HPR Glasfelts are heavy-duty, asphalt-saturated fiberglass mats used as ply sheets in the construction of high-performance built-up roofs. They are also used to construct and maintain built-up roofing and membrane waterproofing systems. The mat is made of fiberglass monofilaments bonded with a water-resistant melamine binder and reinforced with fiberglass strands. It is coated with high-quality, roofing-grade asphalt and dusted with fine sand to prevent sticking. The asphalt-impregnated glass mat shall neither crack nor be so sticky as to cause tearing upon being unrolled at ambient temperatures of about 50°F (10°C). HPR Glasfelt meets and exceeds ASTM D 2178 and Type IV.
