Premium-grade WeatherMaster® Pro-Grade Ice & Water Underlayment is a fabric-faced, high-temperature, modified composite roof underlayment suitable for all roofing applications. WeatherMaster® Pro-Grade Ice & Water Underlayment underlayment is self-adhesive and can be used either as primary underlayment or as flashing tape to provide a secondary water barrier. Its SBS-modified asphalt coating prevents moisture entry by sealing uniformly around nails. WeatherMaster® Pro-Grade Ice & Water Underlayment includes a tough, slip-resistant, poly-fabric surface that acts as a physical barrier to damage and protects against UV degradation and extreme weather.