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(a) In buildings of fire-resistive or noncombustible construction, all wood flooring and subflooring shall be applied directly to a floor construction of noncombustible material or may be attached to sleepers of combustible material. In buildings exceeding 100 feet in height, the space between the floor construction and the finished flooring shall be solidly filled with noncombustible materials.
(b) Combustible composition flooring not exceeding one-half inch in thickness may be applied directly to the noncombustible floor construction or to subflooring.
(c) When the subflooring and the structural elements are of fire-retardant treated wood, the space between the floor construction and the subflooring need not be filled.
(Prior code § 62-10.3)