A2 Breather membranes have been used abroad in construction since the 1970’s. Membranes were first Certified by the BBA in 1982 as sheathing membrane for timber frame walls and as roof tile underlays in conventionally ventilated cold roofs. They were subsequently approved as roof tile underlays in warm roof constructions in 1982 and most recently in cold non ventilated roof constructions in 1999. At the time of writing this article, Certificates for roof tile underlays used as part of a cold unventilated pitched roof system in dwellings have been issued .

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