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Cavity wall

NCC
for the purposes of FV1.1 in Volume One and V2.2.1 in Volume Two, means a wall that incorporates a drained cavity.
HB50
wall system constructed of two separate masonry leaves (skins or wythes) of single thickness separated by a continuous vertical cavity of at least 25-mm but not more than 110-mm width (usually 50-mm), to provide an air space for thermal insulation and a positive water barrier
See Figure A.8; Figure A.9
The leaves of a cavity wall are connected by metal wall ties to provide substantially equal lateral deflection under load.

Figure A.8: Brick and brick veneer construction

Figure A.9: Brick walls