Anyway, you can see the blue tape on the ceiling where the water caused damage. I don't know if I want them working in here or not.
Jerry
Jerry,
I wouldn't want to work in there if I were the contractor... too much expensive gear that could easily get broken with the tip of a ladder. If that's drywall, which it most likely is, now that it is dry I would just get some 1 5/8" drywall screws, find the joists, and put a screw every 6-8 inches where the ceiling sags or where a seam is split. You barely want the screw head to be recessed into the finish plane of the drywall. Then if you're worried about aesthetics, you could hit it with some drywall compound or "quick dry patcher" (drydex), sand a little, then paint it. I'd at least screw it in though, so you know it's secure and a sheet wont come flopping down on your goodies...
The contractor probably wont be as careful in that room as one might expect.. likely wouldn't cover your racks with plastic or dropcloth (not like you'd want them to do that part anyway...) and probably wouldn't wet-sand the patches to minimize dust. I hate saying this because I hate when customers do this to me, but if I were in your shoes I would be the customer that 'hovers' to make sure they don't damage anything, IF you even let them enter your domain.
Brian