The performance of CertainTeed modified bitumen roofing is influenced by several process parameters, including the type and ratio of polymer modifiers (such as SBS or APP), the temperature during the blending process, and the viscosity of the asphalt. Additionally, the thickness of the membrane and the application method (torch, cold adhesive, or self-adhered) also play crucial roles. Proper control of these parameters ensures optimal adhesion, flexibility, and durability of the roofing system.