Category A timber frame

Fire safety in construction, written by HSE and Published by TSO (The Stationery Office), Third Edition, 2022, defines a category A timber frame as a: ‘A standard system of stud/panel frames and decking which contains no additional fire mitigation features.’

A category B timber frame as: ‘A system of stud/panel frames and decking designed for reduced fire spread, usually pressure-treated with fire retardant. Category B is subdivided into three types, B1, B2 and B3, with increasing protection from fire.’

And a category C timber frame as: ‘A system of stud/panel frames and decking designed to resist fire spread. It offers the greatest protection from fire for a timber-frame building. Category C is subdivided into two types, C1 and C2.’

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