What is the standard thickness range for BUR membranes?

The standard thickness range for Built-Up Roofing (BUR) membranes typically falls between 2 to 4 inches. This range is determined based on the need for sufficient material to provide durability, waterproofing, and resistance to environmental factors. BUR systems are made from multiple layers (plies) of felt or fabric imbued with asphalt, and the thickness of the membrane contributes significantly to its overall performance and longevity.

Thicker membranes may offer advantages regarding insulation and resistance to wear, but the standard practice often adheres to the 2 to 4 inches range to balance performance with weight and material costs. This range has been established through industry practices and is sufficient for the structural integrity and waterproofing required in various roofing applications.