Built-up Roofing
Built-up roofing (BUR) is a time-tested and highly efficient solution for commercial roofing needs. Designed for low-slope or flat roof structures, BUR systems involve the installation of multiple layers of bitumen and reinforcing fabrics, creating a finished membrane that guarantees a high degree of waterproofing and durability.
- Long-lasting
- Superior mechanical protection (e.g. hail, falling debris)
- Water and UV protection
- Heavy and time-consuming
Bitumen, a semi-solid hydrocarbon product, is the key component of BUR systems. There are two types: asphalt, which is heated until it becomes liquid and then applied to the fabric, and coal tar, which has even better waterproofing qualities.
The reinforcing fabrics, also called roofing felts or ply sheets, are made from glass-fiber or organic mats. These layers are embedded in the bitumen to reinforce the membrane and provide a robust and enduring roof system. The number of ply sheets used can be customized depending on the specific needs and budget of the project.
The final component of BUR systems is the surfacing material. This can range from gravel or mineral cap sheets to specially coated glass-fiber surfacing. This layer ensures the roof can withstand the elements, protects against UV radiation, and provides fire resistance.
One of the main advantages of built-up roofing is its longevity. With proper installation and maintenance. It also provides excellent waterproofing and ultra-violet protection. Furthermore, thanks to the multiple layers, BUR systems have superior resistance to mechanical damage and weathering, ensuring the underlying structure is well protected.
However, it’s essential to acknowledge that BUR systems might not be suitable for all situations. They require expert installation, and the process can be time-consuming and disruptive. Moreover, BUR systems may be heavier than single-ply or metal roofs, so the building must be able to support the additional weight.