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In architecture, a double wall consisting of two wythes (vertical layers) of masonry separated by an air space and joined together by metal ties. The cavity allows moisture that penetrates the exterior wythe to drain. Cavity walling is used as both non-load-bearing infill for framed buildings and for bearing-wall construction.
This entry comes from Encyclopædia Britannica Concise. For the full entry on cavity wall, visit Britannica.com.