What technical requirements define roofing modified bitumen for asphalt or bitumen modification?

Modified bitumen roofing must meet specific technical requirements, including ASTM D6162 or ASTM D6170 standards for performance. Key specifications involve tensile strength, elongation, and low-temperature flexibility. The material should exhibit resistance to UV radiation, weathering, and thermal cycling. Additionally, the bitumen must be modified with polymers, such as APP or SBS, to enhance elasticity and durability. Proper installation techniques and adherence to manufacturer guidelines are also crucial for optimal performance and longevity.