What is a primary challenge associated with BUR systems?

The primary challenge associated with Built-Up Roofing (BUR) systems is the potential for water pooling if not properly drained. BUR systems consist of multiple layers of roofing felt and bitumen, which creates a flat surface. If this surface does not have adequate drainage, water can accumulate, leading to several issues such as leaks, increased load on the roofing structure, and accelerated deterioration of roofing materials. Effective drainage is essential to maintaining the integrity and longevity of BUR systems, making it a critical factor in their installation and maintenance.

Other challenges, such as the heavy weight of materials, poor insulation properties, and long installation time, can also occur, but they are not as inherently tied to the performance and lifespan of BUR systems as the issue of water pooling is. Proper design and installation can mitigate those concerns, whereas inadequate drainage can significantly compromise the roof's reliability and effectiveness.