外部屋顶材料需要具备防火阻燃性，阻止火势的快速蔓延。外部屋顶材料防火性能根据英标BS476-3进行测试及等级评估。中国防火网携手英国UKAS资质EXOVA Warringtonfire实验室提供BS 476 Part 3测试报告及等级评估。咨询电话：025-86583475。

BS 476-3: Fire test on building materials and structures-Part 3: Classification and method of test for External fire exposure roof test.
BS 476-3: 建筑材料和构件的防火测试-第3部分: 外部屋顶着火测试方法及分类

屋顶防火测试等级分类：Classification for External fire exposure roof test
屋顶系统分类EXT.F或者EXT.S。
水平屋顶系统（Flat (horizontal) roof system）为EXT，倾斜屋顶系统（inclined roof system）为EXT.S。
Classification for External fire exposure roof test
Roof systems shall be designated by the letters EXT.F or EXT.S to indicate whether the test results apply to a flat (horizontal) or an inclined roof system, respectively.

Roof systems subject to conditions of external fire shall be classified according to both the time of penetration and the distance of spread of flame along their external surface.
Each category designation shall consist of two letters, eg. AA, AC, BB, these being determined ad specified in 1 and 2

BS476-3建筑材料防火测试相关标准
BS476-4不燃性测试 http://www.firete.com/test_method/558.html
BS476-6火焰传播指数测试 http://www.firete.com/test_method/560.html
BS476-7防火等级测试 http://www.firete.com/test_method/561.html

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