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Floor sleepers, bucks and nailing blocks shall not be constructed of combustible materials, unless the space between the fire-resistance-rated floor construction and the flooring is either solidly filled with approved noncombustible materials or fireblocked in accordance with Section 717, and provided that such open spaces shall not extend under or through permanent partitions or walls.

Related Code Sections

804.4.1 Interior Finishes, Sub-Floor Construction
Floor sleepers, bucks and nailing blocks shall not be constructed of combustible materials, unless the space between the fire-resistance-rated floor ...
1805.2 Soils and Foundations, Dampproofing Required
course required by Section 1805.4.1 or the sub-floor. Subgrade for the dampproofing material shall be prepared in accordance with manufacturer's ...
1807.2 Soils and Foundations, Dampproofing Required
) the base course required by Section 1807.4.1 or the sub-floor. Subgrade for the dampproofing material shall be prepared in accordance with manufacturer's ...