The state of high-rise residential building doors and windows materials are not allowed to use steel profiles are expressly provided?
The state of high-rise residential building doors and windows materials are not allowed to use steel profiles should be allowed. We are a lot of these are more than 20 layers of plastic steel `` also used.
Plastic can not be used mainly to see its ability to withstand wind pressure can not meet the requirements, and the state did not force the request. At present, only Qinghai is limited to plastic steel, it is because the UV is relatively strong in Qinghai, steel weather resistance is not good aluminum. In fact, as early as ten years ago, steel doors and windows can be used in the tall buildings in Xiamen, indicating the use of absolutely no problem, provided that your doors and windows must be reasonable design, through the local fifty years once the wind. But also in the doors and windows production and installation process to comply with the specification.
Allows the use of steel profiles.
The provisions of the doors and windows with the number of layers does not matter. Now energy-saving requirements, no matter what material, as long as the energy-saving requirements on the line. Aluminum need to use heat type, more expensive, so the use of steel is more common.
