built-up roof

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English[edit]

Noun[edit]

built-up roof (plural built-up roofs)

  1. (roofing) A continuous, semi-flexible roof membrane, consisting of multiple plies of saturated felts, coated felts, fabrics or mats assembled in place with alternate layers of bitumen, and surfaced with mineral aggregate, bituminous materials, a liquid-applied coating or a granule-surfaced cap sheet.