Although the plasterboard has strong moisture resistance, the paper layer can prolong the time when the board inhales water, but it can not prevent water absorption. During installation and construction, the strength of gypsum board will be reduced for a long time or continuous damp soaking. Therefore, the damp plate must not be constructed and installed. High temperature has certain influence on the strength of paper plasterboard. As the ambient temperature of gypsum reaches 42°, the solidified gypsum will begin to change the crystalline structure and make the strength damaged, so the gypsum board can not be directly connected with the heater and so on. Jointing process is the direct factor for the success or failure of joint treatment Light steel keel gypsum board ceiling is in a variety of stress state, therefore, the vertical and horizontal joints of gypsum board are affected by various stresses, which requires that the joint between the board should be properly left, the seam material itself has sufficient strength and adhesion, but also has a reasonable joint construction technology and high operation skills to balance the tensile stress, to avoid cracks. At present, there is no clear stipulation on the design of the joint material, most of the construction units choose the joint putty arbitrarily, its strength can not meet the requirements; some construction units use high-grade rubber, but the price is expensive; some construction units use double-layer perforated paper tape to strengthen, or mesh cloth to strengthen, to achieve good results. Therefore, how to grasp the seaming process is very important. 

       Influenced by the design and construction of light steel keel frame structure installed with ceiling A reasonable design of dragon skeleton, the adoption of qualified materials and parts, and strict grasp of construction quality are important guarantees to ensure that the ceiling of qst system is not deformed and cracked. Any one of the links errors, negligence will lead to deformation and cracking. For example, the fixing between the plasterboard and the keel, if not in order or the fixing is not firm, so that the plate produces internal force, the joint of the plate is cut, it will cause deformation and crack; the stiffness and straightness of the light steel keel is not enough, and the spacing is improper, it will produce deformation and cracking. The influence of non-standard working procedure and uncivilized construction on the installation of gypsum board ceiling When the jointing process is completed, even after the wallpaper coating is finished, the installation of water, electricity and wind on the ceiling of the wall has not been completed. Some ceiling design is not human, some operators also step on the secondary keel, so that the skeleton deformation deflection, especially in the progress of the project is common, must strengthen management, to overcome.