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Question:

The roof of the arch problem

You can help me explain the ceiling under the arch of the one hundred points is what it means

Answer:

From the arch for the prevention of deformation, in the installation of artificial let the middle of the keel upward arch, along the direction of short arch from the arch, the arch height of the net span of the length of 1/200
Paper gypsum board ceiling prone to the problem there are two, one case is completed six months after the ceiling, paper gypsum board seams began to crack. When the solution is gypsum board ceiling, make sure that the gypsum board is fixed in a stressless state. Keel and fastening screw spacing to be strictly in accordance with the design requirements of the construction; the whole full of putty to pay attention to, putty do not scratch too thick. The second case is the irregular wave of the ceiling. The ceiling of the surrounding grille or four corners uneven, or the wood moisture content of the occurrence of shrinkage deformation, can cause unevenness of the crown; In addition, the keel joints are hard to bend, boom or hanging tendons between the boss keel deformation, ; Wood boom head splitting, with steel bars do not stretch when the boom, will lead to irregular wave deformation; larger ceiling works, it is best to use light steel keel.
Paint gypsum board ceiling prone to problems are mainly cracks and irregular arch, which has construction and material reasons, there are seasonal reasons. C

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