built-up roof English

Meaning built-up roof meaning

What does built-up roof mean?

built-up roof noun

— (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.