CAVITY WALL BARRIER AND VENTILATED CAVITY WALL BARRIER
DESCRIPTION
A lightweight and easy-to-use cavity wall barrier available in non-ventilated and ventilated versions and in various widths, for use in cavities in block or brick walls or between brick walls and timber-framed buildings. It can be fixed across the cavity or it can be self-supporting.
USE
There are five types of Envirograf® 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 (see illustrations 5 & 6 opposite). It can be pressed into a V-shape to be self-supporting in the cavity (see illustration 12 opposite). The WB range of barriers can be fitted with a sponge as a cold bridge.
● Ventilated wall barrier (VWB) is made from intumescent material adhered to impregnated cloth with reinforced kraft paper and galvanised wire mesh inside. It can have any of the ventilation hole patterns shown below. Pattern A has a single row of 10mm diameter holes 50mm apart, pattern B has two rows of 10mm diameter holes 50mm apart, and pattern F has one row of 22mm diameter holes 50mm apart. Three slotted hole patterns are available (C/D/E) with two, three, or four rows of slots as shown below.
● 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 ahieved 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 (see illustration 10 opposite). All the above barriers can be made to any width and 950mm or 1900mm standard lengths.
● Non-ventilated wall barrier sponge (WBS). Compress the fireproof sponge into cavity. Can be adhered with Envirograf® Product 46 intumescent adhesive (IA).
● Ventilated wall barrier sponge (VWBS). Compress the fireproof sponge into cavity. It can have ventilation hole patterns A/B/F illustrated below. Pattern A has a single row of 10mm diameter holes 50mm apart, pattern B has two rows of 10mm diameter holes 50mm apart, and pattern F has one row of 22mm diameter holes 50mm apart. Can be adhered with Envirograf® Product 46 intumescent adhesive (IA).
PERFORMANCE
Tested to BS476 Part 22 (1987), achieving up to 104 minutes integrity and 100 minutes insulation.
Also tested to BS476 Part 22 (1987) achieving 132 minutes. Tested to BE EN1363-1.
ORDERING REFERENCES :
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