All junctions between the roof waterproofing layer and vertical walls must be flooded. Generally, the waterproof layer of fine stone concrete is directly extended to the vertical wall. 1/4 bricks are picked out from the brick wall and a cement mortar drip line is laid. The flashing height should be greater than 150mm. The steel mesh in the fine stone concrete should also be installed at the same time. bend. Cornice structure: ① For free-falling eaves, you can use cantilever paving panels and use fine stone concrete as the eaves, but you must make good drip lines for the boards and cantilever beams. Fine stone concrete can also be used to directly support the formwork. In addition to the drip line, the length of the overhang should not be too large. There must be negative bending moment steel bars and a floating layer. ②Gutters and overhangs: There are two types: cast-in-place gutters and prefabricated roof panel overhangs. When using cast-in-place gutters, attention should be paid to the cracks and water seepage that may be caused by the difference in deformation between them and the roof panels. When installing a floating layer on the roof panel, the waterproof layer can be protruded about 50mm as a drip line, and it is best to seal it with ointment. When there is no floating layer, the waterproof layer can be directly installed in the gutter and structural steel bars can be added. ③External drainage of eaves: For external drainage with parapets, lateral drainage rainwater outlets are generally used. Grease should be embedded at the joints. It is best to stick a section of roll material or glass cloth on top with waterproof paint, and lay it into the pipe without Less than 50mm. You can also add external eaves and make holes in the parapet.