A tar and gravel roof, also known as a built-up roof (BUR), is a common flat roofing system that consists of multiple layers of bitumen and reinforcing fabrics. These layers are topped with a layer of gravel to protect against UV rays, weathering, and physical damage. The gravel also helps improve drainage and adds weight to keep the roofing materials in place. Visit: https://managemyroof.com/tar-and-gravel-roof/