GAF StormGuard Film-Surfaced Leak Barrier Rubberized Asphalt Roof Underlayment 36 in x 66.7 ft, 200 sq ft

GAF StormGuard Film-Surfaced Leak Barrier Rubberized Asphalt Roof Underlayment is a professional-grade underlayment engineered to provide superior waterproofing protection beneath asphalt shingles and most metal roofing systems. Each 36 in × 66.7 ft roll covers 200 sq ft and is designed with a fiberglass-reinforced, synthetic patterned blue film surface that provides excellent slip resistance and wet/dry traction during installation.

Because this underlayment is made from durable rubberized asphalt with fiberglass reinforcement, it effectively seals around nails and fasteners, preventing leaks and ensuring a watertight roof deck. StormGuard is significantly stronger and offers better protection against ice dams and wind-driven rain compared to traditional felt underlayments.

StormGuard is easy to handle, featuring a lightweight roll suitable for quick installation by roofing crews. Its high-temperature formulation withstands temperatures up to 250°F and provides UV resistance for up to 90 days, enabling flexible scheduling and reliable protection until the primary roofing material is applied.

• Roll size: 36 in W × 66.7 ft L (200 sq ft coverage)
• Rubberized asphalt material – Waterproof construction with fiberglass reinforcement
• Slip-resistant surface for enhanced installation safety
• Superior strength and sealing capability compared to traditional felt
• UV resistance for up to 90 days
• Ideal under asphalt shingles and metal roofing systems
• Weight: Approx. 67 lbs per roll

Fast, contractor-friendly installation

StormGuard is engineered for easy handling and efficient installation. Its peel-and-stick, self-adhering design eliminates the need for nails or staples, significantly reducing installation time. The rolls lay flat quickly, minimizing wrinkles and providing a secure, smooth surface compatible with asphalt shingles and metal roofing, making it a versatile choice for both residential and commercial applications.

Durability in extreme conditions

StormGuard meets rigorous ASTM D1970 standards and is resistant to extreme weather conditions, including intense heat, severe cold, ice dams, heavy rain, and high winds. Its flexible, durable construction makes it suitable for use in a variety of climates, including cold regions where traditional felt can become stiff and difficult to handle.

Certified for performance

StormGuard is trusted by roofing professionals and meets or exceeds critical industry standards, including ASTM D1970, State of Florida Approval, and Miami-Dade County Product Control Approval. Additionally, it is listed by the Texas Department of Insurance as an acceptable roof underlayment, ensuring reliability and exceptional performance under demanding roofing systems.

Dimensions

Roll: 36 in × 66.7 ft

Weight

Approx. 67 lbs per roll