September 8Sep 8 Just about to start insulating a timber frame one storey rear extension. It'll get about 180mm PIR in walls and ceiling and 75mm in floor. So that's nice and warm. But, - the existing house - from the nineties has a cavity wall with 140mm AAC on the inside (meeting building regs back then - and kind of ok) but brick on the outside. The cavity is not insulated, and during the work on the extension work it was clear there's a strong breeze going through that cavity. So come winter I assume that will be as warm as a single skin brick wall 🥶 - and do anything it can to cool down the extension. Any ideas on how to insulate that outside - but now inside - brick wall - or how to close the cavity behind it to stop the breeze ? Thank you so much
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