What does it mean when BUR is referred to as "multi-ply"?

When BUR is referred to as "multi-ply," it specifically means that the roofing system consists of multiple layers, typically including alternating layers of roofing felts and bitumen. This layered approach is a fundamental characteristic of Built-Up Roofing systems, providing enhanced durability, weather resistance, and protection against various environmental factors.

The multiple layers work together to create a robust and resilient barrier that helps prevent leaks and extends the lifespan of the roof. The use of both roofing felts and bitumen allows for better adhesion and sealing, which is crucial for maintaining the integrity of the roofing system over time. This construction method is a key aspect of BUR that distinguishes it from other roofing systems that may utilize only a single layer or different installation techniques.

Understanding the concept of "multi-ply" is important in recognizing how BUR systems are designed to perform effectively in a variety of conditions, thereby making it a reliable choice for many roofing needs.