The cost of modified bitumen roofing is influenced by several technical requirements, including the type of polymer used for modification (APP or SBS), the thickness of the membrane, and the method of application (torch-applied, self-adhered, or cold adhesive). Additionally, factors such as the quality of the base materials, reinforcement layers, and the complexity of the roof design can significantly impact overall costs. Proper installation techniques and adherence to local building codes also play a crucial role in pricing.