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.