Fire Resistance

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Fire Resistance

(1) The ability of a building component to resist the spread of fire. (2) Fire Resistance – The ability of a roof top material to act as a barrier to the spread of fire and confine it to the area of origin. There are established test procedures for external fire exposure to classify roof systems into Class A, B, or C ratings. Underwriters Laboratories test method 790 established this procedure which ASTM adopted and named ASTM-E 108. Therefore UL 790 and ASTM-E 108 are the same test with different names. Factory Mutual and Warnock Hersey both use ASTM-E 108 as the primary test for fire resistance.