Generally, the metal roof has the following areas that need waterproof treatment: horizontal lap, vertical lap, fan port, protruding roof pipe, air conditioning pipe, around daylighting board, ridge, gutter, junction between metal plate and parapet, screw fastener and other metal roof waterproof weak links.

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

A、更换已生锈固件,在适当的位置增加固件.

A. Replace rusted fasteners and add fasteners at appropriate positions

B、用除锈砂纸将生锈区域打磨干净,直呈现金属本身颜色,然后涂一层基层涂料.

B. Grind the rusted area with derusting sandpaper until it shows the color of the metal itself, and then apply a layer of base paint

C、去除冰冻物，灰尘及其它脏物.

C. Remove ice, dust and other dirt

施工工艺：

Construction process:

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: the metal roof lap joint shall be coated with a layer of base course coating. When it is still wet, insert 15 ~ 20cm wide polyester cloth into it, and then fully soak the polyester cloth with base course coating from above 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. Protrusions of metal roof (such as chimney, air outlet, fan port, etc.): cut the sewn polyester cloth with appropriate size and shape, and cut it according to the technical requirements. Apply a layer of base course coating around the protrusion, lay the cut sewn polyester cloth on it, and then fully infiltrate the polyester cloth with base course coating from 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 fasteners: 10cm × 10cm sewn polyester cloth shall be treated 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: 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. When it is still wet, polyester cloth shall be paved, 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. Apply two layers of surface coating in the area with good waterproof treatment, and the total coating rate of surface coating is 35m2 / 20L (it can be applied at one time, but it is recommended to apply it twice to keep 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90％。

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