GAF WeatherWatch creates a formidable defense against roof leaks. As a peel and stick underlayment, it bonds directly to the roof deck, forming a watertight barrier against water damage. This mineral-surfaced membrane defends vulnerable areas against ice dams and wind-driven rain. Designed for use with asphalt shingles, it self-seals around fasteners to prevent leaks. With a roll size of 200 square feet, WeatherWatch provides reliable, long-lasting protection for roofs.