BS 476-3:2004 - Fire tests on building materials and structures. Classification and method of test for external fire exposure to roofs – BSI British Standards

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BS 476-3:2004

Fire tests on building materials and structures. Classification and method of test for external fire exposure to roofs

Status : Confirmed, Current   Published : June 2004

Format
PDF

Format
HARDCOPY



The tests described in this part of BS 476 are designed to give information about fires spreading to the roof of a building from a nearby fire outside the building itself.

The tests are not concerned with the behaviour of a roof when subjected to the effects of fire on its underside. A preliminary test is made in which a specimen section of the roof is subjected to the effects of flame in the absence of radiation.

Unless the specimen is so affected by this test that it is obvious it would not pass the principal tests, i.e. the penetration and the spread of flame tests, these are then carried out using the radiated heat apparatus.

BS 476-3:2004 describes the three stage test method incorporating burning brands, wind and supplementary radiant heat.

The tests are designed to enable measurement of:

  • capacity of a representative section of a roof to resist penetration by fire when the external surface is exposed to radiation and flame
  • 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BS 476-3:2004 supersedes BS 476-3:1975 which is withdrawn.




Standard NumberBS 476-3:2004
TitleFire tests on building materials and structures. Classification and method of test for external fire exposure to roofs
StatusConfirmed, Current
Publication Date14 June 2004
Confirm Date01 May 2015
Cross ReferencesBS EN 13238, BS EN 13501-1
ReplacesBS 476-3:1975
Amended ByAMD 16169
AMD 16924, April 2007.
Draft Superseded By03/109613 DC06/30152150 DC
DescriptorsFire tests, Roofs, Roof coverings, Roof decking, Construction systems parts, Rooflights, Dome lights, Fire resistance, Test equipment
ICS13.220.50
CommitteeFSH/22/-/8
ISBN0 580 43794 9
PublisherBSI
FormatA4
DeliveryYes
Pages16
File Size592.8 KB
Price£126.00


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