built-up roof
Isaac Kremer/ July 3, 2024/ / 0 comments
A water-resistant coating on a low-slope roof composed of asphalt mopped on a flexible material; asphalt- or tar-soaked canvas held down by wood battens or gravel; several overlapping layers of roofing felt sealed with a heated asphalt compound and usually protected by spread gravel on the top surface; types include three ply, four ply, gravel roof, slag roof. Also known as ready roofing. (Bucher, 1996)