Armour AD Roofing Underlayment is a high temperature self-adhered waterproofing membrane made with an advanced Black Butyl rubber adhesive formulation and is designed for use as secondary ice and water protection in steep slope roofing applications. It offers premium protection against water infiltration from snow, ice dams, and wind driven rain. It can be used under most primary roofing materials such as residential or commercial metal,mechanically attached concrete or clay tiles, primed cedar shakes, and asphalt or composite shingles.