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Housing : June 2009
energy output costs are low, the resulting product ought to cost less. The CSIRO has found that the average building contains about 1000 Gj (Giga = 1000 mega) of energy embodied in its materials used in its construction. Everything we do causes gases to be released which rise into the atmosphere, i.e. emissions. Some of these gases, such as carbon (the chemical basis of all known life on earth), can cause us to live as if under the glass in a greenhouse, hence the name greenhouse gases. So, part of being energy efficient is about not causing further increases in the amount of harmful gases we send into the atmosphere, and in fact trying to reduce them. Energy efficient timber supports this. So, timber, in particular plantation timber – because it is sustainable – minimises the impact of construction on our natural environment because it can require very little energy in its production. Additionally, energy efficient timber in a building allows us to ‘create’ Element Floors Walls Windows (3mm glass) Roofs Table 1: Indicative embodied energy values for common building elements Description Timber suspended with timber sub-floor Timber suspended with brick sub-floor wall Concrete Weatherboard, timber frame Brick veneer, timber frame Double-brick Timber frame Aluminum frame Concrete tile, timber frame Concrete tile, steel frame Metal cladding, timber frame Clay tile, timber frame Source: timber.org.com.au Environmentally friendly housing using timber, p.10. lightweight buildings when the supporting structure – walls (external and internal), floors and roofs – is of timber and is combined with a lightweight, non-structural cladding such as polystyrene (see p.53). Of course, this lightweight structure could also be achieved with other materials such as a concrete floor, steel, or brick veneer etc. depending on the Mj/m2 740 1050 1235 410 1060 1975 880 1595 755 870 1080 1465 NO MORE EXCUSES WHY HIRE WHEN YOU CAN BUY? !WorkCoverApproved ! MultiAwardWinner ! Sets up in under 10 minutes ! Fraction of the cost to existingmethods ! Does not damage roofs !Tin orTile ! Fully Galvanised ! Use your own planks to cut costs ! Does not require scaffold ticket* ! Independently tested by NATA ! Distributed acrossAustralia Australian & International Patents Apply * Subject to state and territory regulations TARGETED www.sssscaffold.com PH 1300 306 069 FAX 03 5241 2568 WILL BE YOU Winner HIA Jim Sweeney Industrial Innovation Award NationalWinnerYellow Pages Business Ideas Grant Gold Medal Geneva Switzerland Highly Commended National Safety Council of Australia Highly CommendedWorksafe Construction Industry ™