I am in the process of covering over a textured ceiling with new 1/2" sheetrock and then installing a coffered ceiling/crown molding detail throughout the room.
The ceiling has prefab trusses spaced at 24" on center. I installed the sheetrock by screwing through the old sheetrock into the trusses and have found that the one side of the room where the wall meets the ceiling is 3/4" higher than the rest of the ceiling. This might not be a big deal if I was just sheetrocking and walking away but the 3/4" difference will be problematic when installing the beams and crown.
I released the screws on the edge and the nearest truss 24" over and got the sheetrock to hang level but I feel it will sag over time with no way to secure it to something solid. I can run a ledger under the sheetrock to support the edge which will be hidden behind the crown molding but still worry with the nearest support being so far over that the sheetrock will sag over time. I tried screwing the new rock into the old rock but the screw did not pull into the paper far enough for me to spackle over.
Does anyone have any suggestions on securing the sheetrock?