Green Home Issue 25

G

R

E

E

N

HOME living informed today

Issue 25 R29.00 incl VAT 9 772223 540014

SUBSCRIBE

+WIN

08025

RAINWATER HARVESTING

ECO PRODUCTS

SOLAR & GAS WATER HEATERS

INSULATION: THERMAL BRIDGING

Traviloc Flooring has an older brother!

Tr a v i l o c – I s o c o r e X L ; th e L o o k , th e F e e l, th e Pe r fo r ma n c e .

Offering a product representative of exactly what architects, designers, contractors and home-owners are looking for in flooring today; Traviloc Isocore XL is adding a whole new dimension to flooring.

The patented IsoCore technology is the backbone of the floor resulting in the most stable product in its category. The larger format Traviloc XL also uses a new embossing technique in its vinyl top layer providing a natural and authentic look and feel. The unique Drop-Lock technology allows for quick and easy installation.

M e e t t h e o l d e r b r o th e r , T r a v ilo c – Is o c o r e XL . .

Johannesburg: Andrew Kirkwood, 011 453 0296 084 504 7465 Kwa Zulu Natal: Mike Richardson, 082 901 3229 Unit 5, Route 24, Herman Rd, Meadowdale, Johannesburg W W W . TR A V I A TA . C O . Z A

World First – Vinyl Flooring comes of age!

Traviloc – Isocore; the Look, the Feel, the Performance! This product represents the culmination of consultation with the global contract community, a distillation of what architects, designers, contractors and end users demand from flooring today. Larger plank and tile formats that compliment open commercial environments. The latest embossing techniques for a more natural and authentic look. Very quick and reliable installation featuring a world patented drop lock system. Hygienic and easy to maintain surfaces facilitated by the Ceramic Bead coating which is treated with Ultra-Fresh.

Traviloc – Isocore combines a number of cutting edge technologies to produce a floating floor system that matches the look of natural wood while delivering exceptional durability and comfort. The patented “Isocore” technology

www.greenhomemagazine.co.za

provides the backbone of the new flooring. A pioneering new development, this closed-cell PVC structure is light yet strong and stable, rigid without being brittle, making Isocore durable, easier to install and more aesthetically pleasing because it virtually eliminates telegraphing from subfloor irregularities. Isocore is also impervious to moisture making the new Traviloc product 100% waterproof.

Traviloc – Isocore also comes with an integral, factory applied, underlay for increased comfort, warmth and noise absorption. Isocore’s 0,55mm commercial grade wear layer offers durable protection against the scuffs, chips and indentations which often plague real wood surfaces. In addition to the highly durable wear layer, Isocore also has a UV cured Urethane coating that incorporates Ceramic Bead particles

for added wear resistance. The floor is also treated on the top and bottom surfaces with Ultra-Fresh, which inhibits the growth of odour and stain causing bacteria and fungi, providing an easy to care for and hygienic surface.

Because the Isocore contains no plasticisers at all, the new Traviloc – Isocore flooring is the most dimensionally stable product in its category. Tested at operating temperatures up to 40deg.C it is literally inert. The omission of plasticisers and the use of 100% virgin vinyl in the top and wear layers add significantly to Isocore’s green credentials. There are no phthalates or heavy metals in the product and it is 100% recyclable at the end of its life!

Traviloc – Isocore is a whole new dimension in flooring!

G R E E N HOME

1

A WORD FROM THE

EDITOR

Dear Reader, With a clear focus on green residential building we will be republishing our Green Home Guide pull-out-poster showing various (but not all) interventions you can make to have your home function more efficiently, advance your self-sufficiency, and lower your cost of living. See our centre spread.

We are super-pleased to bring you two beautiful homes by the Nico van der Meulen architectural firm – see Blair Atholl House and Kloof House as the opening features. You’ll find it interesting to note how many green home interventions have been incorporated in these projects to enable their occupants to live greener – and in many cases these are passive designs, meaning they are inherent in the building.

This theme of passive interventions is continued in our discussion about how to avoid thermal bridging – the term given to what happens when a gap in your insulation allows heat or cold to pass through. A common example is your windows and while simple interventions like curtains can help to cut the bridge, have a look at the cutting-edge solutions discussed on page 28.

A major consideration when building is your choice of materials which, apart from your operations, accounts for the primary impacts of the building. You don’t have to go with conventional choices either – see our eco-building materials showcase on pages 16-21.

Water is the issue of the day, and it’s not just a problem for us in South Africa. I recently travelled to Namibia where the goal is to reduce water consumption by a whopping 30%.

Beat the odds by harvesting your own water – see rainwater harvesting guide on page 22, something every household should do.

Enjoy.

Use of Sustainable Paper Alive2green is committed to using sustainable paper and printing products and services, and to this end Alive2green prints with a black woman-owned printer, FA Print. FA Print prints alive2green publications on paper supplied to it by an FSC certified supplier. FA Print is taking steps to become FSC certified at which point this publication will become entitled to carry the FSC logo.

Gordon EDITOR DIVISIONAL HEAD OF SALES SALES EXECUTIVES PROJECT MANAGER CLIENT LIAISON OFFICERS MARKETING MANAGER DESIGNER EDITORIAL DIRECTORS ACCOUNTS AND ADMINISTRATION WEBSITE PHYSICAL ADDRESS COMPANY REGISTRATION NUMBER VAT NUMBER

Green Home magazine is audited by the ABC IMAGES AND DIAGRAMS

DISTRIBUTION MANAGER ADVERTISING ENQUIRIES PRINTER

Gordon Brown Annie Pieters Jacques Gerber, Zaida Yon Esther Kabaso Natasha Keyster Nabilah Hassen-Bardien Shanice Daniels gordon.brown@alive2green.com Gordon Brown, Lloyd Macfarlane, Andrew Fehrsen Chevonne Ismail www.alive2green.com www.greenhomemagazine.co.za Cape Media House, 28 Main Rd, Rondebosch.

TEL: 021 447 4733 FAX: 086 694 7443 2006/206388/23 4130252432 First Published July 2011 All rights reserved. No part of this publication may be reproduced or transmitted in any way or in any form without the prior written consent of the publisher.

The opinions expressed herein are not necessarily those of the publisher or the editor.

All editorial contributions are accepted on the under­ standing that the contributor either owns or has obtained all necessary copyrights and permissions. Publishers do not endorse claims by advertisers.

Space limitations and source format have affected the size of certain published images and/or diagrams in this publication. For larger PDF versions of these images please contact the Publisher.

Edward MacDonald, distribution@alive2green.com sales@alive2green.com FA Print

PUBLISHER

2

G R E E N HOME

www.greenhomemagazine.co.za

www.greenhomemagazine.co.za

G R E E N HOME

3

July / August 2016

CONTENTS

THE WINTER ISSUE

18

25

4

31

08

HOUSE FEATURE House in Blair Atholl

08

11

HOUSE FEATURE Kloof House

11

18

GREEN BUILDING MATERIALS Some of the best products on the market

20

GREENING GUIDE POSTER Ways to make your home eco-friendly

25

RAINWATER HARVESTING Mother Nature’s economical alternative

31

THERMAL BRIDGING Insulate yourself the right way this season

37

WATER HEATERS: GAS VS SOLAR Everything you need to know

37

NE I L N O SHOP Effective Eco friendly insect & Odour Control

Why Ecomist?

Why an ECOMIST

Ecomist is the most effective insect and odour control system used extensively in all commercial, industrial & domestic establishments.

franchise?

• Annuity Income • Global experience Ecomist Insect Killer has used natural pyrethrin to effectively control insects for decades.

Natural pyrethrin is bio-degradable, • Eco friendly insect & odour controldecomposing rapidly in the environment, making it an excellent and safe choice for • Wide market acceptance controlling pests.

Pyrethrin comes from the Chrysanthemum flower which has a unique combination of insecticidal properties and is one of the safest insecticides known. Pyrethrin, is effective against a wide range of insect pests including flies, ants, mosquitoes, cockroaches, fleas, etc.

How do I benefit as an ECOMIST franchisee?

• Product reliability

Ecomist uses a unique dispensing • Low fixed costs system which is battery • Rapid technical & marketing operated and emits the pyrethrin aerosol atuptake set time intervals experience and dosages.

It is interchangeable between insect and odour aerosols.

• Regular innovative product introduction Ecomist has over a 100 different fragrances to choose from.

securing you customer base

CALL US ON

0861

ECOMIST

3 2 6 6 4 7

www.ecomist.co.za INSECT & ODOUR CONTROL | HYGIENE | FRAGRANCING

www.greenhomemagazine.co.za

G R E E N HOME

5

6

FEATURE

Bold Modern Architecture Our Feature Houses within this issue of Green Home magazine, come from Johannesburg-based Nico van der Meulen Architects.

The architectural practice was established in 1984 by owner and founder Nico van der Meulen and his wife, Santa. Nico grew up on a farm near the border between South Africa, Botswana and Zimbabwe, where he spent most of his childhood building bridges and structures using found materials. This was the first expression of Nico’s passion for Architecture. He initially studied civil engineering, explored project management and finally registered as a professional Architect.

Under Nico’s guidance and with his two sons following in his footsteps and joining him, the firm has grown into a family legacy. Each member of the family has established their own reputations within the design industry for their talents in architecture, interior design, decor and art.

House in Blair Atholl Hill and Kloof Street House are contemporary designed homes that have incoporated both breathtaking beauty and eco-building initiatives.

Underfloor heating and cooling, as well as heat pumps were installed for energy saving and cost-effective purposes. This required the inclusion of Polystyrene under floor insulation, reducing the need for heating during winter months.

The design strategy was modeled around sunlight. South-facing, double-glazing glass was installed and the homes are north-facing, allowing for natural light and warmth to enter the home during the day and in winter. Passive design principles were implemented through the study of sun angles vs shading devises, the correct placement of windows and doors, incorporating well-insulated materials into the design.

Water-saving rainwater harvesting and grey water recycling systems have been implemented to reduce council water usage. Wherever possible, natural materials were used to reduce the carbon footprint of the projects. The eco-technology utilised within the homes takes the environment into account but also ensures that the overall running costs of the home are significantly reduced.

www.greenhomemagazine.co.za

G R E E N HOME

7

FEATURE

H

HOUSE IN BLAIR ATHOLL

ouse in Blair Atholl is one of the most recently completed projects by the highly acclaimed Nico van der Meulen Architects.

This luxurious contemporary farmhouse is situated within a secluded golf estate located between Pretoria and Johannesburg, South Africa. Designed by Werner van der Meulen of Nico van der Meulen Architects, this doublestorey home boasts nearly 750 m² and is surrounded by serenity and tranquility. Free from high boundary walls and electric fencing, this is a design with a difference. With unrestricted views of the countryside, the expansiveness of this home is certain to catch your attention as you approach the house.

The brief called for a contemporary, practical home that makes provision for outdoor living with an emphasis on entertaining.

Due to the form-follows-function approach of the design, this modern family home is spacious

8

and uncluttered from unnecessary decorative elements.

The design concept is undoubtedly a strong one which speaks for itself and, while Werner van der Meulen was restricted by the estate’s rules (which included making use of pitched roofs and specific natural materials), it was in fact these very parameters which led to the concept of a contemporary farmhouse. The floating double pitched slate roof also played a huge role in the development of the concept and reinforces the contemporary nature of the design.

Orientating the house northwards allows for the home to be naturally lit all year round and provides expansive views of the garden from nearly every room. While the overhangs provide protection from the sun during the summer, they also ensure that the sun still penetrates the rooms during the winter months.

The double-volume entrance hall is partially surrounded by glass and bordered by two double

garages on either side. The symmetry of the solid timber garages highlights the transparency of the house, as views of the garden captivate you even before you have entered. Enveloped in natural wood, the garage doors disappear into a timber wall.

Once inside you appreciate how effortlessly the open plan spaces flow into each other, with the living room, dining room, kitchen and lanai all in close proximity to each other.

The frameless folding doors create an invisible threshold between the inside and the outside and, when completely open, the lanai becomes an extension of the kitchen and family/dining room and vice versa.

The spacious lanai accommodates a braai, bar and seating area making it ideal for entertaining while the swimming pool is integral to the design of the lanai and extends beneath the cantilevered floor slabs. The floating roof rests on a wall of glass while the slightly elevated lanai

FEATURE

www.greenhomemagazine.co.za

G R E E N HOME

9

Frames and watches made with real leaves. Each piece is unique. www.greeneyewear.com • www.greentimepieces.com

FEATURE encourages landscaped terraces to connect the house to the countryside.

The floating timber staircase becomes a grand feature which floats above the floor plane as the natural stone-cladded wall forms the perfect frame for the sculptural masterpiece

by Regardt van der Meulen.

A bridge with glass balustrade connects the two wings of the house while also maintaining a sense of privacy for the main bedroom which is located on the eastern wing of the house.

All the rooms have been organized around the double volume living space which becomes central to the family’s lifestyle.

The two en-suite children’s bedrooms are positioned on the western wing with their own private balconies.

M Square Lifestyle Design ensured that a mood of warmth and comfort filtered through into the interior spaces, and that the finishes remained true to the architecture of the home, thus emphasizing the modern clean lines and natural materials used throughout this house. To achieve this M Square Lifestyle Design set out to incorporate materials like timber and stone, as well as materials such as concrete and glass into the interiors of the home, which facilitates in seamlessly blending it in with the estate’s country environment.

Making use of these materials created a textured and unique interior all the while aiding in the flow of inside and outside spaces.

This visual incorporation of the exterior flowing into the interior, along with the linear design elements, allowed the area to further remain practical and uncluttered.

The scullery, wine cellar and guest toilet are strategically concealed behind shop-fitted components enabling a simple contemporary interior. The kitchen counter doubles up as a server for both the kitchen and the lanai.

The design of the main bedroom incorporates a private lounge and a discreetly screened walk in dressing room.

The tinted glass screen offers privacy for the dressing room thus adding an element of luxury with its high gloss finish.

The suite flows onto a large private balcony with magnificent views of the paddocks and surrounds.

The bed is perfectly positioned in a recessed niche lined with textured wallpaper creating an intimate setting. M Square Lifestyle Design and Nico van der Meulen Architects have flawlessly merged the interior with the exterior, while M Square Lifestyle Necessities’ supply of contemporary furniture, sourced from the finest international brands, completes the home’s luxurious look.

This results in visual continuity between every room and every aspect of the home, which ultimately lends itself to the family being able to interact from every space in the home.

www.greenhomemagazine.co.za

G R E E N HOME

11

FEATURE

KLOOF ROAD HOUSE N

ico van der Meulen Architects ,together with interior designers M Square Lifestyle Design, have recently completed Kloof Road House, in Johannesburg, South Africa. The client’s brief called for a family orientated home suitable for indoor/outdoor entertainment that maximizes the views to the north.

The result is a sculptural piece of architecture that is an extreme transformation from the previously modest single story.

With every room in the house opening outdoors, linking the home with the landscaped garden, indoor/outdoor living is guaranteed.

Werner van der Meulen used morphed steels forms that wrap around and frame the structure by the use of parasitic architecture.

From the street, the boldly designed offshutter boundary wall with black steel shapes creeping over predicts that this is no ordinary piece of architecture.

Steel, glass and concrete are prominently used in Kloof Road House and have been integrated into the design, from the boundary wall all the way to the interior. The angled steel roof of the entrance hall overhangs the double volume window and glass front door at the entrance, while the sculptural steel staircase is visible behind the window.

12

The wall of the entrance is clad with natural timber in a herringbone pattern to soften the harshness of the steel, glass and concrete interior, while the backlit ceilings create a shadowless interior inside the sculptured 3D forms.

M Square Lifestyle Design translated the architectural concept of Kloof Road House into the interior design. Steel perforated panels and off-shutter concrete were amongst the elements used for the interior, while the design of the lighting compliments the bold forms of the home and defines the angles.

Concrete, glass and steel visually link the interior and exterior, smoothly integrating architecture and interior design. The furniture, decor and feature lights that complement this are sourced from M Square Lifestyle Necessities.

Nico van der Meulen Architect’s trademark of seamlessly connecting the indoor and outdoor spaces is achieved through the use of frameless folding glass doors, transforming the lanai into an extension of the living room.

The double volume living room and dining room, kitchen and lanai are situated in an open plan area and coherently merge into one another with a polished concrete floor extending to the lanai. The angled columns supporting steel beams and the roof pierce the double volume

space. These structural elements were designed to appear sculptural, while the sculptures on display compliment the structural components of the building.

Energy efficiency was very important, so a decision was made to use a water-based under floor heating system, connected to solar panels and a heat pump, both for heating and cooling.

This was installed in a polished concrete floor for good conductivity.

Kloof Road House has four en suite bedrooms; two children’s bedrooms and a guest bedroom situated downstairs and the main bedroom suite located upstairs. The design of the main bedroom incorporates a large open balcony with views stretching to the far horizon, while the open plan bathroom flows around the corner to the expansive dressing room. The main suite has its own lounge area with a television and fireplace, as well as a mini kitchenette cum bar.

A pyjama-lounge and playroom is located upstairs and overlooks the double volume living spaces and kitchen, leading onto a large northfacing balcony that forms the roof of the lanai, offering views of the garden and other distant views. A 12 x 8m floating pavilion is located on the lower level of the sloping garden and affords views of the northern facade in its entirety, as

FEATURE well as the cantilevered koi pond and north views towards Sandton. The pavilion allows for effortless entertaining at the swimming pool with an open fire pit next to it, as well as a barbeque and bar located within.

M Square Lifestyle Design is an interior design practice that creates bold and contemporary design solutions, while M Square Lifestyle Necessities is an upmarket furniture and dĂŠcor showroom with a selection of the finest imported furniture from design studios around the world.

Both companies were established in association with Nico van der Meulen Architects.

G R E E N HOME

www.greenhomemagazine.co.za

www.greenhomemagazine.co.za

G R E E N HOME

13

14

NEWS

ECO-MOBILITY: SOUTH AFRICAN-MADE, PLUG-IN HYBRID

F

ollowing the premier of its hybrid technology in the S-Class, Mercedes-Benz has expanded the technology to the C-Class, in the form of the C 350 e sedan.

One of the plants producing the newly launched C-Class sedan is Mercedes-Benz South Africa’s (MBSA’s) facility in East London.

The sedan offers a range of 31km in purely electric mode. Its four-cylinder petrol engine, in conjunction with an electric motor, gives it a total system power output of 205 kW and torque of 600 Nm. Fuel consumption is certified as 2.1 l/100 km.

This corresponds to carbon dioxide emissions of 65 g/km.

The local manufacture of a C-Class with the latest plug-in-hybrid technology for local and export markets is a first for MBSA, says the company.

“The successful manufacture of the C 350 e sedan at our award-winning Mercedes-Benz East London plant to exacting world-class standards, is another milestone in our illustrious 68-year history of engineering excellence,” says MBSA www.greenhomemagazine.co.za

CEO and manufacturing executive director, Arno van der Merwe.

MBSA logistics division project management specialist Liebrecht Otto says all employees and contractors involved with the manufacture of the hybrid units were specially trained to work with high-voltage components.

“The sedan offers a range of 31 km in purely electric mode. Its four-cylinder petrol engine, in conjunction with an electric motor, gives it a total system power output of 205 kW and torque of 600 Nm.” “Instructors from TÜV SÜD, an international service corporation focusing on consulting, testing, certification and training, were brought in to the plant to ensure that we met the highest international safety standards.

“From a facility perspective, to accommodate some of the additional work content, we installed a new lifter and high station in the assembly area.

Additionally, we installed a manipulator on the trim line to aid the operator in securing the new battery into the vehicle,” notes Otto.

The C 350 e’s electrical energy storage unit is a high-voltage lithium-ion battery with a total capacity of 6.2 kWh, which can be charged from an external power source.

The battery is water-cooled, weighs around 100 kg and is mounted in a sheet-steel housing underneath the rear axle, in order to maximise crash safety, driving dynamics and boot space.

Thanks to an intelligent, on-board charging system the battery can be recharged in around 1 hour 45 minutes at a wall-box (230 V, 16 A, 3.7 kW single-phase).

Alternatively, charging via a standard domestic socket is also possible.

Depending on the connection, a charge time of around two hours is possible (with 230 V and 13 A, 3 kW).

In the new Mercedes-Benz C 350 e, the hybrid-drive concept is combined with a fourcylinder petrol engine, with a displacement of just under two litres.

G R E E N HOME

15

16

COVERED POOLS PLAYING AN INTEGRAL PART IN SOUTH AFRICA’S SHIFT TOWARDS SUSTAINABILITY

W

ith South Africa experiencing one of its driest periods in history and many areas under tough water restrictions, pool owners have decided to cover up. Homeowners are realising that a simple pool cover can have a vast effect on domestic water consumption and allows one to stay within the bounds of the municipal restrictions, according to PowerPlastics Pool Covers.

“Pools and gardens can account for 60% of a home's water usage. All pool covers stop over 98% of water evaporation, reducing the need for top ups and offering a remarkably easy way to adhere to water allowances. It’s a small change that does not affect lifestyle but has such a huge impact collectively. An 8x4m or 32m2 pool in local conditions will lose 38,400 litres or 38,4m3 a year. If all pools were covered, this would represent an annual water saving equivalent to a third of the size of Hartbeespoort Dam,” says Carolyn Idas of PowerPlastics Pool Covers.

The alternative? Since the water restrictions were introduced, many homeowners have emptied their pool entirely. This is never ideal as an empty pool quickly deteriorates and is one of the leading causes of depreciation in property value. An empty pool will crack and the shell can rise from the ground without the weight of the water to keep it in place. The cost of restoring a pool after it has been empty for a while is significant and a new pool pump is often required too. Rather preserve your property value in the most effective manner, by covering your pool.

Water saving aside, the argument for pool covers has never been stronger. PowerPlastics Pool Covers has developed the most comprehensive range of pool covers in South Africa, providing solutions for a wide cross section of needs and recognised as the leader in eco-smart pools. Parents concerned about child safety can enjoy peace of mind with the Energy-saving Solid Safety Cover which forms a complete barrier over the pool as well as reducing filtration times by 50%. Or choose from the innovative thermal range to reduce filtration times and raise water temperatures without any electrical heating systems. “ The New EnergyGuard Selective Transmission cover, another ‘smart’ pool cover, has also recently undergone an upgrade which has boosted performance. This new material

www.greenhomemagazine.co.za

effectively screens different light rays. The light in which algae reproduces is prevented from entering the water, while the light rays which raise water temperatures are still absorbed by the water, allowing the cover to naturally heat the pool by up to 7 degrees Celsius. This combined with reduced filtration times creates the added bonus of being able to save electricity as well as water and chemicals with just one cover,” says Idas.

At the top end of the market are the sleek, automated slatted systems. Recently launched, the Solar-powered Slatted Cover is perfect for retrofits. This product, powered by solar energy only, closes the pricing gap between manually

operated thermal or safety covers and high-end fully automatics, bringing more choice to the mid and upper range of the pool cover market.

“In South Africa, we have to become more practical and innovative in how we use and maintain our pools. Pools are no longer just a source of fun and exercise – pools need to be covered with the right cover for the lifestyle, to enhance sustainable living and to creating opportunities for financial savings too,” concludes Idas.

The PowerPlastics Pool Covers range is available throughout South Africa through a network of distributors.

Visit www.powerplastics.co.za to learn more.

G R E E N HOME

17

INNOVATIONS

ECO-BUILDING MATERIALS Armstrong Ceilings – Dune Supreme Tegul Global GreenTag™ GBCSA Level A Certified, range of mineral ceiling tiles with 39.3% pre-consumer recycled and 4.7% post-consumer recycled contents. Suitable for commercial buildings. Armstrong Dune Supreme ceiling tiles are high strength and durable for interior use in a wide range of commercial buildings. This range of products offer a microperforated, finely sanded surface texture and is available in wide range of sizes and durable edge details. Dune Supreme has high resistance to humidity and enhanced acoustical absorption. www.armstrong.com

Agilia self-compacting concrete With its remarkable fluidity, Agilia® compacts without the need for vibration, eliminating this tiresome chore and the associated noise nuisance from construction sites. The new concrete technology used in Agilia® products allows for placing without difficulty, providing excellent quality concretes with superior surface finishes.

Agilia® gives flexibility on worksites at all levels, for all types of applications (foundations, horizontal and vertical structures).

A revolutionary self compacting concrete, Reliable, hassle free and with a superior finish. Agilia is specifically designed to provide maximum performance and quality and durability. It sets the benchmark for the construction industry in South Africa and offers reduced costs, by not having to screed if one is wanting to carpet or tile on a surface. www.lafarge.co.za 18

MK1 These interlocking floor tiles are made from recycled rubber thermoplastic compound, creating a highly durable and industrial quality product.

• Thick (8mm) for hardwearing areas.

• Applications include workshops, garages, storerooms, factories and fitness areas, amongst others.

• No adhesive required.

• Easy to install.

• Chemical- and fire-resistant.

• Non-conductive.

• Ramp edges available (465mm x 30mm x 6mm). www.matting.co.za

HOME

YOUR GUIDE TO

A GREENER HOME

www.greenhomemagazine.co.za

G R E E N HOME

19

Demand for grid energy can be reduced by generating energy on-site through wind turbine and roof-mounted PV cells.

* see IsoBoard

Geyser blanket and geyser pipe insulation keeping hot water hot.

As much as 25% of household electricity is used for lighting, installing LED lighting will dramatically reduce this demand.

Insulate excellen the entir fan can on hot

Roof insulation keeping the house cool on hot days and warm on cold days, diminishing the need for airconditioning and heating. * see IsoBoard

Significant council water and electricity can be saved by installing low-flow shower heads, taps and WC’s.

Council water use can be dramatically reduced through black- and greywater harvesting and recycling by installing greywater systems.

FIT SOLAR?

Heating and air-conditioning are high users of electricity.

Wall insulation can significantly reduce the need for these. * see IsoBoard

Enerlogy

is a renewable energy business focused on solar installations for consumers, commercial businesses and industry.

With the ever increasing electricity price increases, fit solar PV to your roof and benefit from an inexhaustible power supply, the SUN!

y r designed for new builds d industry rs

ertain areas and maybe be rolled policy your electricity bill (no batteries) kup during load shedding

Enerlogy Solar

Intelligent Energy Enerlogy Solar helps consumers and businesses to produce their own electricity from solar so that they can save money and reduce their reliance on the national grid. Enerlogy Solar supplies and

installs solar photovoltaic modules (solar panels), inverters and all related products. Solar energy is 48 Eckstein Street, Observatory, Johannesburg clean, reliable and affordable. Enerlogy supplies only leading brands of products and are accredited 011 648 3710 | 082 727 9940 | installers of Solar Frontier and Fronius. Enerlogy has completed numerous installations for info@enerlogy.co.za | www.enerlogy.co.za residential customers, businesses and schools. www.enerlogy.co.za | info@enerlogy.co.za

20

| 082 727 9940

PowerPlastics Poo manufactures innov affordable pool cove a more sustainable po less water, power and Available through www.powerlastic info@powerplast Tel: 0860 268

ed fireplaces can be an nt source of heating for re house. An extractor have a cooling effect t days by exhausting hot air.

Solar panels produce free, clean, reliable and affordable renewable energy.

South Africa is blessed with excellent sunlight and we should use this resource to produce most of our electricity, thereby saving money and saving the planet. *see Enerlogy

Strategically planted deciduous trees on the northern and western elevations provide shade in summer months and shed leaves to allow warm sunlight in during winter.

Use of the correct roofing material can dramatically reduce need for heating and cooling in the home.

Correctly placed skylights and windows allow for natural lighting.

Ensure window frames seal your home from external elements. * see Fenster

Installing awnings of the correct size will allow sunlight in during winter and block it out in summer as the sun changes position.

ol Covers vative and ers to enable ool that uses d chemicals. hout SA. cs.co.za. tics.co.za 377.

Underfloor Insulation to reduce the need for heating in winter months. * see IsoBoard

www.greenhomemagazine.co.za

Use ecofriendly flooring products to reduce your impact.

Gas is a fossil fuel but appliances use gas very efficiently and, as such, using a gas stove can reduce costs and impacts.

Separation at source is a great way to divert household waste from landfill.

G R E E N HOME

21

nerlogy

able energy business n solar installations umers, commercial sses and industry.

FENSTER

Fenster manufactures handcrafted, custom-made premium

quality European aluminium windows and doors to suit e ever increasing unique needs and cocoon your home & office from exterior ice increases, fit solar elements. To achieve the highest standards, we use the best roof and components benefit fromand accessories available. Our diverse range is in a ustible power supply, class of its own and is ideal for both new builds and upgrades. the SUN!Energy efficient, water, sound and wind proof, our products are designed with a modern contemporary feel, and available in double or single glazing. By using the most durable glass on the market, Fenster is able to offer a very high level of security.

We tailor make all windows and doors to meet individual requirements and each aluminium fixture is hand-crafed to the highest standard. www.fenster.co.za Enerlogy Solar

Intelligent Energy

ENERLOGY ohannesburg (PTY) LTD

Enerlogy Solar helps consumers and businesses to produce their own electricity from solar so that they can save money and reduce their reliance on the national grid. Enerlogy Solar supplies and installs solar photovoltaic modules (solar panels), inverters and all related products. Solar energy is clean, reliable and affordable. Enerlogy supplies only leading brands of products and are accredited installers of Solar Frontier and Fronius. Enerlogy has completed numerous installations for residential customers, businesses and schools.

ogy.co.za Enerlogy Solar helps consumers and businesses to produce www.enerlogy.co.za | info@enerlogy.co.za | 082 9940 they can save money their own electricity from solar so727that and reduce their reliance on the national grid. Enerlogy Solar supplies and installs solar photovoltaic modules (solar panels), inverters and all related products. Solar energy is clean, reliable and affordable. Enerlogy supplies only leading brands of products and are accredited installers of Solar Frontier and Fronius. Enerlogy has completed numerous installations for residential customers, businesses and schools. www.enerlogy.co.za | info@enerlogy.co.za | 082 727 9940

POWERPLASTICS POOL COVERS PowerPlastics Pool Covers manufacture an innovative range of pool cover solutions, taking an insightful approach to product development and promoting a lifestyle choice, not just a pool cover. Our solutions are always innovative, directly addressing issues affecting South African pool owners. Our skilled sales teams understand the market and the common pain points of pool owners, advise on the most appropriate cover solution, supported by a technical team who ensure perfect fitments and installations. Our superior manufacturing and locally unparalleled designs combined with an unfailing customer centric approach are what sets us apart in the industry. www.powerplastics.co.za 22

ISOBOARD

IsoBoard Over rafter thermal insulation This is a wonderfully elegant way of installing thermal insulation. As costs rise, and our homes of necessity become smaller, increasing the volume of your living space creates comfort beyond the excellent temperature control delivered by IsoBoard. Boards are secured horizontally above rafters in lengths up to 8000mm, and in thicknesses from 25mm to 80mm, depending on your insulation requirements.

Available in the “Isopine” finish as shown, or as edge bevelled panels, IsoBoard can be painted to match your home using any water-based paint or wood stain.

IsoBoard Insulated ceiling This very popular method for installing your thermal insulation and ceiling simultaneously is becoming an integral part of how homeowners and developers address their energy efficiency challenges. The ease of installation by both professional and DIY users makes IsoBoard the most cost effective ceiling solution for both new and renovation projects.

The range of IsoBoard lengths and thicknesses mean there is a ceiling solution for almost every requirement. IsoBoard is also ideal in humid areas such as kitchens and bathrooms, being unaffected by moisture and water vapour. IsoBoard can be painted with any water based paint or stain.

IsoBoard Cavity Wall Insulation There are many good reasons for fitting thermal insulation to masonry walls, even though this is not a requirement of the National Building Regulations.

Although the roof is the main source of heat transfer into and out of a home, as homes get smaller, the wall area increases relative to the roof area, and walls become more significant as surfaces for heat exchange to take place. This is particularly true as buildings get taller by adding floors. Isoboard within the wall cavity prevents heat transfer, maintaining a stable room temperature. The effect of good wall insulation is often sufficient to avoid expensive glazing solutions to energy control when designing a comfortable home.

IsoBoard Under-Floor Insulation Insulation is mandatory in new buildings which intend to use under floor heating systems, and installing a 30mm thickness IsoBoard below the floor slab or screed is sufficient to achieve regulatory compliance. The benefit of an IsoBoard insulated floor is that the floor will be warmer by 4 to 7 degrees Celsius whether there is heating or not, and many users find that they only need to use their heating systems if temperatures are very cold for extended periods. Being of high compressive strength, and resistant to the effects of moisture, IsoBoard will perform effectively for as long as the building stands. www.isoboard.co.za

INNOVATION

ECO-BUILDING MATERIALS ECO CEMENT A masterpiece of cement engineering, this green building product is the most environmentallyfriendly cement available and the result of careful research and development by dedicated team. This cement offers guaranteed high-performance and reactive mineral components with excellent properties. It has a low carbon footprint, almost half that of Ordinary Portland Cement and allows for a smooth, defect-free finish for concrete, masonry and plasterwork.

It creates durable concrete and is suitable for aggressive conditions, is perfect for reducing the heat of hydration in mass concrete and improves concrete’s resistance to chemical attack. This eco cement makes concrete highly resistant to alkali-aggregate reaction and is suitable for reducing the permeability of concrete in water retaining structures www.afrisam.co.za

Belgotex Floors – Structured Needlepunch Resin Backed Carpet Global GreenTag® GBCSA Level A Certified, Low VOC Polypropylene yarn Structured Needlepunch Resin Backed Carpet. Suitable for commercial applications. The Structured Needlepunch Commercial Carpet can be shredded intact, baled and re-cycled, e.g. in core bungs. Belgotex Floors is ISO 9001 and ISO 14001 certified, and monitors its energy and water use and its waste flows and carbon emissions, with the aim of continuous improvement. They also generate about 5% of their total annual energy requirement themselves, using onsite solar PV panels. www.belgotex.co.za

Futurehouse Thermapanel System The Futurehouse Thermapanel system is 40mm thick x 1200 x 1000mm High Density expanded polystyrene (EPS) sheets with tongue and grooved edges that are optionally glued together with a water based EPS adhesive – Styroglue, to create a continuous thermal and moisture barrier.

• Thermapanel benefits: • Lightweight and easy to install • Highly effective and low cost method of insulation.

• Can be supplied in thicker sheets if higher levels of thermal insulation are required.

• Sheets can be glued together with Futurehouse Styroglue to improve the effectiveness against water penetration. www.futurehouse.co.za

Echo Wool Nylon Range Echo Wool 90%, 10% Nylon Upholstery fabric is available in a wide range of colours, patterns, weaves, and weights. The fabric is inherently fire resistant meeting the AS 1530.3 standard without the addition of fire retardants. The fabrics also meet the fitness for purpose requirements for colour fastness. The yarn are dyed and woven into fabric in a Enviro-Mark Diamond certified facility, The fabrics are able to be recycled by Woven Image, if uncontaminated by adhesives, toxic substances, finishes, coatings and any other additive or material that compromises the recycling of the textiles. The product is GreenTag GreenRate Level A Certified under Scheme A19. www.wovenimage.com

www.greenhomemagazine.co.za

G R E E N HOME

23

10 facts you need to know about water in South Africa 1. More than 33% of South Africa’s dams are classified as eutrophic i.e. overloaded with nutrients.

2. Only 9% of South Africa’s rainfall ends up as run-off in rivers.

3. On average, South Africa’s water resources are made up of 77% surface water, 14% return flows, 9% groundwater, and less than 1% desalinated water.

4. The agricultural sector uses 63% of South Africa’s water resources, followed by urban domestic use (24%).

5. South Africans use 26% more water on average per day than the rest of the world.

6. Measures to mitigate water shortages in South Africa include desalination, increasing dam capacity, and using borehole water.

7. Already 98% of South Africa’s surface water resources have been allocated for use.

8. Almost 36% of South Africa’s clean drinking water is lost through leaking pipes every year.

9. Less than 200 mm of rain a year is received by 21% of South Africa.

10. On average, 7% of South Africa’s available water is lost to invasive alien plants.

Always be Water Wise.

www.randwater.co.za and click on the Water Wise logo FOR FURTHER INFORMATION ON WATER WISE, PLEASE CONTACT US ON: 0860 10 10 60

24

WATER SAVING

RAINWATER HARVESTING NATURE’S ECONOMICAL ALTERNATIVE

A

s many countries –including our own– continue to face a multi-faceted water crisis, the century’s old practice of rainwater harvesting has gained popularity as an economical alternative, proving immensely successful in the right climates. In addition, as our awareness and desire for environmental feature increases, more and more people are turning to rainwater collection systems as a sustainable way to collect and store water for landscaping as well as other household uses.

Industrial advances in rainwater collection permits captured rain to be used for a range of indoor and outdoor residential needs. Rooftop harvesting and underground reservoirs collect and store precipitation to be utilised for heating your home, use in appliances as well as for bathing, cooking and drinking.

What is rainwater harvesting?

Rainwater harvesting is the capture, diversion, and storage of rainwater for a number of different purposes including landscape irrigation, drinking and domestic use, aquifer recharge, and stormwater abatement. In a residential or small-scale application, rainwater harvesting can be as simple as channelling rain running off an unguttered roof to a planted landscape area via contoured landscape. To prevent erosion on sloped surfaces, a concave holding area down slope can store water for direct use by turfgrass or plants. More complex systems include gutters, pipes, storage tanks or cisterns, filtering, pumps, and water treatment for potable use.

Why should I harvest the rain?

is low or varies during the rainy season in rivers and other surface water resources.

and has a positive impact on health. It can also strengthen a sense of ownership.

Advantage of collection and storage near the place of use Traditional sources are located at some distance from the community. Collecting and storing water close to households improves the accessibility and convenience of water supplies

Quality of water supplies Water supplies can become polluted either through industrial or human wastes or by intrusion of minerals such as arsenic, salt (coastal area) or fluoride. Rainwater is generally of good quality.

The reasons for collecting and using rainwater for domestic use are plentiful and varied: Increasing water needs/demands The increased need for water results in lower groundwater tables and depleted reservoirs.

Many piped water supply systems fail. The use of rainwater is a useful alternative.

Variations in water availability The availability of water from sources such as lakes, rivers and shallow groundwater can fluctuate strongly. Collecting and storing rainwater can provide water for domestic use in periods of water shortage. Rainwater may also provide a solution when the water quality

www.greenhomemagazine.co.za

G R E E N HOME

25

Secure your own water supply from simple household water storage solutions to comprehensive rainwater & greywater harvesting systems 1 4

Rain water can be harvested for indoor & outdoor use, when connected to the irrigation or municiple water supply

We offer custom water solutions for the storing, recycling, filtration and purification of water to ensure cost-saving and environmental sustainability with real impact

2

Back-up municipal water to ensure uninterrupted water supply 3

Water from back-up reserves can be treated and purified through a range of processes for both drinking water or grey water recycling, when optimised for washing machines, showers and toilets.

5

Store recycled rain water/ grey water and municipal back-up water, effectively

and sustainable water management solutions: Filtration, Sterilisation, Purification, Recycling, Heavy-metal removal, Conditioning and many more...

www.aquamat.co.za

WE CARE, DO YOU?

WESTERN CAPE DISTRIBUTION NOW OPEN

Visit our website / online shop for our vast range of water purification products and solutions Email : hello@aquamat.co.za I National Sales : 087 980 0327

WATER SAVING What are the rewards and shortcomings of RWH? When considering the possibility of using rainwater catchment systems for domestic supply, it is important to consider both the advantages and disadvantages and to compare these with other available options.

Advantages

Disadvantages

Simple construction: Construction of RWH systems is simple and local people can easily be trained to build these themselves.

This reduces costs and encourages more participation, ownership and sustainability at community level.

High investment costs: The cost of rainwater catchment systems is almost fully incurred during initial construction. Costs can be reduced by simple construction and the use of local materials.

Good Maintenance: Solely the tank owner’s family controls Operation and maintenance of a household catchment system. As such, this is a good alternative to poor maintenance and monitoring of a centralized piped water supply.

Usage and maintenance: Proper operation and regular maintenance is a very important factor that is often neglected. Regular inspection, cleaning, and occasional repairs are essential for the success of a system.

Relatively good water quality: Rainwater is better than other available or traditional sources (groundwater may be unusable due to fluoride, salinity or arsenic).

Water quality is vulnerable: Air pollution, animal or bird droppings, insects, dirt and organic matter may affect Rainwater quality.

Low environmental impact: Rainwater is a renewable resource and no damage is done to the environment.

Supply is sensitive to droughts: Occurrence of long dry spells and droughts can cause water supply problems.

Convenience at household level: Unpredictable rainfall and limited It provides water at the point of consumption. supply: The supply is limited by the amount of rainfall and the size of the catchment area and storage reservoir.

Not affected by local geology or topography: Rainwater collection always provides an alternative wherever rain falls.

Flexibility and adaptability of systems to suit local circumstances and budgets, including the increased availability of lowcost tanks (e.g. made of Ferro cement, plastics or stone/bricks).

www.greenhomemagazine.co.za

What are the types of Rainwater Harvesting Systems available?

Collection systems can vary from simple types within a household to bigger systems where a large catchment area contributes to an impounding reservoir from which water is either gravitated or pumped to water treatment plants. The categorisation of rainwater harvesting systems depends on factors like the size and nature of the catchment areas and whether the systems are in urban or rural settings.

Some of the systems are: Simple roof-water collection systems The main components in a simple roof water collection system are the cistern itself, the piping that leads to the cistern and the appurtenances within the cistern. The materials and the degree of sophistication of the whole system largely depend on the initial capital investment.

Larger systems for educational institutions, stadiums, airports, and other facilities When the systems are larger, the overall system can become a bit more complicated, for example rainwater collection from the roofs and grounds of institutions, storage in underground reservoirs, treatment and then use for non-potable applications.

Roof-water collection systems for high-rise buildings in urbanised areas In high-rise buildings, roofs can be designed for catchment purposes and the collected roof water can be kept in separate cisterns on the roofs for non-potable uses.

Land surface catchments Compared to rooftop catchment techniques, ground catchment techniques provide more opportunity for collecting water from a larger surface area. As there is a possibility of high rates of water loss due to infiltration into the ground, and because of the often-minimal quality of the water collected, this technique is mainly suitable for storing water for agricultural purposes.

G R E E N HOME

27

PROVIDING INNOVATIVE SOLUTIONS FOR YOUR WATER NEEDS Eco Friendly Water Treatment Sewage & Waste Water Treatment The Clarus Fusion is a factory-built activated sludge sewage treatment plant

Swimming Pool Treatment • • • • •

• • • • • • • •

Urban and rural usage Effluent meets DWA general limit Low power consumption Installed underground Low maintenance Low noise factor Small footprint Manufactured from non-corrosive materials

No red eyes or irritated skin Saves electricity No buying chemicals No pollution!

Save water – use backwash water in the garden Three stage activated sludge system

Re-use 100% of your grey water

Air Purification

• Fully assembled, ready for drop-in on site • Both Grey Water and swimming pool backwash water can enter the tank • No bad odours • WW1 Filter is easy to clean • Overflow goes to municipal sewer • Surface (JET) or Submersible (Citypump) can be used • Rain water harvesting optional • Very low maintenance.

• UV for disinfection is optional

Suffering from sinus or hay fever?

• Air gets filtered, ionised and disinfected • Body resistance gets increased • Relieves or eliminates respiratory allergies • Illnesses can be prevented.

At the office...

• Improves productivity through Ionization of the air • Ionization supports serotonin production in the brain and cleanses the air from odours, pollen and dust mites.

• Reduce sick leave 28

086 12 WATER (92837)

www.maskamwater.com info@maskam.co.za

WATER SAVING What are the components of a Rainwater Harvesting Systems?

Regardless of the complexity of the system, the domestic rainwater harvesting system comprises six basic components: • Catchment surface: the collection surface from which rainfall runs off.

• Gutters and downspouts: channel water from the roof to the tank.

• Leaf screens, first-flush diverters, and roof washers components which remove debris and dust from the captured rainwater before it goes to the tank.

• One or more storage tanks, also called cisterns.

• Delivery system: gravity-fed or pumped to the end use.

• Treatment/purification: for potable systems, filters and other methods to make the water safe to drink.

The Catchment Surface The roof of a building or house is the obvious first choice for catchment. For additional capacity, an open-sided barn –called a rain barn or pole barn –can be built. Water tanks and other rainwater system equipment, such as pumps and filters, as well as vehicles, bicycles, and gardening tools, can be stored under the barn. Water quality from different roof catchments is a function of the type of roof material, climatic conditions, and the surrounding environment.

Gutters and Downspouts Gutters are installed to capture rainwater running off the eaves of a building. Some gutter installers can provide continuous or seamless gutters.

For potable water systems, lead cannot be used as gutter solder, as is sometimes the case in older metal gutters. The slightly acidic quality of rain could dissolve lead and thus contaminate the water supply.

The most common materials for gutters and downspouts are half-round PVC, vinyl, pipe, seamless aluminum, and galvanised steel.

Seamless aluminum gutters are usually installed by professionals, and, therefore, are more expensive than other options.

Leaf Screens To remove debris that gathers on the catchment surface, and ensure high quality water for either potable use or to work well without clogging irrigation emitters, a series of filters are necessary..

Essentially, mesh screens remove debris both before and after the storage tank. The defense

www.greenhomemagazine.co.za

in keeping debris out of a rainwater harvesting system is some type of leaf screen along the gutter or in the downspout.

Depending upon the amount and type of tree litter and dust accumulation, the homeowner may have to experiment to find the method that works best. Leaf screens must be regularly cleaned to be effective.

If not maintained, leaf screens can become clogged and prevent rainwater from flowing into a tank. Built-up debris can also harbor bacteria and the products of leaf decay.

Storage Tanks The storage tank is the most expensive component of the rainwater harvesting system.

The size of storage tank or cistern is dictated by several variables: the rainwater supply (local precipitation), the demand, the projected length of dry spells without rain, the catchment surface area, aesthetics, personal preference, and budget.

Storage tank basics • Storage tanks must be opaque, either upon purchase or painted later, to inhibit algae growth.

• For potable systems, storage tanks must never have been used to store toxic materials.

• Tanks must be covered and vents screened to discourage mosquito breeding.

• Tanks used for potable systems must be accessible for cleaning.

Storage tank siting Tanks should be located as close to supply and demand points as possible to reduce the distance water is conveyed. Storage tanks should be protected from direct sunlight, if possible. To ease the load on the pump, tanks should be placed as high as practicable.

Of course, the tank inlet must be lower than the lowest downspout from the catchment area.

To compensate for friction losses in the trunk line, a difference of a couple of feet is preferable.

When converting from well water, or if using a well backup, siting the tanks near the well house facilitates the use of existing plumbing.

During the past decade, RWH has been actively reintroduced by local organisations as an option for increasing access to water in currently underserved areas (rural or urban). In many areas RWH has now been introduced as part of an integrated water supply, where the town water supply is unreliable, or where local water sources dry up for a part of the year.

But RWH can also be introduced as the sole water source for communities or households.

The technology is flexible and adaptable to a very wide variety of conditions.

It is used in the richest and the poorest societies, as well as in the wettest and the driest regions on our planet.

G R E E N HOME

29

Building the perfect family home or oďŹƒce?

You need the ultimate european quality of Fenster.

30

INSULATION

MIND THE GAP Prevent thermal bridging this winter

W

ith constant pressure on buildings to be sustainable and operate with minimal drag on natural resources, thermal bridging is the evil villain that needs to be repelled.

Thermal bridging reduces energy efficiency in buildings when one or more areas of the building offer significantly higher heat transfer potential compared to the surrounding materials. Also known as a cold bridge or heat bridge, thermal bridging can lead to an overall reduction in thermal insulation in addition to encouraging condensation. This, in turn, can cause problems with the quality of the air indoors. Aside from the effect on personal comfort and the increased costs relating to creating an ideal interior climate control, condensation can also lead to deterioration of the building structure itself.

There are three primary ways in which thermal bridging can occur: • When a material used in the building has a higher thermal conductivity than that of the materials that surround it.

• When the thermal envelope is penetrated in any way.

• Where there are discontinuities or gaps in the insulation material itself.

The key to reducing or eliminating thermal bridging is through careful design as well as by applying the correct building and insulation www.greenhomemagazine.co.za

materials that will create a uniform thermal resistance, for instance through thermal breaks and continuous insulation.

The hallmark of successfully constructed, low-energy buildings is the inclusion of a thermal insulation layer that effectively encloses the entire building, leaving no gaps or areas where heat can escape. A thermal bridge can literally be thought of as a bridge over which heat or cold can pass into or out of a building.

You are most likely to find surface moisture condensation in places where there are connections between the walls and the floor, as well as around windows but, equally, the same places could see mould growth in humid environments.

The only effective means of preventing either

• Metal ties within the cavity between masonry walls.

HOW TO BREAK THE THERMAL BRIDGE If you plan correctly and build according to that plan (using the correct insulating materials) then you can reduce or even eliminate thermal bridging. The following are some key strategies: • T he building enclosure ideally needs a continuous thermal barrier.

• It is essential to reduce (or eliminate entirely) any potential or actual thermal bridges (see Thermal Bridging Hotspots).

• Where it’s not physically possible for direct continuity of the thermal barrier, then it’s essential to introduce lapping of insulation in order to mitigate thermal bridges.

“The biggest thing about a window is not how it insulates, but how well it seals” of these problems is through a multi-dimensional evaluation that would need to take place during the planning and detail stages of the building design. Specific areas to focus on during such an evaluation should include: • Concrete balconies, notably where the floor slab extends through the building envelope.

• Steel or concrete material used in commercial construction, whether they are incorporated in the exterior wall or the roof construction itself.

• Special attention needs to be placed on all window-to-wall interfaces, as these create additional challenges for architects and builders alike.

Not only are energy considerations important in terms of heat transfer, but the elimination of condensation is an important consideration.

Fenestration positioning needs to be carefully considered in terms of the entire environment of the building envelope.

G R E E N HOME

31

www.moonstar.co.za Start Saving Now By Installing

Energy Effic ient

uPVC Windows & Doors Sound Sound Insulation Insulation Weather Weather Resistance Resistance Maintenance Maintenance Free Free All All Sizes Sizes Available Available No No Painting Painting No No Rusting Rusting & & Corrosion Corrosion Easy To Clean Clean Energy Energy Saving Saving

011 312 1622 32

011 024 4608 infojhb@moonstar.co.za

INSULATION CAREFUL PLANNING Simple 1-dimensional or 2-dimensional modelling or following the specs of the insulation material that you specify is no guarantee of creating effective and thorough thermal barriers against thermal bridging. Pay careful consideration to condensation, apply overlapping where possible, and either use 3-dimensional modelling or plain common sense to isolate and identify any potential areas of thermal bridging. Your modelling or R-rating might be spot on, but there remains the potential that the barriers you have planned will not be effective in stopping air flow, which is a major form of heat transfer.

“As a result of improper planning, a cold storage facility had entrances that had been constructed in such a way that they were experiencing massive energy losses as a result of refrigerated air escaping. Once we had selected and installed the correct solution and application they were able to enjoy a 65% drop in energy costs,” said James Mittan of Maxiflex Door Systems.

Your materials and your points of connection (wall-to-floor, wall-to-window, wall-to-ceiling) are key areas to focus on, but a key component that is often overlooked (or whose impact is minimised – especially by homeowners) is the ceiling and the roof or attic space above it. After all, hot air rises – so make sure it can’t slip away or you’ll be flushing money up through the roof!

Innovative products such as IsoBoard’s tongue and groove edge profiles allow adjacent boards to interlock, creating a continuous insulated surface (www.isoboard.co.za).

Fenster Aluminium windows and doors are able to achieve a superior insulating medium by trapping a layer of hydrophobic air between two panes of glass (preventing convection currents from forming). Insulating a glass unit also reduces the emission of radiant solar energy from a warm surface to a cold body or room. Under standard conditions the insulation value of a double glazed unit with low-e is reduced by around 67% in winter and around 64% in summer when compared to ordinary single laminated glass (www.fenster.co.za).

THE RIGHT APPLICATION “The biggest thing about a window is not how it insulates, but how well it seals,” says Panos Tsouroullas, Sales & Marketing Manager for Fenster Aluminium windows and doors. “We also meet and exceed the required U-values because we put the right glass in.”

Fenster use specialised rubber to seal their windows on both sides. “The rubber is sucked into the multi-locking system and this creates really effective weatherproofing that keeps out wind, water and dust. That’s what makes it more energy efficient.”

Panos believes that successful insulation is not just about U–value, but rather the relevance of an application for an installation. He also warns www.greenhomemagazine.co.za

about the dangers of having U-values that are too high, especially during summer when too much heat can create an uncomfortable environment that would necessitate the use of expensive air-conditioning.

“We recommend external blinds or other external barriers because, once the glass is penetrated then the heat it trapped inside.

Having blinds inside doesn’t solve the problem entirely because once the heat has passed through the glass then it’s already inside the room.”

Panos visited cold countries in Europe with the Fenster team to research window options before starting their South African operation. He saw that most houses have small windows and thick walls, which are well-insulated.

“It’s freezing outside, but you’re walking around in shorts and a t-shirt inside because it’s so hot from being well insulated,” said Panos.

“Here we don’t have that extreme weather so we simply have to be energy efficient.”

To make his home more energy efficient Panos changed his windows from single-glaze to double-glaze and also added a slight tint to the glass. “At night I use a simple gas heater with threat bars –and I just have one or two one if it’s very cold –but I haven’t needed underfloor heating and even though I have quite an open house it’s comfortable.

Not a fan of low-e glass (low emissivity glass coatings), he has used it when the correct opportunity presented itself.

“The way the house was built there was a lot of sun on one side and very little sun in certain areas on the other side. Where there was very

little sun I put low-e so that, when the heat comes through from the other side it sort of maintains it in the room with the low-e helping to trap that heat. For that building the low-e was good, but only in a certain section of the house.”

Knowing your R-values According to the Thermal Insulation Products & Systems Association SA, the greater the ‘R-value’, the more effective the insulation at resisting conducted heat flow into the building in summer and out of it in winter. Therefore, the ‘R-value’ is actually a measure of performance. One brand of insulation may be thicker or thinner than another, but if they both show the same ‘R-value’, they will perform equally.

The recommendations for the correct ‘R-value’ are based on the climatic conditions in particular locations. The deemed-to-satisfy provisions are based on climate zones, including dry bulb temperatures, thermal neutrality, humidity and southern coastal condensation risk (see map of climatic zones of South Africa). Please check the map for details of your area. These values are recommended in SANS 10400-XA Energy usage in buildings and SANS 204 Energy efficiency in buildings.

R-values are expressed using the metric unit’s m².K/W, where: • m² refers to one metre squared of the material of a specified thickness; • K refers to a one degree temperature difference (Kelvin or Celsius) across the material; • W refers to the amount of heat flow across the material in watts.

Use the nominal R-values as listed by the manufacturer on the packaging of the insulation to determine the performance.

Products which have the same R-value will provide exactly the same insulating effect as each other, provided they are correctly installed. The higher the R-value, the more effective the insulation. Products must be installed in accordance with the manufacturer’s specifications.

The information available on the product data sheet and/or label must include the R-value and whether it must be installed professionally or DIY. Ensure that it suits your particular application.

Ask if performance guarantees and/or test certificates are available.

Source: www.tipsasa.co.za

G R E E N HOME

33

34

INSULATION

Thermal bridging hotspots If you want to go straight to a building’s weak points to investigate where possible thermal bridging can be happening, look to the following places.

• Where the roof joins the wall.

• Where window edges meet the wall.

• Where the wall connects to balcony slabs.

• Where walls connects to other walls.

• Where sunshade installations connect to the wall.

• Where steel stud construction breaches any external surface.

www.greenhomemagazine.co.za

G R E E N HOME

35

WHY FIT SOLAR? Enerlogy

is a renewable energy business focused on solar installations for consumers, commercial businesses and industry.

With the ever increasing electricity price increases, fit solar PV to your roof and benefit from an inexhaustible power supply, the SUN! • • • • • • •

Reduce your electricity bill substantially Can be retrofitted to existing homes or designed for new builds Suitable for residential, businesses and industry Long operating life span, up to 25 years No Carbon emissions Reduce your carbon footprint Feed-in or net metering may apply in certain areas and maybe be rolled out nationally once NERSA approved policy • Can be installed as grid tied to reduce your electricity bill (no batteries) • Can be installed WITH batteries as backup during load shedding

Enerlogy Solar

Intelligent Energy

Call now for a FREE no obligation quote

Enerlogy Solar helps consumers and businesses to produce th they can save money and reduce their reliance on the nation installs solar photovoltaic modules (solar panels), inverters an 48 Eckstein Street, Observatory, Johannesburg clean, reliable and affordable. Enerlogy supplies only leading 011 648 3710 | 082 727 9940 | installers of Solar Frontier and Fronius. Enerlogy has complet info@enerlogy.co.za | www.enerlogy.co.za residential customers, businesses and schools. www.enerlogy.co.za | info@enerlogy.co.za

| 082 727 99

SOLAR OR GAS?

ENERGY EFFICIENCY

The options are plenty, but opinion remains divided. Should you cut costs and save energy by heating your water with solar or gas?

In an increasingly tough economy, South Africans are constantly looking to save money. As most will tell you, inflation is seldom matched with salary increases, so unless you fall amongst the wealthier citizens, a very close eye needs to be kept on your expenditure.

Most people have already reached the point where they no longer know where to cut costs any further. The cost of living continues to rise and Eskom’s pricing is also set to increase – now reportedly because we’re not using enough of their power so they have to charge us even more for using less.

Solar energy has been around for many years now, and in recent times most building developments have started including solar panels in new developments – especially for more subsistence housing. However, it is not always just as simple as getting it installed: nothing ever really is, unfortunately.

Solar Water Heating Geysers are probably one of the main users of electricity within a household as hot water is something one needs on a daily basis. Solar water heating is one option and, on face value, it sounds like a great way to get your hot water.

If you are building a new home or doing extensive renovations to your current home then it is indeed a great way to go about it. Factored into a 20-year bond it will hardly make a massive difference to your monthly repayments.

www.greenhomemagazine.co.za

However, should you not be renovating or building a new home, then the installation of the solar water heating system might feel like quite a substantial investment.

In addition, because your home was not originally built with the intention of installing a solar water heating system you could come across more issues than you bargained for. It is best to commission a certified installer with experience. Safety is the main issue here and they will know whether your roof can hold the system you choose and how exactly it will work –some systems might also require ongoing maintenance, so ask about this during the purchase process.

The fuel used by solar water heaters to do their thing is sunlight, and as sunlight is a free source of energy your actual energy usage from the grid should drop substantially, which will ensure your costs are reduced accordingly. The initial outlay can be rather pricey, but as a solar heater is a long-term investment you will save a lot of money over the life of the unit.

Unfortunately, solar energy is not a perfect science, which means that a backup heat source might be required. The climate in which you live plays a big part in your choice of system and, once again, this is where your installer will step in to advise you accordingly. As we in South African are blessed with an adequate supply of sunshine hours it means that households which

install solar water heating should be served with free hot water most of the time.

On cloudy days you will likely require a backup source in the event that you have a high consumption of hot water during the course of that day/night. Aside from saving yourself money, you will also be playing your part in helping our struggling environment.

According to sustainable.co.za, the “carbon footprint can be reduced by 2 000kg per year” for every household that decided to go with a solar water heating system.

The website highlights four key components when it comes to the installation of a solar water heating system.

• Solar collectors • A reservoir or storage tank • A heat exchange system • A pump While the initial costs can be slightly offputting, the good news is that costs have dropped dramatically in recent years. This is due to “technological advancements” and an “increasing of awareness of the need to alleviate a dependence on commercial energy sources” (sustainable.co.za).

According to studies, it is estimated that you can pay back the hard costs through your electricity savings “within 4-8 years” of installation.

It is also estimated that your electricity bill can G R E E N HOME

37

38

ENERGY EFFICIENCY decrease by around 40%, although other factors can also play a role in that saving.

A further positive for South Africans is the fact that Eskom offer a rebate for anyone installing a solar geysers in their home, provided they use a registered supplier/installer and that the system they choose is a registered one. This rebate can either be claimed from Eskom by the installer themselves, by the consumer or it can even be deducted from the cost of the system on installation (sunscan.co.za).

Eskom have many registered suppliers around the country and a quick Google search will get you any information you require about products and the costs thereof. However, solar water heating is not the only way one can choose to go. There are other ways of water heating should you not be able to afford the initial outlay for the solar system. Gas is proving to be the most popular alternative.

Gas water heating Some people are gas loyalists while others swear by solar but, at the end of the day, it is down to personal choice and what your household needs are. When considering which option to go for, you must consider many aspects of each side and then do thorough research, including speaking to experts in both fields if possible as both gas and solar have plenty of positives - but each also have their own negatives.

Gas is cheaper than the standard electrical geyser, so your bill will be cut – and many say it will cut it by as much, if not more than solar.

Gas does, however, have a running cost, unlike sunshine, which is free and relatively abundant.

The obvious benefit of gas over solar, however,

www.greenhomemagazine.co.za

is that gas doesn’t require the weather to play along in order for you to be confident of taking a hot shower or being able to wash the dishes. Gas also heats the water up faster and when you need it, which alleviates some of the concerns of solar users.

There is, however, a limit on the amount of hot water solar can provide at any one time, and it does take time to reheat, so especially for larger households capacity can be an issue. This is where your individual research is invaluable. You need to evaluate how much hot water you will need at any one time.

According to The Gas Experts cc, the benefit of having gas is that your water is always warm when you need it: “Solar works fine when the sun is shining, but if you use a lot of hot water at night then there will be no or very little hot water left in the morning, so you will need some sort of backup, like electric or even gas.”

The downside of gas is that it does have a running cost which is linked to the oil price, although the gas price is regulated, confirms The Gas Experts.

South Africa faces an uncertain economic future and electricity costs are at the top of most people’s concern list. If one can afford the initial

outlay then it is most definitely worth moving towards gas or solar, although other options such as heat pumps are definitely worth investigating.

Whether you choose gas or solar you will most definitely cut your electricity bill by a considerable amount while also decreasing your carbon footprint.

In the long run your initial costs will be recouped, with the only barrier being for households that cannot afford the upfront cost.

This is an area where the government needs to step in, especially in terms of assisting poorer communities, who are the very people who suffer the most as a result of electricity price hikes.

G R E E N HOME

39

Privacy has never looked this good

Window Art is the contemporary alternative to blinds and curtains • Peace of mind with a 10-year guarantee • Won't damage your glass - no mess, no fuss • 1 OOs of stunning designs to choose from • Create your own custom design

• Heat and glare reduction, and UV protection • Enjoy an abundance of natural light and great insulation • Branding options for businesses, or privacy for meeting rooms

087 550 3030 www.windowart.co.za gauteng@windowart.co.za • cape@windowart.co.za