There are six types of cavity wall barrier: -
Non-ventilated wall barrier (WB) is made from impregnated cloth and galvanised wire mesh and is ideal for fixing to cavity walls before fixing door/ window frames.
Ventilated wall barrier (VWB) is made from intumescent material adhered to impregnated cloth with reinforced kraft paper and galvanised wire mesh inside.
In response to requests for a non- ventilated wall barrier like WB but with a facility to let moisture out and keep smoke out of the cavity, this can be achieved with the VWBG barrier consisting of the standard WB barrier but with rubber grommets and plastic tubes coming out of the seal, through
the brick/block joints to the outside.
Non-ventilated wall barrier sponge (WBS). Compress the fireproof sponge into cavity. Can be adhered with intumescent adhesive (IA).
Ventilated wall barrier sponge (VWBS). Compress the fireproof sponge into cavity. It can have the following vent patterns: pattern A has one row of small vents, pattern B has two rows of small vents, and pattern F has one row of large vents. Can be adhered with intumescent adhesive (IA).
Non-ventilated waterproof Thermal Cavity Barrier (TCB) offers both fire protection and effective thermal protection around window and door apertures.