What technical requirements define tpo roof vs modified bitumen for asphalt or bitumen modification?

TPO (Thermoplastic Olefin) roofs and modified bitumen roofs differ in several technical requirements. TPO roofs are single-ply membranes made from a blend of polypropylene and ethylene-propylene rubber, requiring mechanical fastening or adhesive for installation. They offer UV resistance and energy efficiency. Modified bitumen, on the other hand, consists of asphalt modified with polymers, requiring torch-applied or cold adhesive methods for installation. It provides excellent waterproofing and durability but may have lower energy efficiency compared to TPO.