What is the relationship between gypsum board cracking and wet weather?

Gypsum board can be said to be a kind of board with excellent performance in building materials. This is because the gypsum board has a microporous structure inside, which makes the gypsum board have the characteristics of "gypsum breathing". When the air humidity changes, it can absorb the indoor humidity and send it out again quickly. The linear expansion and contraction of gypsum board in this state is very small. Even if the humidity in the air reaches 90%, the lateral ratio of the maximum expansion and contraction rate of gypsum board within 24 hours is only 0.0 15%. Therefore, this slight expansion and contraction is not the main reason for plate deformation and joint cracking.

The structure of gypsum board is a board with gypsum core and facing paper firmly bonded together. Face paper mainly plays the role of bearing tension and strengthening, and the face paper layer has a great influence on the quality of the plate. Cardboard with weak tissue paper is unqualified. Gypsum board also has strong moisture resistance. Protecting the paper layer will prolong the time of water absorption of the board, but it cannot prevent the board from absorbing water.

In the process of plate installation and construction, long-term or continuous humidity will reduce the strength of gypsum board. Therefore, the wet board may not be installed in the construction, but the strength and deformation resistance of the wet board can still be restored after drying and ventilation. High temperature will also have a certain impact on the strength of gypsum board, because when the ambient temperature of gypsum reaches 42℃, the solidified gypsum will begin to change its crystal structure and destroy the strength of gypsum board, so gypsum board cannot be directly connected with the heater.

It can be seen that although the decoration construction environment and weather will have a certain impact on gypsum board, as long as it is properly stored, it can avoid the board from cracking due to moisture. However, the weather in the south is often wet. If you are really worried when decorating, you must choose gypsum board with greater strength and toughness, or choose moisture-proof gypsum board or water-resistant gypsum board that is more suitable for the present environment, so that you can create better living conditions during and after the decoration.