Limited Combustible 2
Limited Combustible 2 : As applied to a material of construction, any material that does not meet the definition of noncombustible, as stated elsewhere in this section, and that, in the form in which it is used, has a potential heat value not exceeding 3,500 Btu/lb (8141 kJ/kg) when tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, and also meets one of the following subparagraphs (a) or (b). (a) Materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of 1/8 in. (3. 2 mm) that has a flame spread rating not greater than 50, when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials. (b) Materials, in the form and thickness used and not described by (a) above, having neither a flame spread rating greater than 25 nor evidence of continued progressive combustion and having such composition that surfaces that would be exposed by cutting through the material in any plane have neither a flame spread rating greater than 25 nor evidence of continued progressive combustion, when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials. (NFPA 220, Standard on Types of Building Construction, Chapter 2
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