How is BUR typically applied?

BUR, or Built-Up Roofing, is typically applied by layering hot or cold bitumen with felts or mats. This method involves the application of multiple layers, which consist of alternating layers of bitumen and reinforcing materials such as roofing felts or mats.

The bitumen acts as both an adhesive and a protective sealer, integrating the layers and forming a durable and waterproof surface. The number of layers can vary, but a typical BUR system may consist of three or more layers, creating a thick, resilient membrane that can withstand various weather conditions.

This layering process contributes to the overall strength and longevity of the roof, making it a popular choice for flat or low-slope roofing applications. In contrast to the other methods mentioned, which either do not align with BUR application practices or involve fundamentally different roofing systems, the use of bitumen with felts is distinctive to BUR. By utilizing this layered technique, BUR roofs provide effective moisture control and a robust resistance to wear over time.