GAF WeatherWatch Mineral-Surfaced Rubberized Asphalt Roof Underlayment 36 in x 66.7 ft, 200 sq ft

GAF WeatherWatch Mineral-Surfaced Rubberized Asphalt Roof Underlayment is a premium, professional-grade underlayment engineered to provide superior protection beneath asphalt shingles. Each 36 in × 66.7 ft roll covers 200 sq ft and is designed with durable fiberglass reinforcement and a mineral-surfaced finish, providing exceptional resistance against wind-driven rain, ice dams, and leaks around fasteners.

Because the underlayment is constructed from robust rubberized asphalt, it effectively seals around nails and fasteners, preventing leaks that can cause costly damage. The material is waterproof and provides excellent protection, resisting deterioration under wet conditions and extreme temperatures.

WeatherWatch Leak Barrier is lightweight enough to be easily handled by roofing crews, and its split-back release film allows for quick and hassle-free installation. It offers up to 60 days of UV exposure resistance, allowing ample time for installation before applying the final roofing layer.

• Roll size: 36 in W × 66.7 ft L (200 sq ft coverage)
• Rubberized asphalt material – Fiberglass-reinforced and waterproof
• Slip-resistant mineral-surfaced finish for enhanced installation safety
• Superior sealing capability around nails and fasteners
• UV resistance for up to 60 days
• Ideal under asphalt shingles

Fast, contractor-friendly installation

WeatherWatch is engineered for easy handling and rapid installation. Its split-back release film peels off quickly in layers, significantly reducing installation time and enhancing job-site efficiency. The rolls lay flat to improve ease of installation and minimize wrinkles. This leak barrier uses a peel-and-stick application method, making it highly compatible with asphalt shingle roof systems in residential applications.

Durability in extreme conditions

WeatherWatch passes ASTM D1970 standards and is resistant to harsh environmental conditions, including extreme heat, heavy rain, ice dams, and high winds. Its robust construction and self-sealing capabilities make it especially suitable for use in northern climates where ice dams commonly occur and in southern regions prone to wind-driven rain.

Certified for performance

WeatherWatch is a trusted choice among roofing professionals, meeting critical industry standards such as ASTM D1970, Miami-Dade County Product Control approval, and is listed with the Texas Department of Insurance. It forms part of UL-listed ANSI/UL 790 Class A roofing systems, ensuring reliability and superior protection under asphalt shingles.

Dimensions

Roll: 36 in × 66.7 ft