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From the pages of Fine Homebuilding magazine Leveling an Old Ceiling Steel studs attached to the sides of ceiling joists create a flat surface for new drywall
The leveling method described here results in a perfectly flat ceiling but does nothing to reinforce the structure of the existing ceiling. Where a ceiling is sagging due to major structural problems such as rot, carelessly notched beams, or a sinking foundation, I choose a different approach, which there isn't room to address here. With just one helper, I can fix even the most crooked ceiling in a few hours simply by sistering steel studs to the ceiling joists. It is always worth the time to flatten out a ceiling. I've found that the few hours I spend flattening can save days of aggravation leveling humps with thick coats of joint compound. A flat ceiling makes for a cleaner and easier crown-molding or cabinet installation. My method also is useful when blending an old ceiling to the ceiling of an addition. Stringlines guide the way The first step in the process is to set up a laser level as a reference line (see Laser levels: fast and accurate). Find the ceiling's low point (new ceiling height) by measuring down to the laser beam in various places (#1 in the drawing below). In the corners, drive nails at the new ceiling height by measuring up from the laser line. The nails (#2 in the drawing) hold two stringlines. Tightly stretch the strings (#3 in the drawing) perpendicular to the joists. These strings guide the steel-stud installation.  Steel is lighter and straighter than wood For ceilings less than 1-1/2 in. out of level, 4-in. steel studs will work. Otherwise, 6-in. studs, available at drywall-supply stores, ensure enough overlap to keep the bottom stiff.
If wires or pipes run across the bottom of the joists, notch the studs around them. Where blocking requires notching the top of the stud, it sometimes makes sense to cut off the top flange altogether.
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