Which factors affect 2 ply modified bitumen roofing system in asphalt or bitumen modification systems?

Several factors influence the performance of a 2-ply modified bitumen roofing system. These include the type of polymer used for modification (such as APP or SBS), the quality of the asphalt, the application method (torch-applied, self-adhered, or cold adhesive), environmental conditions during installation, and the substrate preparation. Additionally, proper detailing and maintenance play crucial roles in ensuring the longevity and effectiveness of the roofing system.