GAF FeltBuster 0973 Roof Underlayment Gray 48"x250' 1000 sq ft 1 Roll A non-asphaltic, polypropylene roofing underlayment that helps to prevent wind-driven rain from infiltrating under the roof’s shingles.   SPECIFICATIONS (ALL DIMENSIONS ARE NOMINAL) ROLL LENGTH 250' (76.2 m) ROLL WIDTH 48" (1.23 m) ROLL WEIGHT 23 lb. (10.4 kg) APPROX. ROLL COVERAGE 10 squares/roll – 1,000 sq. ft. (92.9 m²) (excludes laps) EXPOSURE Up to 90 days CONSTRUCTION Spunbound polypropylene COATING ON BACK SIDE Slip-resistant   CODES FBC State of Florida Approved MIAMI-DADE COUNTY Miami-Dade County Product Control Approved TDI Texas Department of Insurance Evaluation CSA A123.5 Yes   TESTING METHODS & APPLICABLE STANDARDS ASTM D226 Meets or exceeds requirements ASTM D4869 Meets or exceeds requirements