ã€China Aluminum Industry Network】 1. At present, aluminum alloy or plastic steel doors and window frames are mostly constructed by means of a post-plugging method. That is, doors, window openings and embedded parts are reserved. After the painting is completed, installation of doors and window frames is started. However, it is often reserved that the size of the opening is inaccurate with the size of the door and the window frame, resulting in the size of the gap being large or small, and the packing is not dense, forming a water-filled cavity. Some civil engineering departments and installation departments do not cooperate with each other in the lack of management of finished product protection, which often causes window frames to be deformed to cause leakage; some projects use thin aluminum alloy window frames, which are not sufficiently rigid and can easily cause deformation of window frames. The formation of leakage; 2 aluminum alloy or plastic steel doors, window frames and â–¡ reserved hole is not filled with flexible material packing and sealing, subject to temperature deformation, the joint will inevitably crack, causing water seepage channel. 2. The quality of the glass glue caulking is not high, or the glass glue is aged, and the rubber edge rises from the shell. The rain drips into the gap along the edge of the glue and does not achieve the effect of waterproof penetration. 3. Some engineering fixed window glass installations are only fixed with aluminum alloy strips, but are not sealed with glass glue and waterproofed. 4. Some aluminum alloy or plastic steel windows do not have waterproof design by themselves. The inner edge plate of the bottom frame of the sliding window is not higher than the outer edge. Under the action of the wind, water crosses the rail tops and flows across the inner edge plate into the room. 5. The bottom of the lower frame of some aluminum alloy or plastic steel windows is basically flush with the sill line. The rainwater on the glass windows is all collected in the lower part of the window frame and immersed into the room through the intersection of the window sill and the lower frame of the window.