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josh123 07-05-2006 02:08 PM

garage ceiling joists
 
hi- this is my first post to the site.
i've got a 31' X 21' garage with 2" x 6" ceiling joists spaced 48" o.c. running the 21' direction. i want to hang drywall on the ceiling. if i install two 2" x 8" joists in between the existing joists, they will be 16" o.c. if i am hanging 1/2" drywall is it alright to leave the existing 2" x 6" joists or should i replace them with 2" x 8" joists? i've read that you can't go smaller than a 2 x 8 with a span of 21'. i just need to know what the best way is to frame the ceiling for the intended weight. i appreciate the help.

Big Dave 07-05-2006 02:48 PM

Are the joist running the full width without a beam?

manhattan42 07-05-2006 05:27 PM

Quote:

Originally Posted by josh123
hi- this is my first post to the site.
i've got a 31' X 21' garage with 2" x 6" ceiling joists spaced 48" o.c. running the 21' direction. i want to hang drywall on the ceiling. if i install two 2" x 8" joists in between the existing joists, they will be 16" o.c. if i am hanging 1/2" drywall is it alright to leave the existing 2" x 6" joists or should i replace them with 2" x 8" joists? i've read that you can't go smaller than a 2 x 8 with a span of 21'. i just need to know what the best way is to frame the ceiling for the intended weight. i appreciate the help.

According to the International Residential Code 2003, you will need all 2x8s 16" on center for an unsupported span of 21' when using SPF lumber. And doing it this way will not permit you any storage to speak of in the attic on the joists.

If you want minimal storage, you will have to go to all 2x10s and frame them 12" on center when using SPF.

There are alternate ways you can achieve what you want using 2x6s, but it involves using stronger more expensive grades of lumber like Doug Fir or Hem Fir, and you may still have to go to 12" on center spacing depending on the species and grade you select.

josh123 07-06-2006 08:25 PM

garage ceiling
 
thanks for the help.
yes, i am running the 21' length without a beam (as long as that is acceptable), and there will not be any weight on the joists (no storage above) except for the weight of the 1/2" drywall.

Reyes23 07-13-2009 10:47 AM

I've got your answer
 
Use hat channel.it's a metal stud it goes perpendicular to the ceilng joist and screw it on every 12"

Gary in WA 07-13-2009 12:46 PM

The existing ceiling joists are over-spanned for drywall. They are only rafter ties, hence every 4'o.c., to keep the walls from spreading.

You need 2x10's on all, including sistering the 2x6's, as Manhattan said. http://www.mcvicker.com/resguide/page013d.htm

Or a structural beam to reduce the span. Be safe, G

Reyes23 07-14-2009 11:07 PM

Or why not drywall to the roof rafters and have a volted ceiling. I did this to my garage.


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