GAF Deck-Armor Premium Breathable Underlayment provides a critical layer of protection under your asphalt shingles against wind-driven rain and other sources of moisture. Its unique breathable technology allows inside moisture to escape the roof system, helping to prevent premature roof system deterioration. Made of tough synthetic materials, it resists tearing and helps ensure long-lasting protection. Each roll of Deck-Armor contains 1000 sq. ft., excluding laps
400-sq ft of UV stabilized polypropylene roof deck protection
Helps prevent inside moisture from becoming trapped within your roofing system causing mold, mildew, and expensive structural damage
Provides long-lasting leak protection
Unlike conventional asphalt felts, resists wrinkling or buckling, so it lets your shingles lay flatter for a better looking roof
Exceptionally strong with great tear strength
Long-lasting protection: up to a lifetime limited warranty when installed on lifetime shingle roofs
Special slip-resistant surface provides enhanced walk ability, even on steeper-pitched roofs
Light blue surface is cooler in hot weather than conventional black felts
Spun-bound design is easy to cut