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One, uneven ceiling
(a) Phenomenon
The ceiling is uneven, sloping or partially wavy.
(b) Reasons
1. The elevation of the ceiling was not identified, or the line was not clear, and the local elevation was wrong.
2. The ceiling spacing is too large and the keel deforms too much.
3. Wooden keel ceiling wood moisture content, shrinkage deformation.
4. When using wood screws, the distance between the screws and the edge of the gypsum board is inconsistent.
(III) Measures
1. The water column method is used to find the elevation line around the wall. The bullet line is clear and the position is accurate.
2. Light steel keel boom spacing should be 1200 ~ 1500 mm, not too large.
3. The wood used meets the requirements and is firmly fixed.
4. The distance between the screw and the edge of the board or the end of the board must not be less than 10 mm, nor more than 16 mm. The middle screw of the plate must not be more than 200 mm apart.
Second, paper plaster ceiling seam cracking
(a) Phenomenon
Gypsum board ceiling, after a period of time, cracks in the gypsum board joints.
(b) Reasons
1. The structure of the slot joints is not reasonable.
2. Gypsum board quality is poor, expansion and contraction deformation.
3. Caulking putty quality is poor.
4. Improper construction measures.
5. Ceiling keel is not fixed.
Ceiling installation
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