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Posted by Father Haskell on December 25, 2006, 2:22 pm
Eigenvector wrote:
> 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.
Time to buy a chopsaw.
Cut each joist 1/8 - 1/4" long and test fit. Pare the ends until it
fits.
> 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.
Cheap circular saw or jigsaw with 2 x 4 guide fence.
Two more options: Hang 2 x 4s across the joists, 24" apart. Possible
downside is this will lower your ceiling 2". That, or a cathedral
ceiling.
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