1. During renovation, it is best to replace doors and windows first, as the process of removing windows can damage the interior and exterior walls, before proceeding to the next step of renovation. Homeowners should be clear about which brand of profile to choose. The quality of the profile will determine the overall grade, sealing, and aging of the doors and windows. Homebuyers should not be deceived by the vague concept of "inexpensive plastic steel doors and windows" in the market.

2. When making a purchase, it is essential to visit a reputable building materials market or seek out a manufacturer with a physical factory. Roadside stalls often have rudimentary processing equipment, making it impossible to guarantee the accuracy and strength of their products. This is particularly true for plastic-steel doors and windows, where the lining steel is often of inferior quality or even absent, and other accessories are also subpar.

3. The appearance color of plastic steel doors and windows should be bluish-white. If the color is too white or grayish, it indicates that the stable components in the material are insufficient, and it is prone to aging and yellowing over time.

4. Check whether the hardware components are flexible and smooth.

5. The lower part of the sliding window frame should have aluminum sliding rails to facilitate its replacement.

6. The sealing rubber strip of the casement window should be freely replaceable, as the lifespan of the sealing strip is shorter than that of the window body.

7. The sealing strip of the sliding window sash should have a fixing piece in the middle, which is the key to the sealing performance of the sliding window

8. During the installation process, the correction of doors and windows in both horizontal and vertical directions should be supervised. A gap should be left between the window frame and the wall

The foam rubber is used for filling, and both the inside and outside of the window frame must be sealed with silicone sealant or sealant to prevent water infiltration.

After installation, the protective film must be removed, otherwise it will reduce the lifespan of the doors and windows