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718.2.7 Concealed Sleeper Spaces
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Where wood sleepers are used for laying wood flooring on masonry or concrete fire-resistance-rated floors, the space between the floor slab and the underside of the wood flooring shall be filled with an approved material to resist the free passage of flame and products of combustion or fireblocked in such a manner that open spaces under the flooring shall not exceed 100 square feet (9.3 m2) in area and such space shall be filled solidly under permanent partitions so that communication under the flooring between adjoining rooms shall not occur.
Exceptions:
- Fireblocking is not required for slab-on-grade floors in gymnasiums.
- Fireblocking is required only at the juncture of each alternate lane and at the ends of each lane in a bowling facility.
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