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Technical Guidance Document
Describes a test method to evaluate the fire resistance performance of the open-state cavity barrier against fire exposure from below, measuring the time from ignition necessary to effectively seal the cavity and to maintain the seal. Upward fire spread is of particular concern for rain-screen cladding systems.
Superseded by: TGD 19 Fire resistance test for 'open-state' cavity barriers used in the external envelope or fabric of buildings (ASFP, 2017).
Formed in 1975, the Association for Specialist Fire Protection currently represents the major U.K. based specialist manufacturers and installers of structural passive fire protection systems. They produce technical information to ensure built in fire protection in buildings.
NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.
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