What is a "glass mat" in relation to BUR roofing?

A glass mat in the context of BUR (Built-Up Roofing) refers to a type of reinforcement used in certain surfacing materials. It is composed of fiberglass strands that are woven together to create a strong and durable material. This reinforcement enhances the structural integrity of the roofing system, providing resistance to tearing and puncturing, which is particularly important in BUR applications where multiple layers of asphalt are used.

By incorporating glass mats into the BUR system, builders benefit from their lightweight nature and strong performance characteristics. This material helps improve the longevity of the roofing, ensuring better performance under various environmental conditions. The glass mat also functions well with asphalt, as it can withstand exposure to moisture and UV rays, making it suitable for use in roofing applications.

In contrast, the other options refer to different elements that are not related to the structural reinforcement aspect provided by glass mats. For instance, decorative finishes, insulation, and weatherproofing methods serve unique purposes that do not involve the reinforcing qualities that glass mats specifically provide in BUR roofing systems.