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How to Overcome Deflection in the Existing Ceiling
To adjust the installed modules for level, a laser level is first mounted on the wall and a continuous horizontal beam is shot just a few inches below all of the modules. The distance between the laser beam and the bottom edges of all the modules is then checked across the entire ceiling to determine the lowest point of the modules and of the ceiling overall.
The leveling process then begins by adjusting the shim screws on the module located at the lowest point of the ceiling until all corners of it measure the same distance from the laser beam. The final adjusted dimension between the laser beam and this lowest module is then used as the benchmark for adjusting all of the remaining modules.
Working out from the first leveled module, repeat the process of adjusting the shim screws until the dimension between the laser beam and all corners of every modules is the same across the entire ceiling. This will result in a perfectly level plane across the bottom edges of all the modules and of the entire coffered ceiling system.