Built-Up Roofing Installation & Repair in Dallas & Throughout DFW

aerial view of a built up roof on a commercial building

Built-Up Roofing membranes referred to by the acronym BUR, have been in use in the U.S. for more than 100 years. Built-Up roof systems are constructed with layers of felt and bitumen (either asphalt or coal tar pitch) that are applied hot and left to cool. They are then covered with gravel, a mineral sheet cap, or other weather resistant coatings. Generally, BUR systems are three or four-ply. The layering of the bitumen and felt provide enhanced water resistance. These Built-Up Roofing systems are commonly referred to as “tar and gravel” roofs. Built-Up Roofing systems generally are composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane. The number of plies in a cross-section is the number of plies on a roof: The term “four plies” denotes a four-ply roof membrane construction. Sometimes, a base sheet, used as the bottom-most ply, is mechanically fastened. Built up roofs generally are considered to bottommost if applied directly to roof decks or insulation.

Built-Up Roofing Dallas

The reinforcing fabrics also are called roofing felts or ply sheets. Roofing felts are reinforced with either glass-fiber mats or organic mats. Felts are produced in a standard width of 36 inches and metric width of about one meter.

The bitumen typically used in Built-Up Roofing BUR roof systems is asphalt, coal tar or cold-applied adhesive. The asphalt or coal tar is heated in a kettle or tanker and then applied by mop or mechanical spreader. Asphalt is a petroleum product refined from crude oil; coal tar is derived from the distillation of coal. Cold-applied adhesives typically are solvent-based asphalts that don’t have to be heated in a kettle or tanker.

Surfacing’s for built-up roofing systems include aggregate (such as gravel, slag or mineral granules), glass-fiber or mineral surfaced cap sheets, hot asphalt mopped over the entire surface, aluminum coatings or elastomeric coatings.  A Built-Up Roofing system composed of a built-up roof membrane with two or three plies and a polymer-modified bitumen membrane cap sheet is commonly referred to as “hybrid” system. NRCA considers this type to be a polymer modified bitumen membrane system. Click HERE for more information about the GAF BUR roofing system.

Alpine Roofing Construction has 20+ years of commercial roofing experience. We install new roofing systems, maintain existing roofing systems and repair & replace built-up roofing systems. We have experience working on small commercial retail properties to high-rise buildings. No job is too big or too small. Contact Alpine Roofing Construction today for a roofing consultation.

Book an Appointment Today! Dallas: 214-247-1698 Fort Worth: 817-409-8975 Schedule An Appointment Today
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