Products / All Weather Synthetic Nail Base Underlayment

A lightweight synthetic roof underlayment (All Weather NB) for use under asphalt shingles, built from a woven polypropylene scrim with a non-woven top surface. The data sheet lists 48 in x 250 ft rolls of about 23 lb and a 7 mil thickness. It states the product meets ICC-ES AC188 (CCRR-1105), ASTM D4869 Types I through IV, ASTM D226 Type II and CSA A123.3, and lists a Class A fire resistance rating under ASTM E108 and a 20-year limited warranty.