BS 476-3 Fire tests on building materials and structures — Part 3: Classification and method of test for external fire exposure to roofs

1 Scope

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.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the reference cited applies. For undated references, the latest edition of the referenced
document (including any amendments).

BS EN 13238, Reaction to fire tests for building products — Conditioning procedures and general rules for selection of substrates.
BS EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using test data from reaction to fire tests.