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Built-up Roofs
Built-up roofs, which are commonly referred to as BUR, have been installed for more than 100 years. These roofs are commonly composed of alternate layers of bitumen and reinforcing fabrics that create a completed membrane. The numbers of plies utilized will vary depending on the specification set for a particular application.Each built-up roof is ‘built-up’ on site utilizing various material components specified. Roofing felts, or ply sheets, are reinforced with organic mats or glass-fiber mats, and are laid out over the roof substrate in a staggered pattern. Typically, asphalt or a cold adhesive product is utilized in-between each ply sheet. The initial ply sheet can either be mechanically fastened or adhered to the underlying substrate, which is dependent on the material composition of the substrate. To complete the roof system a top coat of asphalt or cold adhesive is applied with imbedded aggregate (gravel, mineral granules, etc). Alternatively the roof system can be finished with a mineral surfaced cap sheet, aluminum coating or elastomeric coating.