Polypropylene Synthetic Roofing Underlayment Contractor friendly Roloshield™ is lightweight, stronger than felt, and is faster to install. Use less rolls to cover more of the roof and lower your installed cost by using this 100% polypropylene synthetic roofing underlayment. Roloshield™ lays flat and is water resistant with superior drapability in valleys and on ridges and hips. Speedy installation is achieved by using the Roloshield™ pre-printed nailing pattern. Extended UV resistance provides installation opportunities on hot sunny days and provides a cooler working surface. Roloshield™ is Class A fire rated and code approved. The new and improved Roloshield™ lineup has an added slip resistant layer for every product level. With all four products having ICC and Miami-Dade approvals, the new Roloshield™ lineup offers a range of economical to high end options with code-compliant quality for every product from Plus to Extreme. 10 squares per roll 48"x 250 lineal ft. Class A fire rating 0.06 permeability 11 mil thickness -40°F to 240°F temperature range Tear resistance - 35 lbs. Tensile Strength - 90 lbs.