Firestone SBS FR Cap is a modified bitumen membrane featuring a blend of SBS (Styrene-Butadiene-Styrene) rubber polymer and high-quality asphalt reinforced with a strong non-woven polyester mat enhanced with continuous fiberglass yarns. The fiberglass-reinforced polyester mat provides strength and stability to the product, yielding a membrane that resists natural forces and other factors on the rooftop. SBS FR Cap is designed specifically as the top layer for use with Firestone SBS Modified Bitumen Systems. The addition of SBS rubber polymer and fire-retardant materials optimizes the asphalt blend to increase its natural waterproofing properties, adding elongation, elasticity, flexibility and resistance to fire. They are ideal for use on both new construction and re-roofing projects. Firestone SBS FR Cap with UltraWhite granules has a highly reflective surface designed to meet national, state, and local energy code requirements.