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

• Brand Name: Henry
• Width: 3 ft.
• Length: 33.3 ft.
• Material: Fiberglass
• Product Type: Self-Adhesive Shingle Underlayment
• Weight per Sheet: 15 lb
• Color: Blue
• Coverage Area per Package: 100 sq ft