SBS 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 fiber glass yarns. The addition of SBS rubber polymer optimizes the asphalt blend to increase its natural waterproofing properties, adding elongation, elasticity, and flexibility to the sheet. The fiberglass reinforced polyester mat provides strength and stability to the product, yielding a membrane that resists natural forces and other factors on the roof-top. SBS Cap is designed specifically as the top layer for use with SBS Modified Bitumen Systems. SBS Systems are ideal for use on both new construction and reroofing projects.