drywall
I've had a contractor doing work at my house for months now. All the while, they had drywall waiting to install, leaning against a wall.
Now the drywall has an obvious bend to it due to being stored in such a way. Should I tell them to get new drywall, or will it mount fully flat?
You could use something like this:
Cut a hole in the sheetrock according to the template, and when you tighten the screws, the tabs tighten against the back of the sheetrock to hold in place. You then pull the cable through and use a plate like this:
If it was me, I'd cut away the bad drywall and replace it with 1/2" hardi board. That'll give a flat, solid and waterproof substrate for your tiles, in contrast to the beaten up drywall you've got now.
Oh, and be sure to thoroughly caulk the gap between the drywall and the hardi.
Best Answer
Drywall that has warped from leaning against a wall like yours should be laid flat on the floor in stacks that won’t overload the floor joists specifications.
After a couple of days the bend should be gone.
Do not attempt to install without allowing the boards to flatten out because trying to force the curvature out with screws will not work and the screws will be pulled through the drywall attempting to overcome the warpage.