A roof consisting of multiple plies of roof felts laminated together with bitumen. Built-up roof material can consist of bitumen-saturated felt, coated felt, polyester felt or other fabrics. A surfacing is generally applied and can be asphalt, aggregate (gravel or slag), emulsion or a granule-surfaced cap sheet. Built-up roofing is one of the oldest and most reliable ways of installing a new roof. It was first known as composition roofing and started in the 1840's. BUR.'s are generally installed with asphalt, and have three basic components - (1) the waterproofing component, (2) the reinforcing component, and (3) the surfacing component which is used to protect the other components from the elements.

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