Residential · IRC 2021 §R302.4.2
Membrane Penetrations in Rated Walls
Plan of steel electrical boxes in a rated wall: 16 sq in max each, 100 sq in max per 100 sq ft of wall, 1/8 in annular gap, and 24 in or other separation across the wall.. Referenced to IRC 2021 §R302.4.2.
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