Explore our Cromar Building Products range here at Build & Plumb, where you can find products including the best-selling Cromar breathable membrane roofing underlay. Cromar Building Products is renowned for the quality and value of its extensive roofing range, and Cromar breathable membrane is no exception. Its innovative roofing felt is suitable for cold and warm roofs, whether ventilated or unventilated. Cromar breathable membrane is also BBA certified, promising excellent durability and long-lasting quality. Discover our full roofing range here at Build & Plumb to find everything you need.