit www.marleyroofing.co.za.

LOW MAINTENANCE Marley Roofing’s concrete roof tiles are inert and compact. This means that the roof tile does not lose its key properties over time. There is also less need for cleaning or repainting the roof. All these factors contribute to the sustainability of the concrete roof tiles, as little resources are used in their maintenance.

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LSFB

Light steel frame building

ideal for penthouse projects The light steel frame building (LSFB) method, which has proven itself across the building spectrum, is also ideal for add-on loft units. This is the opinion of John Barnard, director of the Southern African Light Steel Frame Association (SASFA).

Light Steel Frame Building was used for these upmarket loft apartments at Maboneng, an inner-city project in Johannesburg. “The Silverline Construction group, well-known for its high profile LSF projects, such as McDonalds restaurants has recently shown at Maboneng – ‘place of light’ – another high profile development east of Johannesburg city centre, just how appropriate LSFB is in penthouse or loft units,” Barnard says. In Maboneng the loft units are built on the tops of various existing multi-storey buildings within the precinct and Silverline director, Jonathan Pepler says, “LSF was the obvious choice for the Maboneng project due to the flexibility of the building method, the low mass of the materials and the speed of construction. Also, it is convenient to use LSF on rooftops, as the apartments can be constructed without the use of cranes, which results in significant savings for the developer,” he says.

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Pepler adds that Maboneng, the brainchild of Jonathan Liebmann, a young Johannesburg developer, represents a “remarkable rejuvenation of a city precinct, which has brought a cosmopolitan flair to a previously neglected part of the city. The neighbourhood now bustles with galleries, art studios, offices, entertainment and retail spaces.” “The most profound impact of a development like this can be seen and felt in the people who live, work and play there,” Pepler says. The precinct now offers residential complexes with 24-hour security and spectacular city views. Residents share their building with ground floor retail, exhibition space and restaurants. More and more fashionable, trendy tenants are flocking to Maboneng for stylish loft apartments complete with balconies, rooftop gardens and bars all with top-of-therange, up-market finishes.

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Barnard reiterates the ease of logistics when using LSFB. “The materials for this project were hoisted up using a manual pulley system – and the additional mass of the new building volume could easily be supported by the existing reinforced concrete structure. There was also no need to beef up the existing foundations.” A light steel frame floor was built using LSF joists, spanning from column to column” adds Pepler. “The units are earthed to the existing structure, and plumbing and electricity could be connected to the existing services.”

All the units built thus far were sold off during the construction period. Barnard explains that the building consists of a light steel frame clad with fibre cement boards externally, with glasswool insulation in the wall cavities. The internal lining consists of fire resistant gypsum board to provide the required fire-rating, as well as a perfect surface for internal finishes. Barnard says LSFB is eminently suitable for vertical extension of existing buildings due to the low mass of the structure. The LSF walls for this development of five apartments have a total mass of only 32 tons – which includes the steel frame, the external cladding, insulation and internal lining.

Barnard says, “Due to the excellent insulation in the walls and roof, LSFB saves electricity required for heating and cooling of the building. Research by the CSIR has indicated that LSF residential buildings will require on average only 50% of the energy to heat and cool to comfortable temperatures compared with a similar uninsulated brick building.” “Silverline Group generally reduces material waste by 30%, transport costs by 80%, and lowers the carbon footprint with the LSF building methodology, and is able to significantly reduce the construction time compared with heavy masonry building. The Maboneng job was constructed in only three months and the developer was so pleased with the outcome, that he signed us up for a further three projects,” concluded Pepler.

LSFB

“Compare that to the 340 tons had masonry walls been used,” he says.


I N D U STRY I N S I G HT

The degradation of timber (structures) caused by prolonged exposure to rain "Heavy rains cause countrywide havoc – news24 – 11 March 2014" By Lyndsay Cotton, General Manager of LCP Roofing and Chairman of the ITC-SA.

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he South African Weather Service reported that the Gauteng Province had received the heaviest rainfall in 14 years and, furthermore, that it was deemed to be very unusual. Elsewhere over the corresponding period, various news agencies reported heavy rainfall in other parts of the country with the resultant damage to property and loss of life. This causal effect of global warming cannot be ignored. Many truss fabricators and timber framers, during prolonged periods of inclement weather are continually posed with the question of whether structures under construction are being potentially compromised when exposed to rainy and flooding conditions. Firstly, we need to look at the basic moisture properties of air or kiln dried timber and the South African climate in which these structures are erected.

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After drying and grading, the moisture content of structural timber will be less than 15%. Timber is naturally hygroscopic, which means that it will tend to try to reach a state of equilibrium and balance with the moisture content of the environment in which it exists. Research by Prof. Tim Rypstra (now retired), of the Department of Forest and Wood Science of Stellenbosch University, concludes that over 90% of South Africa's climate is made up of a timber equilibrium moisture content of 8%. Furthermore, research also indicated that most modern heating and cooling systems will maintain an average timber moisture content of 8% in buildings. From this, it can be accepted that a timber structure, be it a completely timber framed building or only the roof trusses, once ‘settled’ into its environment, will migrate to an average moisture content in the region of approximately 8%.

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I N D U STRY I N S I G HT

The degradation of timber is caused by repeated wetting and drying, which causes the timber to swell and shrink, and can be broadly defined within two categories: • Weathering: Repeated and irregular movement of moisture into and out of timber, which will cause various deformations, such as swelling, raised grain, warping, cupping and splintering. • Biological attack occurs both on the surface and/or inside the timber element. The excess of moisture is the primary cause of attack by mould, algae and fungi. Attack by wood borers and termites would also fall within this definition. A well-designed and constructed building will not be conducive to conditions which support mould growth or fungal attack, as it will stay dry enough to prevent mould spores from becoming active. Mould, which comes from a variety of sources, feeds off the starches and sugars on the surface of timber, and is a result of prolonged high moisture, but does not cause rotting. Mould growth is a superficial occurrence and will not influence the structural durability of timber. It is rather the effect of bad design and poor construction techniques, such as high levels of condensation due to inadequate ventilation and poor circulation, leaking pipes, gaps in flashings, leaking roofs and porous concrete elements which will lead to the growth and long-term establishment of mould.

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For mould growth to occur on timber, the moisture content will have to be above 19% for a period of a week or more and will survive when, by weight, the moisture content of the structural timber is between 20% to 28%. The fibre saturation point of timber is at approximately 28% (but can vary depending on the species). This is the point at which wood decaying fungi will develop and this condition will have to exist for more than a week for it to develop and survive.

THE FOLLOWING FOUR CONDITIONS MUST BE SATISFIED IN ORDER TO PROMOTE FUNGAL GROWTH: • Oxygen: This condition will not occur when timber is below the water table. • The optimum temperature for fungal activity is between 24 and 30 degrees Celsius. Fungal activity is dormant at 0 degrees Celsius and diminishes beyond 30 degrees Celsius. • Fungi require a food supply in order to survive, which is derived from the wood cells. The application of a fungicide will cut off this source of the food supply. • The moisture content must exceed 20% Active mould growth would be indicative of a continuing moisture problem and must be investigated.

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I N D U STRY I N S I G HT Should the need exist, and really only for aesthetic reasons, the visual effects of mould growth can be removed by applying a weak solution of standard household bleach. The purpose is not to ‘kill’ the mould, but to remove as much as possible in order to restore the visual effect of the timber. Timber ages, and with aging and weathering it releases its colour which is contained in the tannins, resins and waxes which are close to the surface of the timber. Although the sealing and preservation of timber is always preferable, the release of these tannins, resins and waxes, especially in timber where these levels are high, could cause a sealant coat to delaminate. The high temperature levels generally prevalent in roof voids could have the same effect, although this effect would be greatly reduced with the majority of the types of structural timber used in South Africa. The sealing of timbers in roof voids and framed structures is therefore generally unnecessary unless the incidence of wood borer and termite infestation cannot be excluded whereupon the preservation of the timbers would be mandatory.

TECHNICALITIES ASIDE, WHAT DOES THE AFOREMENTIONED MEAN TO THE FABRICATOR, FRAMER, BUILDER AND HOMEOWNER? • Structural timber in South Africa is under strict third party surveillance through certification by an accredited certification body such as the South African Technical Auditing Services (Pty) Ltd (SATAS). • Roof truss and framing design and quality are controlled by internal or independent third party audits initiated by the Institute for Timber Construction.

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• Trusses or frames delivered to the building site should preferably be covered by the contractor, but it should be specifically noted that the timber should be stacked off the ground and adequate ventilation must be provided. Completely enclosing with heavy tarpaulin is to be avoided. • Surface fungi and discolouration will not have any negative effect on the strength of structural timber, provided the timber is allowed to dry to below 15% as soon as possible. • The prolonged exposure of timber trusses to a rainy period not exceeding four or five weeks will not have any negative structural effect and especially if the structure is erected and braced according to the design intent. • The structure should be covered as soon as possible, weather permitting. • Free airflow should be allowed for as long as possible or until the moisture content is below 15%, whereupon ceilings or internal cladding can be installed. • Untreated timber structures should not be exposed to repeated wetting and drying over a period of many months or even years. • The homeowner is to ensure that all flashings and waterproofing systems are annually maintained, as most manufacturer and applicator guarantees will only be valid should an annual maintenance plan be in place and executed. • Fabricators and framers must ensure that all documentation and quality control procedures are in place and are available for inspection should it be required.

FOR MORE INFORMATION, CONTACT: (c) 082 441 5026 | 0861 LCPROOF (e) admin@lcproofing.co.za (w) www.lcproofing.co.za

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ROO F I N G

The â&#x20AC;&#x2DC;defaultâ&#x20AC;&#x2122; of roof ridge and hip line fixing methods When it comes to roof ridges and hip lines, not much thought is put into the type of application used. Mortar ridge and hip lines are a common sight on South African roofs, and while the initial set-up costs of mortar application may be the driving factor for its popularity, there are prominent characteristics of mortar ridges that should urge a more innovative and modern solution to ridge and hip line applications.

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ypically, weather conditions cause the roof construction to expand and contract. Mortar hardens and does not expand and contract with varying weather conditions or daily temperature variations. This can lead to cracks forming that eventually increase in size. Rain then penetrates the ridge and hip line through these cracks and causes damage to the interior of the roof. Ongoing rain damage can cause trusses to rot, which can pose a serious health risk to the occupants of the property. Often these ridge and hip lines are fixed using the same mortar method which is then over coated with a waterproofing coating or compound. This looks unsightly and costs extra to repair.

THERE ARE ADDITIONAL ELEMENTS OF THE SYSTEM IN ADDITION TO COMPACT ROLL TO ADD TO ITS EFFICACY: 1. Pliable Ridge Tree that aligns the ridge and hip battens. The ridge and hip batten is used to fix the ridge and hip tiles using the ridge clips 2. Ridge Clip that facilitates the rapid and secure fixing of ridge tiles 3. Kro Klips that are corrosion-resistant spring clips that fix tiles to valleys and hips

Coverland Compact Roll is an innovative solution to traditional mortar ridge and hip line fixing methods. It forms part of a system that allows for the thermal expansion and contraction of the roof structure. The system is called the Dry Ridge System, so named due to the dry application of the Compact Roll on the ridges and hips and because of its weather proof quality. The Dry Ridge System also allows for optimum air circulation of the roof space.

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ROO F I N G Compact Roll can be stretched to fit any roof profile and its unique, integrated waterproofing and ventilation features, when combined with the Ridge Tree, provide optimum airflow and 100% leak-free performance.

THE UNIQUE, PATENTED 4-LAYER ASSEMBLYÂŽ OF THE COMPACT ROLL ENSURES: 1. Sustainable sealing (butyl-supported aluminium compound) 2. High tearing strength (very resistant PET Polyisobutylene compound) 3. Maximum waterproofing properties, while allowing ventilation (ventilating holes are covered by a high performance fleece) 4. Extreme adhesion, due to the highly effective CH-bond butyl glue Although not as inexpensive as traditional mortar fixing, the Coverland Dry Ridge System is economical in the long run with respect to material and labour. Compact Roll is a longterm solution that is easy to install, aesthetically pleasing and, best of all, maintenance free. Produced and tested in Germany, our ridge and hip solutions for your roof stand for durability and quality. Locally, Compact Roll is certified by AgrĂŠment South Africa. Keep Coverland Compact Roll for roof ridges and hip lines in mind. When it comes to your next project put our innovative roofing solution to the test.

Contact Coverland on info.sa@monier.com for more information with the reference code SAR Dry Ridge.

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ALL THE RIGHT MOVES WHEN CHOOSING INSULATION 21

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THE RIGHT CHOICE FOR INTELLIGENT ORGANS. MOVE TO BLOCK 25

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24 YOU DID NOT USE LAMBDABOARD

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SUPERIOR LONG TERM R-VALUE. MOVE TO BLOCK 16

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16 HIGH COMPRESSIVE STRENGTH. ADVANCE TWO BLOCKS

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LAMBDABOARD IS AESTHETICALLY PLEASING

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8 MOISTURE AND WATER RESISTANT. MOVE TO BLOCK 14

YOU DID NOT USE LAMBDABOARD

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THERMOSET, DOES NOT MELT, DRIP OR SPREAD FLAME

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START

YOU ALWAYS WIN WITH LAMBDABOARD

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REDUCES ENERGY USAGE IN A BUILDING. MOVE TO BLOCK 25

YOU DID NOT USE LAMBDABOARD

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ENVIRONMENTALLY FRIENDLY & RECYCLABLE

AUTOMATICALLY ADVANCE TWO BLOCKS

Sometimes making the simplest choices makes all the difference to the environment. Lambdaboard is the eco-friendly choice when it comes to insulating your home,

office, building or warehouse. Lambdaboard offers the highest levels of insulation at an affordable price without damaging the environment. Use Lambdaboard today!

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R E F R I G E R AT I O N

w w w. l a m b d a b o a r d . c o m

I N D U S T R I A L


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Saint-Gobain Gyproc Ceiling Tiles awarded Premium Ecospecifier SA Product Listing Saint-Gobain Gyprocâ&#x20AC;&#x2122;s range of ceiling tiles has achieved the prestigious Premium Ecospecifier SA Product Listing. This accreditation verifies that Saint-Gobain Gyproc range of ceiling tiles are innovative products that represent high value over their lifetime, not only in the traditional sense, but also in the expanded sense of health, wellbeing and productivity of their total life, in the context of the people, buildings and systems they serve.

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SPECIFY ITʼS WHITE & GREEN THE ENERGY EFFICIENT INSULATION LEGISLATION SOLUTION Expanded Polystyrene is used for thermal and sound insulation in walls, roofs, and floors. Loose beads are used as aggregate in lightweight concrete, plasters and renderings. Also used for underfloor heating systems, drainage boards, permanent formwork, foundation and prefabricated wall systems.

EPS Rated A+: Summary of Green Guide Ratings for Expanded Polystyrene - Published by BRETrust 2011

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Low carbon footprint

ccording to Ecospecifier SA, all products submitted for evaluation by SaintGobain Gyproc achieved accreditation, verifying them as commercially available, environmentally preferable products or materials that have environmental qualities that reduce potential environmental impacts across their life cycle.

Conserves energy Life Cycle Assessment (LCA EPS reduces your

The range of ceiling tiles was subject to rigorous scrutiny and underwent the following evaluations by Ecospecifier SA: Life-cycle Assessment, Human Health Risk Assessment, Ecological Quality, Resource Depletion, Corporate & Social Sustainability and Green Building Scheme Assessment.

“Achieving a Premium Product Listing with Ecospecifier SA, the benchmark source of verified, life-cycle based information of eco-preferred products is key for us. The accreditation of our ceiling tile range follows in quick succession after our recent listing achieved for our range of plasterboards for walls and ceilings and is testimony to our commitment to being very aware of the impact our products have on the planet. Our products are designed to create safe, healthy urban habitats that enable comfortable living. We strive towards international standards of sustainability, exploring more and more ways to manufacture differently, build differently and make a difference to the world we live in,” explains Evan Lockhart-Barker, GM Marketing Saint-Gobain Gyproc.

POWERHOUSE Advertising 31652

In addition, the products do not contain significant quantities of substances that have harmful ecological or health impacts. The accreditation also affirms that the products were not sourced using processes harmful to high conservation value and/or remnant natural ecological communities or bio-reserves. The products do not create major environmental or health degradation.

projects environmental impact

Fire Retardant Recyclable No CFCʼs

Find a supplier

www.epsasa.co.za www.expandedpolystyrene.co.za P. O. Box 7861 Halfway House 1685

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t: 011 805 5002 f: 011 805 5033 epsasa@aaamsa.com


CO M PA N Y PRO F I LE

SE Industries Quality in service is everything

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E Industries is a diverse company that provides a vast range of services and turnkey solutions to allow you to focus on your core business.

QUALITY IN SERVICE IS EVERYTHING This mantra is the cornerstone of SE Industries’ business philosophy and principles and the company is committed to upholding its reputation of unparalleled service by continually exceeding customer expectations. SE Industries’ services include health, hygiene and janitorial solutions, space solutions, ozone solutions, maintenance solutions, quayside solutions, and, more recently, roofing solutions under the banner of well-respected Masslite Roofing Solutions.

HEALTH, HYGIENE AND JANITORIAL SOLUTIONS: SPECIALISED CLEANING – INDUSTRIAL, COMMERCIAL AND RESIDENTIAL The Interclean division of SE Industries specialises in the cleaning of offices, factories, shopping centres, homes, and hospitals. The cleaning team is highly trained in the administration of deep cleaning of ablutions and sanitary services, as well as canteen and medical applications.

HEALTHCARE PRODUCTS SE Industries provide a total healthcare solution that is cost-effective and environmentally friendly and supply a range of healthcare products, on a rental basis or as an outright purchase, and supply hand driers, hand care products, feminine hygiene applications, air and surface care products, hand and seat hygiene, toilet tissue dispensing products, paper products, wash room and office hygiene solutions.

PEST CONTROL Dependent on the pest control application required, SE Industries offer solutions for wood destroying insects (with clearance certificates), including termites, and woodborer beetles, as well as control of nuisance insects, crawling insects, flying insects, rodents, stored product pests, moths, flour beetles, etc.

SPACE SOLUTIONS SE Industries is an accredited manufacturer and supplier of modular units with a commitment to complete customer satisfaction. As a seasoned leader in custom-manufactured modular units, the company prides itself in the ability to design, engineer and build a truly customcrafted application in a timely, cost-efficient manner, whilst maintaining its core mandate of offering quality products, customer satisfaction, service and value. SE Industries’ space solutions provide clients with flexibility, complete professional service, customization and a faster, smarter, greener way to build.

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CO M PA N Y PRO F I LE

MAINTENANCE SOLUTIONS SE Industries’ maintenance division attends to all gardening requirements, whilst the construction team provides solutions to all aspects of building requirements, including painting, electrical, tiling and plumbing.

QUAYSIDE SOLUTIONS SE Industries offers unique quayside support to vessels entering the Port of Coega and provide a one-stop solution for all aspects of procurement, catering, health and safety. Projects completed on oil rigs throughout South Africa.

WALL & ROOFING SOLUTIONS A subsidiary of SE Industries, Masslite Roofing Solutions offers a complete solution to ‘daylight harvesting,’ with the extensive range of Polycarbonate material, i.e. multiwall, roof sheets and solid flat sheets. There are various colours and profiles from which to choose. SE Industries is service-orientated and provide solutions to a diverse market including government, medical, recreational and hospitality sectors throughout Southern Africa. They commenced operation in the Eastern Cape in January 2006 and have since been growing from strength to strength. This dynamic company takes great pride in delivering service excellence. We have expanded and have moved premised to Unit B, Old Cape Road, Hunters Retreat, Port Elizabeth.

FOR MORE INFORMATION, CONTACT: (t) 041 453 9835 or 0861 000 818 (e) info@seindustries.co.za admin@bestpolycarbonate.co.za (w) www.seindustries.co.za

SUPPLIERS OF TRANSLUCENT POLYCARBONATE SHEETING CORRUGATED BIG 6 PROFILE | SOLID & EMBOSSED POLYCARBONATE SHEETS | IBR PROFILE SHEETS

APPLICATIONS: WAREHOUSING | SKYLIGHTS | WALKWAYS CARPORTS | GYMNASIUMS | GREENHOUSE COVERINGS | INDOOR PARTITIONS

INSTALL POLYCARBONATE ROOF SHEETING HARVEST THE DAYLIGHT AND SAVE ENERGY CALL US FOR COMPETITIVE PRICING TEL: 041 453 9835 or 0861 000 818 EMAIL: info@seindustries.co.za or admin@bestpolycarbonate.co.za WEB: www.seindustries.co.za

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Design24 top designs announced

Media24 reveals top three proposals to reimagine the façade of the landmark Naspers Centre

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edia24 has revealed the judges’ most favoured designs submitted for Design24, a design competition seeking concept ideas to reimagine and rejuvenate the Naspers Centre on Cape Town’s Foreshore. The prize money of R320 000 was to be awarded to one winner and two runners-up who would receive R200 000, R80 000 and R40 000 respectively. However, none of the designs submitted met all the criteria, and thus do not qualify for an award. Although there was no clear winner, Media24 decided to reward the three favoured designs. “Some of the entries truly reimagined the iconic Naspers Centre, so even though there wasn’t a clear winner, we decided to split the prize money equally between the top three entries as recognition of their artistic contribution,” said Media24 CEO Esmaré Weideman.

THEY ARE, IN NO PARTICULAR ORDER: • Cape Town-based Tsai Design Studio, whose design, entitled 'Urban Sculpture,' imagined a folded sheath wrapped around the building, with a prominent media wall facing Walter Sisulu Avenue. • MLB Architects, based in Cape Town and Johannesburg, whose design, entitled 'Reimagining an Icon,' used glass, mesh and green planting to create an entirely new silhouette for the building. • Pretoria-based DBM Architects, whose design, entitled 'Roots,' imagined tangled roots reaching up the full height of the building, in reference to Media24’s 100-year history in Cape Town.

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Anika Ebrahim, head of Corporate Communications for Media24, said, “The curators and judges were asked to find three winners from over 90 submissions. While most submissions met different aspects of the brief, we were looking for ideas that would completely reimagine this 52-year old icon. The primary intention behind Design24 was to find striking, inspiring ideas that would transform our head office building to reflect a multiplatform media company on the move. The designs selected have done that, albeit falling short of the cost criteria.”

Eight finalists and ten ‘cool ideas’ from the entries were revealed and displayed and the top three entries were announced at a function on Nasdak, on top of the Naspers Centre, on Friday night. Weideman said, “We thank the many architects, graphic designers, artists, industrial designers, urban planners, students and even a journalist who took part in this exciting competition. We were inspired by the imagination and creativity of many of the designs. Our implementation team will now be tasked with the challenge to find the best design solution – which could include elements of the top three designs – within our modest budget. Though this is the end of the competition, it is only the first phase of the exciting journey to reinstate our building as an icon of the future Foreshore.”

“John, Paul George and Rita”

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Rita? It simply doesn’t have that ring, does it? Finding the right partner in any venture is crucial. The right addition brings insight, creative energy and augments the strengths of the team with these unique talents. So it is when you engage the services of Stalcor. Yes, you’re getting the finest range of stainless steel and aluminium available, but you’re also getting as partners, a 24-hour a day team of highly experienced, committed experts. People who will ensure that downtime is kept to an absolute minimum and that you are fully aware of the incredible range of options and resources you have at your command. We offer a total solution to improve your productivity. It’s a smart partnership that will make you a hit with your accountants. Call us to find out the details because the right partner can make all the difference. For more information visit www.stalcor.co.za or call Stalcor: Germiston 011 871 6900 Cape Town 021 928 2500 KwaZulu Natal 031 719 1000

N E WS

The competition drew 94 entries from architects and designers across South Africa, in response to a brief that called for ideas to rejuvenate the building’s exterior façade. Entries were judged by two panels and were assessed against six criteria: aesthetic value, sustainability, cost, technical feasibility, buildability and, lastly, a reflection of all four World Design Capital themes. Design24 is an official World Design Capital project.


I N S U L ATI O N

Saint-Gobain Isover Insulation Solutions For excellent thermal and acoustic insulation solutions that improve the energy efficiency of buildings.

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uildings typically account for 40% of all energy consumed, yet the potential to save energy is huge. By using thermal insulation and energy saving techniques it is possible to save up to 78% of a building’s energy consumption for heating and cooling. Saint-Gobain Isover is a leader in the manufacture of thermal and acoustic insulation and our mission is to produce energy efficient insulation solutions that improve buildings’ thermal and acoustic comfort, while helping to protect the environment by reducing greenhouse gas emissions. With over 55 years’ experience in the South African insulation market, Isover’s two local manufacturing sites employ over 240 people, producing a wide range of insulation materials including Glasswool, Ultimate and Expanded Polystyrene. In 2008, Isover South Africa upgraded our production facilities, installing the latest TEL fiberising technology, which has improved the quality and performance of our fibres and has increased our production capacity by 30%. Glasswool, Ultimate and Expanded Polystyrene are manufactured according to ISO 9001 Quality Management System standards and our Springs plant achieved ISO 14001 certification in 2012. Energy efficiency improvements have been one of Isover’s main focuses for many years and in comparing the tons of glasswool produced in 2000 to the production today, energy consumption has dropped by 20% per ton of product with an equivalent reduction in CO2 emissions. We have lowered our water consumption per ton of glasswool produced by 30% by the use of closed circuit systems and investing in new equipment that consumes less water. Glasswool can be compressed by a factor of up to ten, which saves on storage and reduces transport costs. Glasswool is one of the most popular, widely used, environmentally friendly, stable and sustainable insulation materials available today. It is made from a combination of naturally occurring silica sand, fluxing agents and up to 80% recycled glass. Our glasswool range provides excellent thermal and acoustic insulation solutions that improve the energy efficiency of buildings. Glasswool has a zero Ozone Depleting Potential (ODP) and no CFCs or HCFCs are produced in the production process. Sagex is Isover South Africa’s Foams division, manufacturing a range of expanded polystyrene, which offers a choice of lightweight, high compressive strength, and water-resistant insulation solutions for use in industrial, commercial and domestic applications.

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Sagex Expanded Polystyrene is recyclable and is manufactured using a pentane blowing agent which ensures that the product is CFC and HCFC free. Over their useful life, Isover’s Glasswool and Expanded Polystyrene insulation products save more than 100 times the energy consumed and CO2 emitted in their manufacture, transport and disposal. For more information, visit www.isover.co.za or download the Isover app from the app stores.

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Cnr Berkley and Bax Roads, Maitland 7405


I N S U L ATI O N

Why Eco-Insulate for housing? Developers and project managers in the various housing sectors are increasingly seeking one-stop solutions to meet the requirements of SANS 10400 XA regulations, to ensure their projects are energy efficient and provide comfortable living spaces for the owners.

Eco-Insulation on site at a multiple-unit gap housing project. © Gareth Griffiths Imaging.

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n addition, sensitivity to the requirements of voluntary green building codes of practice are important, especially among sustainability- and future-focused developers. The launch of the South African Green Star Multi Unit Residential Tool is just such a case in point.

As a form of energy, heat always flows to a cooler area, escaping out of the building in the winter and entering the building during summer. Eco-Insulation creates a thermal barrier that controls temperature all year round,” he says.

The regulations can, however, be confusing. Richard Ellis, the general manager of popular green insulation brand, EcoInsulation, explains the fundamentals.

IN ADDITION, THE DEVELOPER CAN ADD THE FOLLOWING BENEFITS TO THE NEW HOME, WITHOUT BREAKING THE BANK TO DO IT:

“Insulate above the ceiling, under the floor or inside the walls. This enables passive control of indoor climate and hence saves energy. For the property owner, this means less electricity or gas usage and therefore real savings in operating expenses. For the developer, insulation correctly installed means total compliance with the specified R-value for the roof, under national building regulations. A product such as Eco-Insulation resists the flow of heat, so less heat will be lost from the home or office in winter and less heat will enter the building during summer. In turn, this leads to healthier living conditions and positive outcomes for the occupants.

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• As well as saving energy, Eco-Insulation in particular also acts as a sound suppressor. In modern noise-laden environments, more homeowners are soundproofing their homes. • A well-insulated home will increase its overall comfort and add to its resale value. In today’s times of rapidly rising energy costs, it pays now more than ever to insulate and make your home an energy saving home.

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“Eco-Insulation not only offers the ultimate climate control, it is also the ultimate green building product, too, helping the environment and protecting you and your family against the intensifying effects of global warming. Visit our website find out about the ultimate green product. Eco-Insulation is also listed on the Specifile online service, where the project manager may draw further technical information,” says Ellis. “Ask to see an up-to-date Product Compliance Certificate next time you call for an insulation quote. We were one of the first suppliers to qualify,” he added.

I N S U L ATI O N

ULTIMATE GREEN BUILDING

FOR MORE INFORMATION, CONTACT: (t) 021 555 3766 (e) info@eco-insulation.co.za (w) www.eco-insulation.co.za

www.brinno.com

2013 Best of What’s New Award by Popular Science

COST-EFFECTIVE TIME LAPSE/RECORDING CAMERA. Record the months/years of your construction project with a touch of a button • Production procedure, events/functions & quality control documenting • Easy installation • Weatherproof casing • No messy power cables • Battery life up to 230 days with 4 x AA batteries

RETAIL AND ON-SITE INSTALLATION

Tel: 011 262 4151 (office) Charles: 084 211 0403 Email: charles@frontier-electronics.co.za Philip: 083 273 0807 Email: chensouthafrica@yahoo.com.tw


C E M E NT & CO N C R E TE

Bayferrox pigments helped create concrete ‘tree trunks’ A range of Bayferrox pigments, produced by Lanxess Inorganic Pigments, was extensively used in the design and construction of Plaza de la Libertad, a new landmark and iconic structure in Medelin, in central Colombia.

Two views of the imposing twin-towered Plaza de la Libertad in Colombia, which, through the use of concrete coloured with Bayferrox pigments, shows “human kind in harmony with the environment.”

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anxess Inorganic Pigments – based in Germany – is one of the largest pigment suppliers to the global construction industry. Chryso Southern Africa is the sole distributor of Lanxess inorganic iron oxide pigments for the South African construction industry and has a colour laboratory in Jet Park that can measure the colour strengths of pigmentation, and provide customers with specifications to colour-match available concrete masonry production lines at competitive rates Medelin’s 12 000m2 Plaza de la Libertad features two towers (24- and 17-storeys high) resembling tall tree trunks, designed to blend in with the surrounding forest’s trees and their trunks and bark. The design concept of architect and interior designer, Alejandro Toro Posada – which liberally features concrete coloured with Bayferrox pigments to add natural inspiration – also employs the building’s wings as branching structures emanating from the giant ‘trees.’

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The structural elements of Plaza de la Libertad are based on a temperature-regulating and extremely weather-resistant concrete coloured with 60 metric tons of Bayferrox 918 LOM yellow pigments in the main building, and seven metric tons Bayferrox 130 M (red) and 318 M (black) pigments in the auditorium. A major benefit of using integrally coloured concrete is that the façade will require no follow-up maintenance. Designer, Posada, adds, “Furthermore, the façades have been designed to conserve resources, reducing conventional air conditioning and lighting costs by around 40%.” The avant-garde building accommodates government institutions, a business hotel, TV studios, businesses, cultural centre, open-air theatre and exhibition halls.

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C E M E NT & CO N C R E TE

Described as a ‘place of expressive power,’ it has won top prize in a major international competition organised by the National Association of Architects. Hannes Engelbrecht, Chryso S.A. Business Manager: Concrete Aesthetics, says there are some vital factors to consider when producing pigmented concrete: • Cement: Portland cement can vary significantly in colour from light to dark grey. This change in colour can influence the final colour of pigmented concrete. “That is why it is important to use the same cement throughout. The higher the cement content, the more intense the colour,” Engelbrecht explains. • Aggregates: The colour of aggregates also influences the ultimate colour, so it is important to ensure that the entire surface area of the aggregate is coated with the pigmented cement paste for colour uniformity. • Mixing water: Water dilutes the colour of the pigments in the mix and excess water evaporates from concrete, leaving behind pores that scatter incidental light and lighten the colour of the pigment.

• Dispersion: The pigment must be mixed with the aggregate before the cement is added. • Temperature during drying: In higher temperatures, fine crystals develop in the cement matrix and determine how the light that falls on the concrete is scattered. Smaller crystals produce lighter pigment. • Efflorescence: Admixtures with high levels of calcium chloride can cause primary efflorescence. All Bayferrox pigments are UV-stable and comply with quality standards EN 878 (the use of pigments for colouring building materials), and ASTM C979 (pigments for integrally coloured concrete), and carry the CE quality mark on their packaging. Lanxess operates from sites in Germany, Brazil and China, as well as additional mixing and milling plants in Australia, China, Spain, the UK and USA. Copies of Chryso’s informative leaflet, Pigmented Concrete, can be obtained by phoning Hannes Engelbrecht on 011 395 9700, or email hannes@chrysosa.co.za. Visit the website, www.za.chryso.com for more details.

• Formwork: The type, colour and condition of formwork can influence surface colour. Formwork with different rates of absorption will create surfaces with different colour shades.

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C E M E NT & CO N C R E TE

Unlimited design freedom just one of precast cladding’s advantages Precast concrete cladding provides the designer with substantial freedom in the choice of form, texture, and appearance, because concrete’s flexibility allows for limitless scope in expression and character, says Bryan Perrie, MD of The Concrete Institute.

Much of the iconic Sydney Opera House is covered with ceramic tiles, but underneath the tiles are about 2 000 precast concrete segments.

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recast concrete panels are reinforced concrete units available in a variety of mixes, colours and finishes, such as formed, acid-etched, smooth or coarse ground, rubbed, polished, grit or sand-blasted. Designers revel in the fact that complex and innovative designs can be incorporated using an infinitely mouldable concrete mix.

One of the main distinctions between precast concrete cladding and tilt-up concrete panels is that the precast elements are usually cast in a specialised manufacturing plant, away from their final location. Tilt-up panels are usually cast horizontally at or near their final destination, and then lifted into place.

In specifying precast concrete as cladding material, the designer gives the building contractor the opportunity to have the building ‘envelope’ moved off site to a precast facility where a skilled workforce can pay full attention to the demands for accuracy and quality of workmanship in the finish.

The precast panels are often cast face-downwards in purposemoulds, normally made of steel, often with rubber, timber or fibre glass inserts forming a pattern. Prior to the concrete being placed, a steel reinforcement cage is placed in the mould. Through the insertion of mats or rods in the base of the mould, different designs and effects can be created.

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C E M E NT & CO N C R E TE

Precast cladding offers a wide range of finishes. In off-the-form finishes, the mould detail is mirrored in the concrete surface and can produce, for example, board-marked finishes, ribbed finishes, or rope-patterned finishes. Exposed aggregate finishes, on the other hand, reflect the natural colour of the aggregate. Other finishes available include polished reconstructed stone finishes, or panels can be given a polished stone or ceramic tile finish.

ARCHITECTURAL CONCRETE CLADDINGS GENERALLY FALL INTO TWO CATEGORIES: • Claddings that purely serve as enclosures: in this application the claddings are applied as self-finished panels or as backing components to other façade materials, such as brickwork; or • Claddings that form an integral part of the framework of a building and therefore perform an enclosing, as well as a structural function. Cladding panels can be manufactured in a variety of shapes and sizes, but are mainly applied as storey-height or spandrel panels: the storey-height units span from floor to floor and the spandrel version forms a sill wall beneath fenestration strips. Storey-height panels can be manufactured with apertures for windows and doors later installed on site. Window frames can also be attached in the cladding manufacturer’s plant and applied paint finishes can be carried out before the panels are delivered to site. Apart from its major cost benefits, precast cladding offers property owners long-term durability and minimum maintenance without the need for frequent cleaning.

THE INHERENT CAPABILITIES OF CONCRETE ALSO HELP TO MAKE PRECAST CLADDING A POPULAR CHOICE AS A RESULT OF: • Faster programme times – unaffected by weather or labour shortages • The early enclosure of the dry envelope enables follow-on trades to commence their work sooner • A high standard of workmanship in factory conditions and reduces the potential for accidents • Exceptional fire resistance • Superior acoustic quality that will help keep traffic and industrial noise from the office environment • Control of radiation and conduction of heat and prevents air leakage • The use of concrete sandwich panels with incorporated thermal insulation in colder climates keeps the office environment warm. Harsh coastal environments may threaten the lifespan of some cladding materials, but decades-old concrete structures (such as the Port Elizabeth Post Office building, north of the CBD and virtually next to the corrosive influences of the ocean) bear testimony to concrete’s exceptional durability. The façade of the main administrative building and Council Chamber wing of the Johannesburg Civic Centre (a landmark near the top of Rissik Street) still looks attractive after more than four decades since it was originally clad. Large precast concrete panels, 8,7m high and 2,1m wide and weighing 6 800kg, were used as the walls of the Council Chamber. The Concrete Institute recommends that input is obtained from an experienced precast specialist in the early decisionmaking stages of a cladding project. (Information supplied by The Concrete Institute, www.theconcreteinstitute.org.za).

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G R E E N ROO F I N G

Sika’s Green Roofing System benefits Eastern Cape industry When construction of a new production warehouse for German company, Frederich Booysen, commenced in East London, Sika’s Sarnafil Roofing System was specified to supply this state-of-the-art building with a single ply thermoplastic roof.

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he R180m facility, situated in East London’s Industrial Development Zone (ELIDZ), will supply complete exhaust systems to the nearby Mercedes Benz Plant.

Locally based architectural firm, Smale & Partners, awarded the main contract to NMC Construction Group. The entire roof of this almost 9 000m2 structure was waterproofed with mechanically fastened Sika Sarnafil thermoplastic sheets welded together using an automatic hot-air welder, the Sarnamatic. Common causes of leaks in many waterproofing membranes are faulty seams on which sealants, adhesives or tapes have been used. However, in the case of Sika Sarnafil, once the sheets have been heat-welded together, a monolithic layer of material is formed that is impervious to moisture infiltration.

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Sika Sarnafil, worldwide market leader in thermoplastic roofing and waterproofing membranes, was awarded the 2012 RoofPointTM Excellence in Design Award for a vast reroofing project for General Motors in Michigan, USA. As one of 100 entries, Sika Sarnafil won the award for demonstrating excellence in materials management, including material recycling, project waste management and for the use of environmentally preferable construction materials. Having been used extensively in Europe for over 40 years and in the United States for over 25 years, Sika Sarnafil has been available in South Africa since 2008. As testimony to the durability of the product, some Sika Sarnafil roofs in Europe have lasted for more than 40 years without needing replacement.

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G R E E N ROO F I N G With the Eastern Cape recording some of the strongest winds along South Africa’s coastline, it was imperative that the roofing on this large structure be capable of withstanding these forces of nature. Sika Sarnafil is designed to withstand winds of up to 250km/hr, that is, a force 2 hurricane. As was expected, regular winds gusting up to 75km/hr were experienced during this project, resulting in many hours of lost production. Since a Sika Sarnafil roof provides excellent thermal efficiency, it reduces the energy consumption in a building by decreasing cooling costs during summer and heating costs during winter. On a larger scale, these roofs reduce the ‘urban heat island effect’ found in most cities where the ambient temperature can be as much as 10 degrees hotter than the surrounding areas. This new East London warehouse with its 20 year guaranteed Sika Sarnafil Roofing System, conforms to the same roofing specifications of all Frederich Booysen’s existing factories, worldwide. Due to its proven track record overseas, Sika is confident that many more South African buildings will be topped by an aesthetically pleasing, environmentally friendly Sika Sarnafil roof. As the Senior Vice President of Sika, Brian J. Whelan said upon receiving the 2012 RoofPointTM Excellence in Design Award, “Sika Sarnafil is committed to helping contractors, building owners and government to reduce their environmental footprint and achieve their sustainability goals.” For more information on Sika products and systems, visit www.sika.co.za.

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H E A LTH & SA F E T Y

Excavation Safety by SafeBuild In almost any construction scenario, there will come a time when earth needs to be removed or moved in order for the project to progress. Excavating is one of the most hazardous construction operations conducted on site. If a collapse occurs whilst persons are working in an excavation, the result is normally catastrophic. By Neels Nortje, Health & Safety Manager, Master Builders Association KwaZulu-Natal

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he Occupational Health and Safety Act 85 of 1993 requires that all excavation work must be carried out under the supervision of a competent person who has been appointed in writing. When explosives are involved, then a method statement is to be developed in accordance with the applicable explosive legislation by a competent person. The supervisor must make sure that the excavation work that involves explosions must be carried out in terms of this statement. Inspections of excavations must be made before every shift, after rain, after blasting, after ground fall and after any damage. The appointed competent person must always keep the register up to date according to the inspections that are conducted. Excavation work presents serious hazards to all workers involved. Cave-ins pose the greatest risk and are much more likely than other excavation-related accidents to result in worker fatalities. In order to prevent this from happening, excavations must be adequately shored, braced and supported, or the sides of the excavation must be sloped to at least the maximum angle of repose measured relative to the horizontal plane. It is important to note that if the excavation is in stable material and is not shored or braced and it is not possible to apply angle of repose, then persons may only enter the excavation after a competent person has examined the excavation and given written permission that it is safe to do so. Adequate and sufficient means of access and egress to and from the excavation must be provided. This access must not be further than 6m from the point where any worker within the excavation is working. If the public is exposed to the excavation then it must be adequately guarded with a barrier or fence of at least 1m in height and suitably illuminated at night with sufficient warning notices placed at the excavation. Make sure that warning signs are positioned next to excavations within which persons are working or carrying out inspections or tests. Excavated material must be placed a suitable distance away from the excavated area, at the lowest side of the excavation and vehicles must be so directed not to come in close proximity of the excavation. All excavation work must be conducted in terms of the Occupational Health and Safety Act, applicable regulations and method statements. For more information on excavation safety and other related safety topics visit www.safebuild.co.za.

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BOOK NOW!

For more information:

info@woodexforafrica.com +27 (0)21 856 4334


E V E NT S

EcoAfribuild 2014: Leading the eco-friendly building market EcoAfribuild 2014 is leading the transformation to eco-friendly and sustainably green building and construction on the continent. Co-located with Interbuild Africa 2014, the most iconic building and building services exhibition in Africa, taking place 20-23 August 2014, EcoAfribuild will focus on the next generation of building and infrastructure with a spotlight on energy efficient, resource efficient and environmentally responsible building design, materials, and energy services. “The eco-friendly construction market is growing rapidly as people realise the benefits of eco-friendly building,” says Gary Corin, Managing Director of Specialised Exhibitions Montgomery. “In fact, the Department of Trade and Industry has announced plans to make changes to the energy efficiency regulations that will make it compulsory for new buildings to be designed to minimise energy consumption,” he points out. EcoAfribuild 2014 will provide exhibitors with an ideal platform to showcase the latest eco-friendly building solutions while networking with industry peers. Visitors will be able to see demonstrations of building designs that reduce heat loads, maximise natural light and promote the circulation of fresh air, as well as the use of energy-saving air-conditioning and lighting. The show will also focus on environmentally-friendly and nontoxic materials, the reduction of waste and recycled materials, water-efficient plumbing fittings, water harvesting and the use of renewable energy sources. Supported by many industry-leading associations, EcoAfribuild is co-located with Interbuild Africa 2014, one of most renowned building and building services industry events with a fourdecade legacy. Moving through to the next phase of its history, Interbuild Africa has recently undergone a dramatic renovation, including a complete rebrand and other key changes that will provide greater value to both its exhibitors and visitors. Interbuild Africa and co-located shows – Glass Expo Africa Plumbdrain Africa, EcoAfribuild, and Hardex Africa – constitute the biggest building and building services exhibition in Africa. The combined shows will provide some much needed support to the local building industry by creating an enabling environment for business networking, product and equipment purchases and business development. Last year Interbuild Africa welcomed more than 9 000 visitors, and this year, the event, along with its co-located shows will see a drastic overhaul in meeting and exceeding industry standards, as well as the expectations of both exhibitors and visitors. “The built environment affects us all, including our economies and the environment – that is why we must drive transformation in Africa towards sustainability,” says Corin. “EcoAfribuild will show how it is possible. It is logical for delegates and exhibitors to get behind this year’s show and understand more about how eco-friendly construction is the way of the future,” he concluded.

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EcoAfribuild 2014 will take place from 20-23 August 2014 at the Johannesburg Expo Centre in Nasrec. For further information or to book your stand, visit www.ecoafribuild.co.za.

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SAVE THE DATE!

In partnership with


E V E NT S

Totally Concrete brings sustainability and innovation to the African construction marketplace Infrastructure spend is increasing across Africa and the Totally Concrete Expo, taking place in Johannesburg from 26 to 28 May 2014, is Africaâ&#x20AC;&#x2122;s leading platform for access to major projects across the continent.

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ith over 4 000 participants from more than 25 African countries, the Totally Concrete Expo connects the entire cement and concrete ecosystem with public and private sector project owners and investors to promote construction project completion on budget and on time. In Southern Africa alone cement consumption is predicted to increase to more than 18.1 million tonnes by 2018. The South African government plans to spend in excess of R4 trillion on a massive state-led infrastructure drive over the next 15 years and with new manufacturing plants being built in the DRC, Zambia and Zimbabwe, business prospects for construction, cement and concrete are brightening across the southern continent, with the rest of sub-Saharan Africa not far behind. In 2014, the Totally Concrete Expo sets the pace for African development by bringing together the leading industry experts that are driving sustainability through innovation in the marketplace. Santie Gouws, Managing Director of Concrete Growth in South Africa, will discuss how concrete is now contributing to green market power solutions with a case study on concrete wind turbine masts. Eng. Wolfram Schmidt, Researcher in the Department of Safety of Structures at the Federal Institute for Materials Research and Testing in Germany (BAM), will share the findings of an Africa-wide cement competency testing programme, and David Lambertin, Director at the Centre dâ&#x20AC;&#x2122;Energie Atomique (CEA) in France, will offer the latest information on geopolymer applications for nuclear developments. Totally Concrete provides participants with the tools and knowledge to complete projects of all sizes on budget and on time, and delivers the next generation skills and technology needed to construct the Africa of tomorrow. For more information, visit www.totallyconcrete.co.za.

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SA Roofing May 2014 | Issue: 59  

SA Roofing is the only publication in South Africa that is dedicated exclusively to the residential, commercial and industrial roofing and r...

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