The Vent 3 Classic Breathable Membrane 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 this product resist water but allow water vapour through?
The outer layer of this product is crafted as a fully functional and exceptional waterproofer, whilst the middle layer is a high-quality, breathable waterproof membrane, allowing water vapour inside the roof space to escape. The final inside layer protects the membrane from abrasion and damage and enhances the overall integrity of the membrane.
Application Notes
This product should be fitted in accordance with BS 5534:2018 and Cromar's fixing instructions. The Vent 3 Classic Breathable Membrane should not be treated as a primary layer. Instead, it's the secondary barrier to wind-driven snow and rain. Although it's resistant to UV exposure, this is only for three months, and therefore, good practice suggests that installation of the first layer should be completed as soon as possible.
