Breathable Roof Membrane / Breathable Roofing Felt The breathable roof membrane allows roofs to breathe, negating the requirement for traditional ventilation. It is suitable to use this type of breathable membrane as a fully-supported or unsupported underlay beneath tiled or slated pitched roofs, in warm or cold non-ventilated and ventilated roofs. Specification Length: 50m Width: 1m Area per roll: 50m2 Grade: 100 g/m2 Roll Weight: 8kg Colour: Light Grey/Dark Grey Vapour permeability: 3000 g/m²/24h Sd value: ca. 0.02 m Water-tightness: W1 Certification: This product is fully CPR Compliant and CE Approved to EN 13859 ­ 1 for Pitched Roofs. Product is tested to EN 13859-1 and is CE certified. LABC Certified What are the key qualities of breathable roof membrane? Our breathable roof membrane option offers a variety of qualities including: Breathable membranes are a fundamental element of most new build and refurbishment projects. Their adaptable, multi-purpose use is seen by specifiers, merchants and installers as the optimum solution to under-slating requirements. Breather membranes play a key role in protecting buildings and occupants from the elements. In addition to improving energy efficiency, this breather membrane offers long-lasting protection against several threats to building integrity, including condensation and infiltration by water and air. Our General Duty 100 g/sm breathable roof membrane is of equivalent quality but offers a much more cost effective alternative to branded membranes like Cromar and Tyvek.