built-up roofing

Definition

Construction

  • A continuous roof covering made up of various plies or sheets of saturated or coated felts cemented together with asphalt. The felt sheets are topped with a cap sheet or a flood coat of asphalt or pitch, which may have a surfacing of applied gravel or slag. See also composition roofing, felt-and-gravel roofing, gravel roofing.
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