WeatherMaster® 200 (Granular) underlayment is a self-adhesive composite underlayment. The adhesive layer is composed of a proprietary modified asphalt, reinforced with an extra heavy fiberglass mat.
The surfacing of opaque granules provides excellent traction and protection from UV radiation and weathering. The self-adhesive side is covered with a split release sheet which is removed during installation.
WeatherMaster® 200 (Granular) underlayment composite is 47 mils (1.3mm) thick and is supplied in two square (3 ft x 66.6 ft ) (0.9m x 22m) rolls. WeatherMaster® Underlayment is self-adhesive and cold-applied. No special adhesives, heat or equipment are necessary to install WeatherMaster® 200 (Granular) underlayment under normal dry conditions of 45°F or warmer.
WeatherMaster® 200 (Granular) underlayment provides a secondary layer of waterproofing protection needed to help prevent damage from ice dams and windblown rain. This self-adhering modified bitumen underlayment creates a watertight barrier by sealing to the deck and around nails to provide continuous protection year after year. WeatherMaster® helps protect the entire deck of a properly ventilated roof or just those problem areas where water collects or drainage is slow. And, since it can go under any roofing material from asphalt shingles to tile, you can enjoy maximum protection with the architectural look you want.