Built-Up Roofing (BUR) is a traditional flat roofing system composed of multiple layers of bitumen and reinforcing fabrics. These layers create a thick, durable membrane that provides excellent waterproofing and UV protection. BUR systems are widely used in commercial buildings due to their proven reliability and long service life. In Vancouver, BUR roofs perform well under heavy rainfall when properly installed with adequate drainage. The gravel or cap sheet surface adds extra protection against weathering and mechanical damage. BUR is valued for its durability, low maintenance requirements, and strong resistance to water penetration.
