The type of modified bitumen roofing significantly influences performance in modified asphalt applications. Styrene-Butadiene-Styrene (SBS) provides enhanced flexibility and elasticity, making it ideal for areas with temperature fluctuations. At the same time, Atactic Polypropylene (APP) offers superior UV resistance and durability, suitable for high-temperature environments. The choice between SBS and APP affects adhesion, lifespan, and resistance to environmental stressors, ultimately impacting the overall effectiveness and longevity of the roofing system.