Main reasons for cracking of gypsum board ceiling

The strength of gypsum board will be reduced when it is soaked for a long time or continuously, so the wet board must not be installed; high temperature has a certain impact on the strength of paper faced gypsum board. When the ambient temperature of gypsum reaches 42 degrees, the solidified gypsum will begin to change the crystal structure and damage the strength, so the gypsum board can not be directly connected with the heater.

Although gypsum board has strong moisture resistance, the paper layer can prolong the time of absorbing water, but it can not prevent water absorption. In the process of installation and construction, for a long time or continuous wetting, the strength of gypsum board will be reduced. Therefore, the wet board must not be constructed and installed. High temperature has a certain effect on the strength of gypsum board. When the ambient temperature of gypsum reaches 42 degrees, the solidified gypsum will begin to change the crystal structure and damage the strength, so the gypsum board can not be directly connected with the heater.

Influenced by the design and construction of light steel keel frame structure installed in ceiling

Reasonable design of keel frame, adoption of qualified materials and parts, and strict control of construction quality are the important guarantee for QST system ceiling not to deform and crack. Any mistake or negligence in any link will lead to deformation and cracking. For example, if the fixation between gypsum board and keel is not in order or fixed firmly, the internal force of the board will be generated and the slab joint will be sheared, which will cause deformation and cracks; if the stiffness and straightness of light steel keel are not enough and the spacing is improper, deformation and cracking will occur.

Caulking technology is the direct factor of the success or failure of joint treatment

The gypsum board ceiling with light steel keel is in a variety of stress states, therefore, the vertical and horizontal joints of gypsum board are affected by various stresses, which requires that joints should be properly reserved between the boards, the caulking material itself has sufficient strength and cohesive force, and also has reasonable joint construction technology and higher operation skills, so as to balance the tensile stress and avoid cracks. At present, there are no clear regulations on the design of caulking materials. Most of the construction units choose the caulking putty at will, and 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 or use mesh cloth to strengthen, which has achieved good results. Therefore, how to grasp the caulking process is very important.

The influence of not following the working procedure and uncivilized construction during the installation of gypsum board ceiling

It is common that after the caulking process is completed, even after the wall paper coating is pasted, the installation of water, electricity and wind on the ceiling of the wall has not been completed, and the installation personnel step on the keel frame or skid the fixed plate, which will cause joint cracking and even deformation of the board surface. Some ceiling design is not accessible, and some operators also step on the secondary keel, so that the skeleton deformation occurs deflection, this situation is common in the rush progress project, we must strengthen management to overcome.