Built-Up Roofs

Built-Up Roofing To Fit Your Needs

Built-up roof membranes are composed of alternating layers of bitumen (either asphalt or rarely coal tar) and reinforcement sheets (felts). Fiberglass felts are typically used for asphalt BURs Historically, ply sheets have been either fiberglass-mat or organic-mat reinforced. Currently organic-mat reinforced ply sheets have largely disappeared from the U.S. market. The asphalt is typically hot applied, however, cold-applied asphalt is available (cold-applied asphalt incorporates solvent). The membrane is either adhered to the substrate in bitumen or a base sheet (i.e., a heavy felt) is mechanically attached.