I had recent water damage remediation done where a large portion of drywall was ripped out behind the fridge which has exposed a firewall, as well as an adjacent perpendicular wall and part of the ceiling above as well.
I'm not 100% sure but it seems as though it's 1/2" thick. Some parts it appears to be around 5/8". Should I stick with 1/2" drywall (moisture resistant as well?) for everything in this case? The unit above us that caused the damage has the same exact layout with the kitchen and fridge...
I have a length of leftover 1/2" drywall from another project and I was putting it up against the wall next to the portions that are cut-out, and it seems to fit the width. Of course, I don't have any 5/8" drywall to compare it to. I'm guessing the 5/8" would pop-out more.
The concern is if using 1/2" drywall over that firewall is not "up to code"