2603.5.7 Ignition.
BC § 2603.5.7
Exterior walls shall not exhibit sustained flaming where tested in accordance with NFPA 268. Where a material is intended to be installed in more than one thickness, tests of the minimum and maximum thickness intended for use shall be performed. Exception: Assemblies protected on the outside with one of the following: 1. A thermal barrier complying with Section 2603.5.2.
2.A minimum 1-inch (25 mm) thickness of concrete or masonry.
3.Glass-fiber-reinforced concrete panels of a minimum thickness of 3/8-inch (9.5 mm).
4.Metal-faced panels having minimum 0.019-inch-thick (0.48 mm) aluminum or 0.016-inch thick (0.41 mm) corrosion-resistant steel outer facings.
5.A minimum 7/8-inch (22.2 mm) thickness of stucco complying with Section 2510.
6.A minimum 1/4-inch (6.4 mm) thickness of fiber-cement lap, panel or shingle siding complying with Sections 1405.16 and 1405.16.1 or 1405.16.2.
