I was getting ready to tile my basement bathroom and noticed the wall wasn't as flat as I expected. I cut in a hole to take a look and got a nasty surprise. The drywall in my bathroom was glued to the studs rather than screwed. As the house settled over the past 50 years, the paper backing on the drywall tore off at the glued spots leaving a 1-2.5" large gap where it has bowed outwards from compression.
I've been able to use drywall screws to get the upper parts of the drywall properly secured to the studs but as I work my way down the bow out is too significant and the screws just pull through.
I had been thinking of trimming the bottom edge of the drywall to allow for some downward give. It wouldn't be visible due to baseboards but I'm not sure if that would create moisture issues in the long run.
Do I have any options other than tearing the drywall down and redoing it?