Insulation
Cavity wall vs solid wall — which does my home have, and how to tell
Most pre-1919 UK homes are solid wall; most 1919–1980s homes are cavity. The simple visual test is the brick pattern: cavity walls show stretcher bond only (rectangular faces); solid walls show Flemish or English bond with alternating short faces. Wall thickness at a window reveal also gives it away — solid walls are typically 220 mm; cavity walls are 250–300 mm.
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