What are the primary components of a Built-Up Roofing system?

The primary components of a Built-Up Roofing (BUR) system are base sheets, felt layers, and bitumen. Each of these elements plays a crucial role in the construction and performance of BUR.

Base sheets provide a foundational layer that enhances the structural integrity of the roofing system. They are often made from fiberglass or polyester materials and serve as a durable substrate for the subsequent layers.

Felt layers, typically composed of fiberglass or organic materials, are then laid over the base sheet. These felts are saturated with bitumen, which acts as a waterproofing agent. The multiple layers of felt are essential for creating a robust and weather-resistant barrier on the roof.

Bitumen, commonly in the form of asphalt, is used to adhere the felt layers together and protect against moisture penetration. When these layers are installed in a traditional BUR system, they create a thick, layered roof membrane that provides reliable waterproofing and insulation.

This combination of base sheets, felt layers, and bitumen is what distinctly characterizes a Built-Up Roofing system, making it different from the other roofing systems that utilize shingles, gutters, or other materials.