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