What should you pay attention to when replacing aluminum windows and doors:
1. During the decoration, since the window removal process will damage the indoor and outdoor walls, it is better to replace the doors and windows first, and then proceed to the next renovation.
2. when shopping, must go to the formal building materials market, the roadside stalls its processing equipment is simple, accuracy and strength can not be guaranteed. Especially for upvc doors and windows, the steel lining steel they made is of inferior quality, even without lining steel, and other accessories are also very poor.
3. the appearance of aluminum windows and doors should be blue and white. The color is too white or gray, indicating that the stable components in the material are not enough, and it is easy to age and turn yellow.
4. Check if the window hardware is flexible and smooth.
5. There should be aluminum slide rails in the lower part of the sliding window frame to facilitate replacement.
6. The sealing strip of the casement window should be freely replaceable because the seal strip is shorter than the life of the window.

7. During the installation process, the horizontal and vertical alignment of the doors and windows should be supervised.

DER has 20 years' experience for manufacturing aluminum windows and doors and get great reputation in domestic and overseas market, and different series of products of DER could meet the customers' needs and requirements all over the world.
We have two factories in Shanghai, one locates in Qingpu district and another in the Songjiang district. The total area of two factories exceeds 150,000 square meters, and the annual output exceeds 300 million US dollars. It's unnecessary for you worry about the delivery time as we have 12 production lines in our two factories, which the capacity is 50,000 sqm per month, about 13000 sqm per week.

If you are interested in our product, please contact me at the below information:

Jasper Wei

Sales Manager

Shanghai DER Building Material Co.,Ltd.

Office:1500 Long Wu Road, Shanghai 200030, PRC

Cell:+86-13162730265

WhatsApp: +86 13162730265

Mail: jasper@der-building.com

Web: www.der-building.com

Plant Web: www.kedocn.com