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 roofing

Flat roof covered with multiple layers of roofing felt, secured with layers of hot tar, and topped with a layer of crushed stone. See also: Roof

built-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.