The U value of the horizontal installation of the insulating glass is improved, and the horizontal and vertical installation of the vacuum insulating glass has no influence on the K value, especially for the daylighting roof.

The air pressure in plateau area is usually lower than 0.85 atmospheric pressure. For the insulating glass produced in plain area, the air pressure in the insulating layer is 1 atmospheric pressure, which will cause cracking and failure when used in plateau area; The internal pressure of vacuum insulating glass is close to zero, so it will not produce expansion crack when used in plateau area, and it can also reduce the atmospheric pressure and stress of vacuum insulating glass compared with low altitude area, so it has more performance advantages than low altitude area.