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717.3.1 Draft Stopping Materials
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In noncombustible construction, draft stopping shall be of noncombustible materials. In combustible construction, draft stopping materials shall not be less than 0.5-inch (12.7 mm) gypsum board, 0.375-inch (9.5 mm) wood structural panel, 0.375-inch (9.5 mm) particleboard or other approved materials adequately supported. The integrity of draft stops shall be maintained.
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In occupancies other than Group R, draft stopping shall be installed so that horizontal floor areas do not exceed 3,000 square feet (279 m 2 ...
NYC Building Code 2008 > 7 Fire-Resistance-Rated Construction > 717 Concealed Spaces > 717.3 Draft Stopping in Floors > 717.3.3 Other Groups