Several factors influence self-adhered modified bitumen roofing materials in asphalt or bitumen modification systems. Key factors include the type and quality of the polymer modifiers used, the application temperature, substrate surface preparation, and environmental conditions during installation. Additionally, the thickness of the membrane and the presence of additives can impact adhesion and performance. Proper installation techniques and compatibility with underlying materials also play crucial roles in ensuring the longevity and effectiveness of the roofing system.