Last edited 26 Oct 2020

Elements of structure in buildings

Approved document B, Fire Safety, Volume 2, Buildings other than dwellinghouses (2019 edition), suggests an ‘element of structure’ is any of the following:

The guidance to requirement B3, paragraph 6.2, lists structures that are not considered to be elements of structure:

  • A structure that supports only a roof, unless either of the following applies.
  1. The roof performs the function of a floor, such as for parking vehicles, or as a means of escape.
  2. The structure is essential for the stability of an external wall that needs to be fire resisting (e.g. to achieve compartmentation or for the purposes of preventing fire spread between buildings).

NOTE: In some cases, structural members within a roof may be essential for the structural stability system of the building. In these cases, the structural members in the roof do not just support a roof and must demonstrate the relevant fire resistance for the building as required by the note to paragraph 6.1 (If one element of structure supports or stabilises another, as a minimum the supporting element should have the same fire resistance as the other element).

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