If I have ceiling joists that are 48" apart, will 5/8" drywall sag if mounted on it?
I'm not seeing too much information about that around, even though I'm pretty sure 48" is pretty standard framing for a basement.
I made the mistake of putting 1/2" up the first time - bad bad mistake that cost me dearly. But 5/8" isn't that much more. The idea of installing
2x4's between the studs isn't my idea of a fun time, especially since it will introduce more margins for error unless I'm a demon for measurements.I am also considering the idea of using plywood backing over the joists as a way to give the drywall a larger surface to attach to - even if it isn't structural it will still remove any sagging. But that option has the detraction of reducing my headroom by 1/4" or more. I know it doesn't sound like a lot, but it all adds up - not to mention it will make adding lighting fixtures a huge pain in the ass since you can't cut plywood with a drywall saw.