WDL-S Plastomer（APP）modified bitumen Waterproofing coil membrane is flaky modified bituminous waterproof sheet of uniform thickness which is made of atactic polypropylene (APP) or polyolefin polymer (APAO, APO) or other modifier and high-quality bitumen as raw material, with high-quality polyester long-fiber base fabric as the enhancement layer, and with the surface covered with polyethylene film (PE), fine sand (S) and mineral aggregates (M) on the surface.