Tyvek® Supro Breather membranes are extremely durable, flexible membranes intended as a roofing underlay in pitched roof constructions. They have the ability to be used in all tiled or slated roofs whether they are refurbished or new build projects. This membrane actively resists wind, snow and dust from entering roofing construction by creating an air tight seal. W1 water resistant before and after ageing: protects from the elements Windtight: Tyvek Supro underlay with a taped lap will satisfy all geographical locations, all site conditions and all building characteristics acc. to BS 5534 wind uplift resistance calculations Vapour-permeable: Protects from water and moisture damage Provides air and moisture management for commercial and domestic buildings For all supported and un-supported pitched roof applications For Scottish sarking board systems For low pitched metal roofs, wall and floor applications BBA certificate 90/2548 EPD available for download here: https://www.dupont.co.uk/content/dam/dupont/amer/us/en/performance-building-solutions/public/documents/en/EPD-Tyvek-2507B.pdf 15-year limited warranty