A high-tensile-strength rubberized asphalt underlayment specifically designed to withstand temperatures up to 250F (121C). Ideal for use under metal including copper, zinc and COR-TEN (consult technical department for installation instructions), it can also be used under synthetic, concrete and clay tiles and asphalt shingles. This strong, skid-resistant membrane is available in either black or white and provides superior protection from water penetration caused by wind-driven rain and ice dams. Protects the roof structure from water seepage caused by ice dams and wind-driven rains. Seals around roofing nails, staples and screws. Split-release film provides easier, faster installation. Resists cracking, drying and rotting, providing long-term waterproofing performance and low lifecycle cost. Concealed waterproofing system will not detract from the architectural aesthetics of the primary roofing system. Exposed rubberized asphalt bead along the membrane edge ensures watertightness of lap seams.