Question

Why do air air filled cavity walls keep a house warmer in winter than solid brick walls?

Answer 1

Explanation:

So a wall cavity with no insulation warms up because heat conducts through the drywall into the cavity. The air heats up, and convectively moves up and finds a hole to move out of physically, or then conducts through sheathing and siding. Filling the cavity stops most, if not all of the convection...

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