RUBEROID HW Granule FR is a tough, fire-retarding 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 inherently fire retardant polymer modified asphalt and surfaced with mineral granules. RUBEROID HW Granule FR is also an ideal product for repairs of built-up roofing membranes or other modified bitumen systems. RUBEROID HW Granule FR is designed for new roofing and recovering applications as well as the construction of flashings.