• Waterproofing underlayment • Composed of a high tack rubberized asphalt, coated on a non-woven glass fiber mat • Lower surface has a split-release silicone release backing for ease of application • Used at eaves, valleys, flashings, and on low-slope applications to provide watertight protection against the back-up of water resulting from ice dams or wind driven rain • Meets ASTM D1970 standard and is ICC listed • Self-sealing when penetrated by mechanical fasteners or roofing nails • Fully adhered system prevents lateral moisture migration • Sand surfaced for slip-resistance • UL Classified • Class A fire classification under fiber-glass shingles and Class C under organic felt shingles (per ASTM E108/UL 790) • 1.3 mm thickness. • Size Ft=3 x 33.3 • Sq Ft=100