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Subject Author Date
Drywall sag Eigenvector 12-25-2006
|--> Re: Drywall sag tbasc@bellsouth...12-25-2006
---> Re: Drywall sag Edwin Pawlowski12-25-2006
|--> Re: Drywall sag Joseph Meehan12-25-2006
---> Re: Drywall sag Father Haskell12-25-2006
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Posted by Eigenvector on December 25, 2006, 12:51 am


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.



Posted by tbasc@bellsouth.net on December 25, 2006, 1:06 am



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.
>
> 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.

USG recommends 5/8" gyp bd be supported by joists 16" O.C. if the gyp
bd sheets are parallel to the joists and by joists 24" O.C. if the
sheets are perpendicular to the joists.

TB


Posted by BobK207 on December 25, 2006, 4:40 am



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.
>
> 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

Ceiling joists at 48" are way too far apart, even for 5/8" ....if you
want the ceiling to look flat

IMO even 5/8 is a stretch at 24" .....I would use 1/2 with joists at 16


cheers
Bob

PS the drywall / plywood combo will cut very easily with a jig saw


Posted by on December 25, 2006, 7:48 am



BobK207 wrote:
> 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.
> >
> > 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
>
> Ceiling joists at 48" are way too far apart, even for 5/8" ....if you
> want the ceiling to look flat
>
> IMO even 5/8 is a stretch at 24" .....I would use 1/2 with joists at 16
>
>
> cheers
> Bob
>
> PS the drywall / plywood combo will cut very easily with a jig saw



I'd be curious to know where any building code allows 48" as routine
ceiling joist spacing, whether in a basement or anywhere else. I'm
betting you don't have a building permit.


Posted by Eigenvector on December 25, 2006, 12:54 pm



>
> BobK207 wrote:
>> 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.
>> >
>> > 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
>>
>> Ceiling joists at 48" are way too far apart, even for 5/8" ....if you
>> want the ceiling to look flat
>>
>> IMO even 5/8 is a stretch at 24" .....I would use 1/2 with joists at 16
>>
>>
>> cheers
>> Bob
>>
>> PS the drywall / plywood combo will cut very easily with a jig saw
>
>
>
> I'd be curious to know where any building code allows 48" as routine
> ceiling joist spacing, whether in a basement or anywhere else. I'm
> betting you don't have a building permit.
>
Not required, I'm repairing existing work - I asked first. But thanks for
playing.

As for 48" separation, I've seen a lot of houses with this kind of joist
separation. Perhaps its peculiar to my house construction, pier and post
foundation, but certainly not unique.



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