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WinterGuard® waterproofing shingle underlayment is the solution for winning the battle against water penetration in your roof's most vulnerable places. WinterGuard is a composite material of asphalt polymers, formed into a rolled sheet.
CertainTeed's WinterGuard® Granular Waterproofing Shingle Underlayment produced in Shakopee contains a minimum of 25% recycled content.
CertainTeed's WinterGuard® Granular Waterproofing Shingle Underlayment is produced at CertainTeed's Shakopee facility, which has obtained ISO 14001 certification for its environmental management system concepts.