Several factors influence SBS modified bitumen roofing in asphalt or bitumen modification systems. Key factors include the quality of the SBS polymer, the ratio of SBS to bitumen, the application temperature, and the method of installation. Additionally, environmental conditions such as temperature fluctuations, UV exposure, and moisture levels can affect the performance and longevity of the roofing system. Proper surface preparation and adherence to manufacturer guidelines are also critical for optimal results.