DuPont RoofLiner is an innovative roofing layer made to be used with today's long-lasting shingles, tiles and other roof coverings. It provides water protection in commercial and most residential construction. During construction, RoofLiner can withstand UV rays for up to six months and resists blowoffs and tearing, to help prevent rain and snow from damaging sheathing or walls. Once the roof is finished, RoofLiner provides a durable secondary layer of water protection.