| 释义 |
built-up roofing
built-up roofing[′bilt‚əp ′rüf·iŋ] (materials) A seamless piece of flexible, waterproofed roofing material consisting of plies of felt mopped with asphalt or pitch. built-up roofingFlat roof covered with multiple layers of roofing felt, secured with layers of hot tar, and topped with a layer of crushed stone. See also: Roofbuilt-up roofing, composition roofing, felt-and-gravel roofing, gravel roofing  built-up roofing A continuous roof covering made up of laminations or plies of saturated or coated roofing felts, alternated with layers of asphalt or coal-tar pitch and surfaced with a layer of gravel or slag in a heavy coat of asphalt or coal-tar pitch or finished with a cap sheet; generally used on flat or low-pitched roofs. Also see tar-and-gravel roofing.AcronymsSeeBUR |