Last edited 09 Oct 2017

Fire-separating element

The building regulations Approved Document B, ‘Fire safety’ defines a fire-separating element as:

A compartment wall, compartment floor, cavity barrier and construction enclosing a protected escape route and/or a place of special fire hazard.

Part B3 or the building regulations requires that:

  • Buildings are sub-divided by elements of fire resisting construction into fire compartments;
  • Openings in fire-separating elements are suitably protected in order to maintain the integrity of the element (i.e. the continuity of the fire separation); and
  • Any hidden voids in the construction are sealed and sub-divided to inhibit the unseen spread of fire and products of combustion, in order to reduce the risk of structural failure and the spread of fire in so far as they pose a threat to the safety of people in and around the building.

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