First, during the renovation, if you want to remove the doors and windows, the wall may be damaged during the removal process, so the doors and windows must be replaced first, and then the next decoration. The decoration industry mainly confirms the profiles first. The quality of the profile will also determine the grade of the entire door and window, sealing and aging practicality and other issues, so the purchase of profiles needs to be cautious.

Second, when purchasing, you must go to the regular building materials market. The roadside stall processing equipment is simple, and accuracy and strength cannot be guaranteed. Especially for plastic steel doors and windows, they make the steel lining of steel doors and windows inferior in quality. Even without steel lining, other accessories are also very poor.

Third, the exterior color of the model steel window should be blue and white. The color is white or gray, indicating that the stable components in the material are not enough, and aging is easy to aging and yellow.

Fourth, check whether the hardware is flexible and smooth.

Fifth, the lower part of the sliding window frame is an aluminum plate, which is easy to replace.

Sixth, the seal of the sliding window should be fixed in the middle, which is the key to the quality of the sliding window seal.

Seventh, the sealing tape of the flat window should be free to replace, because the sealing strip has a shorter life than the window.

Eighth, during the installation process, it is necessary to supervise the horizontal and vertical correction of doors and windows. Window frames and walls are filled with styrofoam, and the outside of the window frames must be sealed with silicone or sealant to prevent water penetration. After installation, the protective film must be removed, otherwise the service life of the doors and windows will be reduced.