The oxidized material doors and windows with cement mortar caulking should be treated with anti-corrosion and rust prevention before hanging on the wall.  

Except for the aluminium door frame facing the wall, the other surface of the window frame is protected by adhesive tape or plastic tape.  

Special attention should be paid to the existence of adhesive tape or plastic tape on the window frame facing the wall, so as not to cause the connection of the joint part is not close, resulting in poor waterproof performance, resulting in water leakage in the gap.