When installed as directed, this nonwoven waterproofing membrane is manufactured to prevent the ingress of water into foundations, roofs, walls, basements and shower/tub surrounds. It is easy to cut, position and apply. Once installed, it creates a water and vapour-tight barrier to offer superior protection against moisture, mould and mildew. The membrane is designed for the direct application of tile and it is the ideal choice for professionals and DIYers. Specifications: this roll measures 1 metre-wide by 20 metres long, giving you approximately 215 square feet of coverage.