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CV Strip Cavity Barrier

Product 55


[ CV Strip ]

Cavity barriers designed for timber frame buildings and party walls or floors

Not available to purchase online.

We need to ask you a few more questions and ensure this is the suitable product for your needs.

To order please call us on +44 (0) 1 304 842 555



Flexible Cavity Barrier for Timber

The flexible cavity barrier for timber is a PVC and foil-clad intumescent strip with self-adhesive backing to adhere to walls. Designed especially for timber frame buildings. High expansion intumescent locks against the external side of the internal wall in a fire without affecting the outer wall. Blue plastic sleeve robust enough to prevent damage by water or pests. Under heat the intumescent creates a fire seal, thus providing full fire protection. Cut the seals to any length using the joint sleeve supplied for sealing off the ends.

Specify the overall cavity size and required ventilation gap when ordering.

Cavity Barriers are pieces of fire-stopping material. They fit within the cavity of a building at each floor horizontally and party wall in a verticle position. The material provides compartmentation. Both the flames and heat cannot be transferred to other compartmental areas. Throughout the life of the building, the Cavity Barrier will remain fixed in place. In the event of a fire, the intumescent material expands and seals off the gaps. Additionally, the horizontal barriers allow for a ventilation gap within the cavity. Subsequently closing when the intumescent expands.

Our Cavity Barrier range at Envirograf® offers superb protection to your building by providing fire stopping. Explore the Cavity Barrier range online.


– Both barrier ranges will provide a minimum of 2 hours protection
– CV strip barriers are ideal for modular buildings where space is limited, due to their small profile
– Initially install with adhesive strip to hold in place, then fix more securely with non-combustible fixings
– CV Strip barrier tested to BS476 parts 20, 22 and BS EN 1363-1 (1999), giving fire protection from 60 to 120 minutes.

Case Studies

  • Back to Basics at the School Yard

    Flexible strip cavity barrier used to provide cavity seal.

  • New Timber Frame Development in St. Albans

    Cavity Barrier protecting new development of timber frame studios.

Order References / Sizes

CV Cavity Barrier Strip

Ref                   Width         Thickness           Gap size protection
CV30/4           30mm            4mm                    30/45mm
CV30/6           30mm            6mm                    50/60mm
CV30/8 v         30mm            8mm                    60/70mm
CV30/10 v      30mm          10mm                   80/90mm
CV30/12 v      30mm          12mm                  95/105mm
CV30/15 v      30mm          15mm               100/120mm
CV75/4           30mm            4mm                   30/50mm
CV75/10 v      75mm          10mm                 80/100mm

Available in 1 metre and 2 metre lengths.

V – with Brackets