The 20 x Cromar Vent 3 Classic Breathable Membrane - 1m x 50m by Cromar is an outstanding secondary layer protection for your roof. This breathable membrane is fitted behind the first layer of defence, preventing any water that passes through from entering your roofing space, instead being redirected into the gutter.
Cromar crafted this product for application in a fully supported or unsupported tiled, slated, or metal roof system. This product stands out from the rest because of its high vapour permeability and waterproofing resistance of the membrane, combined with superior tensile and tear strength and wind resistance.
How Does Vent 3 Resist Water While Allowing Water Vapour to Pass Through?
The outer layer functions as a highly effective waterproof barrier, preventing water penetration. The middle layer, made from a high-quality breathable membrane, allows water vapour to escape from the roof space, ensuring proper ventilation. The inner layer protects the membrane from abrasion and damage, strengthening its overall integrity.
Application Notes
Install this product according to BS 5534:2018 and Cromar's fixing instructions. Use the Vent 3 Classic Breathable Membrane as a secondary barrier. Against wind-driven rain and snow, rather than a primary layer.
While it withstands UV exposure for up to three months, best practice recommends completing the first layer installation as soon as possible to ensure optimal protection.
