The importance of correct fire protection in cavities between cladding

// fire, security and safety

Standards and approvals

According to Document B of the UK Building Regulations fire barriers must be installed in cavity areas that are vulnerable to the spread of fire. Using the correct passive fire cavity protection system within a building is crucial, in the event of a fire, intumescent fire barriers activate and seal holes, penetrations and cavities, preventing the spread of fire and smoke, thereby fulfilling UK regulations.

However, other regulations may also have to be satisfied concerning cavity barrier specifications. For example, Document C may require the cavity area to allow a free flow of air reducing condensation whilst also offering fire protection. Documents L1B and L2B may require certain cavity areas to offer thermal and fire protection simultaneously. Envirograf have now designed a series of flexible fire protection cavity barriers that fully satisfies all of these cavity protection requirements.


Building Regulations

Section 6 of Document B of the Building Regulations states: 6.1  Concealed spaces or cavities in the construction of a building provide a ready route for smoke and flame spread e.g. in walls, floors, ceilings and roofs. As any spread is concealed, it presents a greater danger than would a more obvious weakness in the fabric of the building.

Standards and Regulations also stipulate that two storey buildings and above require cavity barriers to stop fire from spreading through walls, floors and cavities.

The Envirograf® Cavity Barrier range fully satisfies the requirements stated in Document B of the Building Regulations.

The Envirograf Cavity Barrier range has been tested according to the principles of BS EN1363-1 1999 achieving up to 132 minutes.

www.envirograf.com

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