703.5.2 Composite materials.
BC § 703.5.2
Materials having a structural base of noncombustible material as determined in accordance with Section 703.5.1 of this code with a surfacing not more than 0.125 inch (3.18 mm) thick that has a flame spread index not greater than 50 when tested in accordance with ASTM E 84 or UL 723 shall be acceptable as noncombustible materials.













