After at least 24 h from applying the primer on the whole surface and on the projecting parts, the distilled bitumen polymer waterproof membrane will then be torch bonded in full adhesion. The sheets of membrane unrolled parallel to the line of maximum pitch, should be overlapped 10 cm longitudinally and 15 cm at the top, and continuously torch-bonded to the substrate and along the overlaps. They will also be turned up and torch bonded to the vertical parts. The upper layer of the waterproof covering will be composed of a distilled bitumen polymer waterproofing membrane with CE marking in accordance with UN EN 14695 for laying under bituminous conglomerate. The sheets on the second layer will be laid overlapping by 10 cm longitudinally and 15 cm transversally, across the overlaps of the first layer, and torch-bonded to the whole surface and the overlaps. The waterproof covering is turned up on the vertical parts at a height of least 20 cm above the level of the paving.