Generally, the following areas of metal roof need to be waterproof: horizontal lap joint, vertical lap joint, fan outlet, pipe extending from roof, air conditioning pipe, lighting board around, ridge, gutter, joint between metal plate and parapet, screw fastener and other weak links of metal roof waterproof.

预处理：

Pretreatment:

施工前仔细检查金属屋面，确保金属屋面牢固、干净、无锈蚀、无冰冻物，不符合上述情况则分别作如下处理：

Before construction, the metal roof shall be carefully inspected to ensure that the metal roof is firm, clean, free from rust and frozen objects. If the above conditions are not met, the following measures shall be taken respectively:

A、更换已生锈固件,在适当的位置增加固件.

A. Replace the rusted firmware and add the firmware at the appropriate position

B、用除锈砂纸将生锈区域打磨干净,直呈现金属本色,然后涂一层基层涂料.

B. Grind the rusted area with derusting sandpaper until it is metallic, and then apply a layer of base coat

C、冰冻物，灰尘及其它脏物.

C. Remove frozen objects, dust and other dirt

施工工艺：

Construction technology:

A、金属屋面搭接处:金属屋面搭接处先涂一层基层涂料，在其仍为湿润时，把15～20厘米宽的聚酯布嵌入其中，再从上面用基层涂料充分浸润聚酯布，以全干。

A. Metal roof lap joint: a layer of base coating shall be applied at the joint of metal roof. When it is still wet, the polyester cloth with a width of 15-20 cm shall be embedded into the coating, and then the polyester cloth shall be fully soaked with the base coating from the top until it is completely dry.

B、金属屋面的突出物(如烟囱、出气孔、风机口等):裁剪尺寸、形状合适的缝织聚酯布，并按技术要求裁剪好，在突出物周围涂一层基层涂料，把裁剪好的缝织聚酯布铺于其上，再从上面用基层涂料充分浸润聚酯布，确保不起泡、不起皱。

B. Protrusion of metal roof (such as chimney, air outlet, fan mouth, etc.): cut the sewing polyester cloth with appropriate size and shape, and cut it according to the technical requirements. Coat a layer of base coating around the protrusion, spread the cut seam woven polyester cloth on it, and then fully soak the polyester cloth with base coating from the above to ensure no blistering and wrinkling.

C、金属屋面固件：用10㎝×10㎝的缝织聚酯布，按上述同样的方法处理。

C. Metal roof fixings: 10 cm × 10 cm polyester fabric shall be sewn and woven in the same way as above.

D、金属屋面天沟：天沟搭接缝, 落水口等处先用金属屋面防水系统进行局部防水处理，然后在更大防水范围涂一层涂料, 在其仍为湿润时铺上聚酯布, 再从上面用浆料充分浸润聚酯布, 以全干. 少12小时后, 然后再涂一层浆料.

D. Metal roof gutter: the metal roof waterproof system shall be used for local waterproof treatment at gutter lap joint and water outlet, and then a layer of coating shall be applied in a larger waterproof range, and polyester cloth shall be laid when it is still wet, and then the polyester cloth shall be fully soaked with slurry from above until it is completely dry. After at least 12 hours, a layer of slurry shall be applied

E、在做好防水处理的区域涂二层表层涂料，表层涂料的总涂覆率为35m2/20升(可以一次涂刷，但建议分两次涂刷，保持总涂覆率不变)。

E. Two layers of surface coating shall be applied in the area with good waterproof treatment, and the total coating rate of surface coating is 35m2 / 20L (it can be applied once, but it is recommended to brush twice, keeping the total coating rate unchanged).

F、基层涂料的单层的涂覆率为40m2/20升，聚酯布的利用率为百分之90

F. The coating rate of single layer of base coating is 40 m2 / 20 L, and the utilization rate of polyester cloth is 90%