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Whilst this publication can still be purchased some of the information in it has been superseded by more recent research and standards. The BRE Group does not accept any responsibility whatsoever for any loss or damage, including - without limitation - indirect or consequential loss or damage arising from use, or loss of use, of data or profits arising out of, or in connection with, the use of this document.
Failure: Extension of fire spread and damage
Defects: No horizontal fire barrier
Barriers are needed to prevent progressive involvement of insulants in fire by restricting hot gases or flames from travelling upwards within the insulation layer, or within any cavity.
For more information see BRE Report 135.