How to solve the gypsum board ceiling cracks caused by the subsidence of the steel structure?

First, glass glue should be used between the gaps.

Second, use kraft paper again. >>>More

That is the top surface of the moisture, water vapor, there is a wooden keel where there will be white, no keel will be dark, the reason may be that the roof ventilation is not good, the quality of the gypsum board used in the ceiling is too poor, the solution: 1, the cost of re-ceilinging is too high 2, re-scrape putty, paint, treat the symptoms but not the root cause, in a few years will be like this, 3, if it does not affect the use, make do with the use of it,

Here's how to fix it:

1. Laying direction, transverse and longitudinal fixation, the strength performance and deformation of gypsum board are determined according to the direction, the longitudinal performance of the board is superior to the transverse, so the ceiling is not allowed to be parallel to the longitudinal and overlying keel, should be perpendicular to the keel, gypsum board must be installed in a stress-free state, the installation of the ceiling board is temporarily supported by wooden support, and the board is pressed with the skeleton, the support can be revoked only after the screw is fixed, and when the fixed plate is installed, it is fixed from the middle of the board to the four sides, and no more points are allowed to work at the same time. >>>More

If you do that, the top will not be flat.

First of all, the bottom surface of the I-beam of the compartment itself will not be flat, and the weight pressed on it will cause it to be high and low. Also, when installing the I-beam, its perimeter is not necessarily horizontal. >>>More

There is no other way but to rework.