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Moisture and Smoke Ventilated Cavity Barrier

Product 55


Mositure resistant cavity barrier specially designed to stop smoke through cavity and provide ventilation.

Not available to purchase online.

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

£0.00 ex. Vat


Moisture Ventilated Cavity Barrier

Moisture Ventilated Cavity Barrier WB or RS/WB/W gives a complete smoke seal.

Additionally, the moisture and smoke Cavity Barrier can have a self-draining and airflow system ( VWBG ). Tubes fix into the barrier unit and set into the mortar, allowing moisture to drain to the external area. Also allows free airflow into the cavity area.

  • Place a tube and rubber grommets through the course between the brick and block mortar.
  • Also, use with an aluminium rainscreen by drilling a hole in the aluminium to allow the tube to go through. Drilled hole size approx 10mm.
  • Tested to BS EN 1363-1 1999 up to 132 minutes.

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.


Order References / Sizes

Moisture and Smoke Cavity Barrier

Gap width 1m long 2m long
VWB75/G                         75mm
VWB120/G                      120mm
VWB150/G                       150mm
VWB200/G                      200mm
VWB250/G                      250mm