Britmet Tileform Ltd, Spital Farm Offices, Thorpe Mead Industrial Estate, Banbury, Oxon, 0X16 4RZ

VENT 3 - BREATHABLE MEMBRANE Vent3 is a triple layer fabric, high performance breather membrane made from high tensile spun bonded polypropylene layers, around a micro-porous polypropylene film. Designed for used in a fully supported or unsupported tiled, slated or metal roof system. Superior moisture vapour permeability is achieved whilst maintaining the highest levels of water resistance. Vent3 has a printed dark blue upper surface and white under-face. The higher vapour permeability and waterproof nature of the membrane, combined with excellent tensile/tear strength, make Vent3 an ideal product...

Vent3 must be installed in accordance with the relevant sections of BS 5534:2003 and Britmet Tileform's fixing instructions Vent3 when installed as a fully supported system, is laid over the support and secured with the counter battens, alternatively the membrane can be installed over counter batens and fixed at 200mm centres using corrosion resistance straps or galvanised clout nails. Tiling battens are fixed to the counter battens leaving a minimum airspace of 25mm between the roof undelay and the tiles for Abutment flashing should be wedged into a mortar joint 25mm deep and at least 150mm...