What is the primary function of the roofing membrane in a BUR system?

The primary function of the roofing membrane in a Built-Up Roofing (BUR) system is to provide a waterproof barrier. This is crucial for protecting the underlying structure from water infiltration, which can lead to significant damage over time, including leaks, mold growth, and deterioration of building materials. The membrane is specifically designed to withstand various weather conditions and prevent moisture from penetrating through the roofing system.

In the context of a BUR, the roofing membrane is typically composed of multiple layers of bitumen and reinforcing fabrics, which contribute to its durability and waterproof properties. Ensuring that this membrane is intact and functioning effectively is essential for the long-term health and safety of the building.

While decorative finishes, drainage solutions, and insulation support can be functional aspects of a roofing system, their primary functions are ancillary compared to the vital role of the waterproof barrier provided by the membrane.