Cavity Wall Insulation (CWI) was debated at some length last week (Feb 2015).
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It is not true that only “unsuitable” walls can suffer from damp cavity insulation. As a former bricklayer, I know that no wall has ever been built well enough to withstand wind-driven rain. That is the whole point of the cavity – to stop rainwater crossing to the inside. Moreover, even in sheltered areas, retrofit CWI is likely to cause problems, because its installation is contrary to the basic scientific principles governing thermal insulation.
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