TW Metal and Tile Underlayment is a flexible, fiberGlass reinforced, self-adhering rubberized Asphalt sheet membrane, well suited for use as an Underlayment where prevention of water penetration is required prior to installation of a metal roof system or mechanically fastened tile roof system. It provides secondary protection against water penetration after installation of a metal roof system. It features a removable treated release film on the adhesive side for convenient installation and handling. TW Metal & Tile Underlayment can be left exposed for up to 120 days and is used under metal roofs, mechanically fastened tile, Slate, wood Shakes, Asphalt and composite Shingles.