Several factors influence the life expectancy of modified bitumen roofs in asphalt or bitumen modification systems. Key factors include the quality of materials used, installation techniques, environmental conditions (such as UV exposure and temperature fluctuations), maintenance practices, and the slope of the roof. Additionally, the presence of moisture and the roof’s drainage system can significantly impact durability. Regular inspections and timely repairs also play a crucial role in extending the lifespan of modified bitumen roofs.