CertainTeed WinterGuard granular waterproofing underlayment is a barrier for roof decks beneath shingle, slate, and tile roofs. It is a composite of asphalt and polymers formed into a rolled sheet: the asphalt makes it vapor-tight, and the polymers make it elastic and sticky, so it stretches and seals around nails driven through it. Embedded granules give traction during application. It is part of the CertainTeed Integrity Roof System and is warranted to stay watertight for the same period as the shingles above it, up to a maximum of 50 years.

• Granular surface for traction during application
• Waterproofing underlayment for shingle, slate, and tile roofs
• Seals around nails
• Vapor-tight asphalt and polymer composite
• Roll: 2 sq, 36 in. x 65 ft
• Warranty matches the shingles above it, up to 50 years