Definitions for "BUILT-UP ROOF"
Keywords:  asphalt, slag, felt, gravel, mopped
An outer covering of a comparatively flat roof, consisting of several layers of saturated felt. As laid, each layer is mopped with hot tar or asphalt. The top layer is finished with a mineral or rock covering and a special coating.
A roofing material applied in sealed, waterproof layers, where there is only a slight slope to the roof.
Roof composed of multiple layers of asphalt felt laminated with coal tar, pitch or asphalt with a top layer of crushed slag or gravel. Normally issued on flat roofs or those with very slight slope.