Have this GAF StormGuard Film-Surfaced Peel and Stick Roof Leak Barrier Roll delivered to your job site. Looks better: fiberglass reinforcement helps resist wrinkling/buckling lays flatter under shingles. Dependable: self-seals around nails or metal roofing fasteners. Saves labor: split-back release film peels off in layers for faster installation. Keeps water out of the most vulnerable areas of your roof, including the eaves, rakes, valleys and around the chimneys.