Features 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 Specifically designed to provide secondary waterproofing protection to shingles as well as prevent ice damage and wind driven rain Meets astm d1970-08 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. Item weight - 66.5 lbs. - SKU: ORGL38133