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R-values and cavities

By Eddie Bruce 1 August 2004, Build 83

Cavities may solve weathertightness problems, but they aren’t that straightforward when it comes to working out R-values for insulation. In fact the situation is very complex, but until research provides more accurate answers, a 50% drop in insulation value for any insulation on the outward side of the cavity should be allowed for.

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Cladding life cycle calculator

By Ian Page 1 October 2009, Build 114, Feature article

The BRANZ website has an updated tool to compare the life cycle costs of various common wall claddings. Environmental impacts can be combined with the cost data to arrive at an overall score for different claddings.

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