GAF Tigerpaw 48 in x 100 ft 400 sq ft Polypropylene Roof Underlayment Ratcheting Wrenches The kit also includes an The kit also includes an efficient and compact Impact Driver that combines a full 1 125 in Certifications and Listings CSA Certified Covers approximately 4 squares (400 sq ft) excluding laps Moisture control design: helps remove damaging moisture from your roof deck For use with asphaltic shingle roof systems may also be used with non asphaltic systems such as slate wood metal Excellent walkability: special surface helps provide excellent walkability versus conventional felts or typical synthetic underlayments Stronger: non woven construction provides greater tear strength than standard #30 felt Lightweight: at approximately 16 lbs it's easier to load and handle on the roof than conventional felts Cooler to work with: light grey surface is cooler in hot weather than black felts UV resistant: resists UV degradation for up to 180 days