Built-Up (BUR)

Built-Up Roofing Systems or B.U.R. systems have been used in the United States for over 100 years. It is designed for low sloping or flat roofs. They are usually made of alternation layers of reinforcing fabrics called roofing felts or ply sheets that create a finished “crust” and are sometimes referred to as tar and gravel roofs. They are built up by alternating layers of asphalt or coal tar saturated felts or fiberglass mat roofing sheets. They can have differing amounts of layers called plies and are considered fully applied when positioned directly on the roof’s deck or insulation.

The asphalt or coal tar is heated in a kettle or tanker and then applied by mop or spreader. Surfacings for BUR systems include aggregates like gravel, slag, or mineral granules, glass fiber, or mineral surface cap sheets, hot asphalt mopped over the entire surface, or aluminum coatings.

Built-Up Roofing Systems can be very durable and have a long life span if they are carefully installed, with multiple layers, and with quality bitumen, felts, and flashings. It can be used in both new and existing construction projects and building. They have very little flexibility and should only be used on roof decks that have minimal movement. BUR systems do need occasional maintenance to extend their service life.

Jottan-Jorel uses trusted brands such as Johns Manville, GAF, and Tremco when considering Built-Up Roofing Systems as a possibility in your roofing project.

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