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Built-up roofing, are commonly referred to by the acronym BUR. They have been in use in the U.S. for more than 100 years. These commercial roof systems are commonly referred to as "tar and gravel" roofs. BUR 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. Built up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation.
The bitumen typically used in 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.
Surfacings for built up roof 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.
Crosby Roofing is a GAF Master Elite commercial roofing contractor with over 30 years in the Texas area. We can provide you with many options customized to meet your needs both in terms of craftsmanship and budget.
Talk to us today about a FREE roof inspection, replacement, estimate or new installation.