Product Information
CertainTeed's proprietary CoolStar granules utilize naturally occuring rock that has been stable for millions of years. This type of roofing graule has been used or over a century with proven success on traditional residential shingles and low-slope membranes. The base mineral granules are 100% opaque to UV radiation and, therefore, will protect the asphalt coating on the roofing membrane, thus maintaining granule coverage.