GAF STORMGUARD 36-in x 66-ft 200-sq ft Polypropylene Roof Underlayment

Help prevent leaks due to water damming in your gutters, wind-driven rain, and in the North damaging ice dams. Special adhesive allows for one-time repositioning, but aggressively adheres over time. Self-seals around nails or metal roofing fasteners. 2.0 square roll size. Can be applied over plywood, wood plank, and all other approved decks.