Product Information: 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. Manufacturer's Website Product Specifications Download Certificate Certifications: 2020 NGBS Practice # Practice Points Available Additional Conditions of Use to Earn Points 604.1 Building materials with recycled content are used for two minor and/or two major components of the building. 1-6 points available. 2 This product is used in conjunction with another major product with recycled content. Manufacturer's Comments: CertainTeed's WinterGuard® Granular Waterproofing Shingle Underlayment produced in Shakopee contains a minimum of 25% recycled content. 612.1 The aggregate value of building products from registered ISO 14001 or equivalent production facilities is =1% of the estimated total building materials cost. 1 point awarded per %; 10 points max. 1 Product comprises a minimum of 1% of the total building materials cost. Manufacturer's Comments: 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.