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As we head for a sub-tropical climate, how do we design heat out of our homes?

For anyone who has been around house building since the 1980s, the introduction of Approved Document O: Overheating will seem rather ironic.

Up until the 1980s we built houses rather like today. Brick and block cavity construction, but the cavity was at best 50mm wide and intended to stop damp ingress.

In fact, many a Building Control Officer, or Building Inspector as they were then known, had an argument with a bricklayer about keeping the cavity clear. The idea of a full fill cavity would have been anathema to a good brickie.

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