The most “recognized” type of roof has been in use in the U.S. for over 100 years. BUR roofs are commonly referred to as “Tar and Gravel” roofs. These roofs are composed of alternating layers of bitumen and reinforcement fabrics (or plies) that create the finished membrane. Many surfacing options are considered on built-up roofing, including gravel, mineral surfaced cap sheets, aluminum, and elastomeric coatings or smooth surfaced