Last edited 13 Apr 2018

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 insofar as they pose a threat to the safety of people in and around the building.

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