The flexible foiled barrier for the brick cavity consists of an intumescent strip faced with high tensile foil, ensuring optimum durability and moisture protection. The powerful intumescent seal, in the event of a fire, expands to create a powerful fire and smoke seal, thus providing effective fire protection. Additionally, a flexible mesh structure offers enhanced robust strength and flexibility to the barrier section.

- WB Cavity Barrier – thin flexible foil-faced intumescent strip. Fixed in a horizontal position in a brick/ block cavity. Fixed with mortar.
- VWB Cavity Barrier – supplied with airflow system, either one, two, or three rows of holes. Depends on the width of the barrier.

– All barriers in the range are designed to fix the gap between the inner and outer course of brick-to-block or block-to-block walls
– The WB foiled cavity barrier range is designed to be fitted horizontally between brick or block walls, expanding to form a complete fire and smoke barrier in a fire
– Foiled cavity barriers are designed to allow insulation material to be installed both above and below the barrier
– VWBG barrier is self-draining – ideal for allowing free airflow in and out of cavities where smoke sealing is required
– The WBS flexible sponge barriers can be fitted horizontally or vertically between brick or block walls, resisting fire and smoke. The ventilated version, which must be fitted horizontally, is also fitted with an intumescent strip which expands to fill ventilation holes in a fire
– Sponge cavity barriers provide their own thermal insulation, but also allow for insulation material to be installed above and below the barrier

- Length: 1/2m
- Width: Various

Application:
BRICK AND BLOCK CAVITIES
The barrier is held into the horizontal position by sandwiching it between the bricks and mortar at the
build stage. For vertical fix use clout nails.

BRICK / WOODEN CAVITIES
The barrier is tucked into the brick mortar during the build stage, It is then held and fixed to the wooden partition by being pushed into position, because the barrier is flexible it has spring tension and will hold itself in position.

CONCRETE TO STEELWORK & STEELWORK TO STEEL FRAME
The cavity barrier can be attached to the concrete/steel using a metal fixing strap FB/c1 1250mm long or FB/c2 2500mm long available from ENVIROGRAF with appropriate fixings The cavity barrier can be formed to the desired profile/shape so that when the cladding is fitted there is sufficient pressure to arch the barrier and form a fire break.

General Fixing Notes
Fix the metal straps with suitable steel fixings or a Hilti gun.
If the cavity barrier needs to be cut foil tape should be applied to the cut area.
Foil tape can be purchased separately by quoting product code ST50