Vent 3 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 use in a fully supported or unsupported tiled, slated or metal roof system. The high vapour permeability and waterproof nature of the membrane, combined with excellent tensile/tear strength and high wind uplift resistance make Vent3 the professional’s choice as the ultimate breather membrane. It is equally suitable whether draped unsupported over rafters or laid directly over insulation.

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https://chandlermaterials.co.uk/blog/post/epdm-flat-roofing-long-term-solutions-to-age-old-problems.html