Roof waterproofing construction of a building in beijing programme
1.5 Key points of operation ① Base treatment: a. The leveling layer must be flat, firm, dense, and free of cracks, peeling and peeling. b. Clean the base course at the node details. The base course where the base course treatment agent is applied shall be dry. c. The joints of parapets, deformation joints, pipes, etc., as well as cornices, gutters, water outlets and other corners, shall be made into rounded corners or obtuse angles. ② Brush the base course treatment agent: evenly brush the base course treatment agent on the treated base course surface with a roller brush or a brush, without missing or exposing the bottom. The hot-melt construction of additional coiled materials can be carried out only after the base treatment agent is painted and the surface is dry (generally subject to non stick). The empty paving part shall not be painted with base treatment agent. ③ Paving additional layer: after the base course treatment agent is dried, a layer of coiled material additional layer shall be paved on the internal and external corners, parapet scuppers, scuppers, gutters, deformation joints, cornices and other detailed structures. The additional layer must be firmly pasted and the surface must be flat. ④ Paving sequence: the principle of "hard before easy" shall be implemented on the working surface at the same elevation. The additional layer of node details shall be waterproof first, and then large area paving shall be done. When paving in large area, the lower part shall be paved first along the water direction, then the higher part, and then the continuous overlapping shall be carried out, and finally the construction of the facade, skylight and other protruding parts shall be carried out; In the same building, if there are high and low spans, the construction can be carried out in the order of "high first and then low", that is, the waterproofing of the high span part should be done first, and then the waterproofing of the low span part. ⑤ Paving direction: the lap joint parallel to the roof ridge is lapped along the flow direction; The lap joint perpendicular to the roof ridge shall be lapped along the dominant wind direction. ⑥ After the laying sequence and direction of coiled materials are determined, snap lines on the base course, and then lay coiled materials.
