RUBEROID HW PLUS GRANULE MEMBRANE is designed for new roofing and recovering applications as well as the construction of flashings. Its core is a strong, resilient, non-woven polyester mat that is coated with a polymer-modified asphalt and surfaced with mineral granules. RUBEROID HW PLUS GRANULE MEMBRANE is a premium SBS modified bitumen membrane that can be installed without the use of hot asphalt. This is also an ideal product for repairs of built-up roofing membranes or other modified bitumen systems.