The combination of aluminum alloy doors and windows splicing is the way of rainwater leakage, especially in heavy rain and typhoon, more serious.  

Therefore, in terms of design, the installation team should be required to hang glue at the contact point of window frame when splicing on the outdoor side. See the attached drawing of splicing glue.  

The design of cheap aluminum windows for sale frame and wall connection node also directly affects the watertight performance of aluminum alloy doors and windows. The correct way should be to fill the gap of one component foam glue, and the wall glue should choose one component neutral silicone sealant.