In our almost 30-year old Florida home, we have a garage that is about
20-ft X 24-ft. We had the roof completely replaced several years ago and have been doing some upgrades. The garage is a normal garage with a popcorned sheet rock ceiling. Between some dampness from the Florida weather and a few bumps from stuff in the attic, the sheet rock is wavy between the joists in several places and in other places broken away slightly from the joists. The garage door mounts are bolted to the ceiling and the garage is your usual 30-year collection of stored stuff and tools.We could strip the popcorn without much trouble but our question is if there is any way to fix the wavy sheetrock without having to rip everything out of the garage and re-do the entire ceiling (a major project). Would we need to put runners between the joists to screw it back in to between the joists? Is there any quick and easy way to do that if that's the only solution? Once sheet rock warps is it shot or can it be pulled back into alignment (we don't need it perfect, this is just the garage)?
Any suggestions and helpful hints greatly appreciated.