JM Ice and Water Guard™ is a self-adhering membrane composed of rubberized asphalt roofing sheet with a strong inorganic glass mat for reinforcement. SureGrip™ is used under shingles, slate, shakes and tiles. It prevents leaks and damage to decking and internal structures from wind blown rain and water backup due to ice dams. SureGrip™ is also used as a vapor barrier for roofs, walls and floors.