Whether your design solution calls for a pre-manufactured Modified Bitumen membrane system or a standard built-up system, Firestone is uniquely positioned to meet your asphalt roofing system requirements. Firestone manufactures a diverse product line of base sheets, ply sheets, and cap sheets along with installation tools to give you a single source for quality asphalt-based roofing materials. Firestone SBS Firestone BUR Firestone Self-Adhered BaseUltraWhite Granulated Cap Sheets