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 65 Sq Ft=195