1. Due to the lack of management on the protection of finished products due to the mutual cooperation between civil engineering department and installation department, the window frame is often damaged and deformed, and leakage is caused. Some projects adopt thin aluminum alloy window frame materials, which are not rigid enough and also easy to cause window frame deformation, forming leakage. Aluminum alloy or plastic steel doors, window frames and reserved holes are not filled and sealed with flexible materials, which is affected by temperature deformation, The joint will crack, which will cause the seepage channel.

2. The quality of glass glue caulking is not high, or the glass glue is aged, the glue edge is shell, and rainwater is immersed in the gap along the adhesive edge, so it can not play the role of waterproof infiltration.

3. Some projects fix the window glass installation, only use aluminum alloy strip to fix, but not with glass glue seal, for waterproof treatment.

4. Some aluminum alloy or plastic steel windows are not waterproof, the inner edge plate of the bottom frame of push and pull window is not higher than the outer edge, and the water passes through the guide rail wool under the action of wind force and flows into the room through the inner edge plate.

5. The bottom of some aluminum alloy or plastic steel windows is basically flat with the windowsill line. All rainwater on the glass windows is collected at the lower part of the window frame, and immersed in the room through the junction between the window sill and the lower frame.