What is a typical characteristic of BUR roofing?

The characteristic of BUR roofing that stands out is its structure as a multi-layered system that utilizes built-up bitumen. This design features alternating layers of roofing felt (which can be fiberglass or organic materials) and bitumen, usually asphalt, which is applied hot or cold. The use of multiple layers enhances the roof's durability, waterproofing ability, and resistance to various environmental stressors. Each layer contributes to the overall performance of the roofing system, providing added protection against leaks, ultraviolet (UV) rays, and physical damage.

In contrast, a single layer of synthetic material represents a different category of roofing known as single-ply membranes, which do not offer the same level of complexity or layered benefits as BUR. Lightweight materials focus on reducing overall roof weight but do not specifically describe the layered nature of BUR roofing. Lastly, while reflective materials are important for energy efficiency and heat management, BUR is not limited to just reflective technologies; it encompasses a broader multi-layer system approach. Hence, the defining characteristic of BUR roofing is indeed its multi-layered structure combined with built-up bitumen.