Cracks in the ceiling of gypsum board

The cracks in the gypsum board ceiling are closely related to the season, construction and materials. There are two main problems that gypsum board ceilings are prone to, one is that about half a year after the completion of the ceiling, cracks begin to appear at the joints of gypsum board. The solution is to ensure that the gypsum board is fixed in a stress-free state when the gypsum board is suspended.

The spacing between the keel and fastening screws should be constructed in strict accordance with the design requirements; Pay attention to the overall full scraping of putty, and the putty should not be scraped too thickly. The second case is the irregular wavy pattern of the suspended ceiling. The grille around the ceiling or the four corners are uneven, or the wood moisture content is large and shrinks and deforms, which can cause uneven camber; In addition, the keel joint is uneven and hard bending, and the spacing of the boom or hanging bar is too much to cause the keel to deform, which will also cause the uneven ceiling; The top of the wooden boom is split, and the steel bar is not tightened when the boom is used, which will cause irregular wave deformation; For ceiling projects with a large area, it is best to use light steel keels.

To prevent the arching of the ceiling, the ceiling wood should be made of high-quality soft wood, its moisture content should be controlled within 12%, the keel should be straight, there can be no knots of the transverse section, the ceiling construction should be leveled on the wall around the wall, and the surrounding area shall be subject to the level when nailing, and the arching height of the indirect horizontal line is 1 200 of the short span of the room, and the longitudinal arch should be hung evenly.

The crack you said should belong to the masonry quality problem, the main reason is that the construction is not in accordance with the masonry specifications, for example, the block is not at the age of dry bricks on the wall, the maintenance is not in place, etc., and the ash number in the plastering project is too large, the sand and mud content is high, and the plastering process is not right and the wall is not wetted. The safety issue is not big, but it affects the aesthetics. It is said that the root of this house does not meet the requirements of delivery, and it is estimated that they will rework and redo it.

Judging by your narrative, there is a flaw in the quality of the masonry. Generally, it should be the expansion crack of the masonry after masonry, and there will be no potential safety hazards after repair; Check again whether there are masonry tie bars at the junction of masonry and column or masonry, (tie bars are generally set according to the wall height of 500mm, and the spacing is 500) under normal circumstances. The white cloth pasted at another crack should be a mesh cloth, which is also the main measure to reduce the crack.

The quality of masonry should be related to the quality of masonry bricks, mortar marking and the flatness of masonry masonry and the fullness of mortar. If you look at what I said, you will know if there is a security problem.

Cut the crack with a knife for 5-6 miles, and then mix it with AB glue and add it to the seam. In the kraft paper tape, scrape the base, and finally do a good job of latex paint.

That's because the joint keel is not fixed, and only by re-disassembling the gypsum board and adding a new suspension bar can the problem be solved.

The problem of the plate and the plate seam, the seam plate is not placed on the seam!