“While our houses need to be ventilated to keep the air fresh and dry, relying on draughts causes discomfort and makes it hard and expensive to heat on cold, windy days.” energywise.govt.nz

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It is senseless to heat air only to allow it to leaving building through gaps in the building envelope. A continuous, sealed air barrier is the solution – but it must be in the right place to avoid condensation forming. In contrast to the rest of the world, New Zealand is putting air barriers outside the insulation – risking internal moisture problems in future.