I'm in the midst of finishing my basement. The ceiling is engineered joists 16" on center. There will be no insulation between floors so no weight other than the drywall.. I've just carried down 100 sheets of 1/2" standard drywall. Can I use this for the ceiling or will I need to go back and get some 5/8? I'm planning on screwing the whole ceiling (no nails). Will I have sag problems later on?:rolleyes:

I'm redoing a loft interior in NYC this spring, and we had some trouble with building steel 3-stud corners, altho we followed the builder's manual on this topic. Problem is, I think, the ceilings are 11'11" so the studs are 12 footers trimmed one inch, and because of that they're too likely to warp. We tried using cross pieces to reinforce and setting studs 16" but are still having trouble with firm walls and corners. This will be crucial once we build the bathroom which is meant to have tile walls. ANY advice on this would be extremely helpful. The original loft walls/ceiling are plaster over wire mesh, with wood joists and steel beams. (The floors are what we think is cedar planking, but probably about fifty some years old and painted over). The doors are coming out fine, but they are mounted against an original (plaster) wall on one side. SO how do I frame sturdier corners, and reduce flexibility in steel stud walls?????