WIP 300HT is a high-tensile-strength rubberized asphalt underlayment specifically designed to withstand temperatures. This strong, skid-resistant membrane provides superior protection from water penetration caused by wind-driven rain and ice dams. 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.