The tests given in this British Standard are designed to enable measurement of:
a) capacity of a representative section of a roof to resist penetration by fire when the external surface is exposed to radiation and flame; and
b) distance of the spread of flame on the outer surface of the roof covering under certain conditions.
Roofs are graded according to the angle at which they are tested, the time for which they resist penetration by fire, and the distance of superficial spread of flame on their external surface.
BS 476-3:2004 Referenced Document
BS EN 13238 Reaction to fire tests for building products - Conditioning procedures and general rules for selection of substrates*， 2010-02-28 Update
BS EN 13501-1 Fire classification of construction products and building elements. Classification using data from reaction to fire tests
BS 476-3:2004 history
0000 BS 476-3:2004(2007)
2004BS 476-3:2004 Fire tests on building materials and structures — Part 3: Classification and method of test for external fire exposure to roofs