- Type: Modified
- Official Name: Polymer-modified bitumen/Hot-liquid-applied polymer-modified asphalt
- Description: A bitumen modified by including one or more polymers (e.g., atactic polypropylene, styrene butadiene styrene); composite sheets consisting of a polymer-modified bitumen often reinforced with various types of mats or films and sometimes surfaced with films, foils or mineral granules. A waterproofing membrane consisting of a blend of asphalt, styrene butadiene styrene (SBS) rubber polymer and mineral stabilizer, used with or without reinforcing sheets.
- Type: BUR
- Official Name: Built Up Roof
- Description: A continuous, semi-flexible roof membrane consisting of multiple plies of saturated felts, coated felts, fabrics or mats assembled in place with alternate layers of bitumen and surfaced with mineral aggregate, bituminous materials, a liquid-applied coating or a granule-surfaced cap sheet.