What is built-up roofing?

Built-Up Roofing (BUR) consists of multiple layers of bitumen alternated with ply sheets (felts) applied over the roof deck, vapor retarder, and (most often) insulation. BUR roofing systems are particularly advantageous for flat or low-sloped applications. The heart of the system is the membrane which includes the layers of bitumen, which is applied hot, and the reinforcing plies of roofing felt.

With today's technological advances in asphalt science, cold bitumen adhesives can be used in lieu of hot asphalt. More.

Built-up Roofing (or BUR) is the most popular choice of roofing used on commercial, industrial and institutional buildings. BUR is used on flat or low-sloped roofs and consists of multiple layers of bitumen and ply sheets. Components of a BUR system include the roof deck, a vapor retarder, insulation, membrane and surfacing material.

The components are assembled at the job site to actually form the built-up roof. At the heart of this roofing system is the roofing membrane, which consists of roofing bitumen and multiple reinforcing plies of roofing felt. Roofing bitumen is the primary adhesion/waterproofing agent used between roofing plies.

Bitumen arrives at the job site in solid form, but is heated and applied as a liquid. Roofing bitumens may be either a product of petroleum refining (asphalts) or a product of the coal-cooking process (coal tar pitch). Multiple reinforcing “plies” are asphalt-coated roofing sheets or felts installed in three or more layers to strengthen and ... more.

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