What is a common benefit of using modified bitumen in BUR systems?

Using modified bitumen in Built-Up Roofing (BUR) systems is particularly beneficial because it significantly improves flexibility and durability. This is important for roofing applications as flexibility allows the material to better withstand temperature fluctuations, avoiding cracks and failures that can occur with traditional asphalt. Modified bitumen typically incorporates performance-enhancing polymers which also contribute to its resistance to UV radiation, making it more durable over time compared to standard bitumen. This enhanced durability ultimately supports a longer lifespan for the roofing system and reduces the likelihood of repairs or replacement, providing a solid long-term solution for flat and low-slope roofs.

In contrast, while some options may suggest advantages such as lower cost, lower maintenance, or aesthetic appeal, the primary and most recognized benefit of modified bitumen lies in its improved performance characteristics, especially regarding flexibility and overall durability in varying environmental conditions.