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Old 10-23-2009, 03:28 PM   #1
 
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32" oc ceiling joist


I am trying to finish off the ceiling in my garage. The 2x6 joists are 32"oc.
I am going to use 5/8 rock. I was going to use a framing nailer and nail 2x2 24"o.c. My Stepdad insists that the 2x2 will pull off eventully due to the weight of the rock and insulation. He thinks that I should nail 2x4 16oc perpendicular to the 2x6's. I have 3 1/2" sheets of white foam that I was going to cut down to size to fit into the ceiling. Should I use that insulation in the walls instead? Thank you for any advice.
Jeff
Plymouth mn
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Old 10-23-2009, 03:40 PM   #2
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2x4 24"o.c. will be fine since you are using 5/8 rock. I wouldn't use 2x2s. Unless you are tring to save some money, I would use the styrofoam in your walls and get some r-19 (5 1/2" thick) for your ceiling.
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Old 10-23-2009, 05:03 PM   #3
 
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I was going to nail the 2x2 across the entire length of the ceiling across the bottom of the joist. My stepdad Thinks that I should cut 2x4s and nail them in between the joist. It seems like a heck of a lot more work to toenail them in Thanks
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Old 10-23-2009, 05:08 PM   #4
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2x2, 2x3, and 2x4 aren't much different in price, perhaps $.25/ea from 2x2 to 2x3 last I bought some. Trying to align drywall seams on wider boards will make your life much easier. 32" O.C. is something I've never seen. Depending on the span of them you may need to add some joists, particularly if you want to use the attic for storage of any kind. 2x4 strapping will also help to make the plane of the ceiling more even.
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Old 10-23-2009, 07:28 PM   #5
 
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so I should use 2x4 instead of 2x2 for straping? Do you think that I should nail 2x inbetween the joist too? or would strapping be enough? Thank you
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Old 10-23-2009, 07:32 PM   #6
 
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what is the Rvalue of 3 1/2 thick of the white foam board? Thanks again
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Old 10-23-2009, 11:11 PM   #7
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I'd be more concerned about the inability of 2x6 ceiling joists spaced 32"oc to span very far at all with the weight of the rock. I'd think really hard about adding another 2x6 in between your existing joists.
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Old 10-24-2009, 12:15 AM   #8
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Ditto... I had typed some rambling commentary on why you would want to add some joists, yet having no idea what dimension the garage is and having read a lot of folks describing the construction of their garages, I deleted it for courtesy sake.


Conventionally framed ceilings have a maximum spacing and span for a given size of joist. 32" isn't a typical "ceiling joist" spacing in conventional framing. Based on the width of your garage, or more specifically the span of the joists you may need to add some more joists to put drywall up at all.

http://www.awc.org/calculators/span/...rcalcstyle.asp
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Old 10-26-2009, 12:27 PM   #9
 
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Thank you for your help. The garage is 24x24. the 2x6 runs from front to back. There are 2x's in a v type pattern in the middle connecting to a 2x6 along the top of the joists in the middle of the garage. I could nail more support from the deck down to the joist if that would help. My house was built in 76. If there is any other info that would help. Thanks for all your help!!
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Old 10-26-2009, 11:53 PM   #10
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If, as you've described, the joists are then 24' 2x6's they're installed double what they're rated for as ceiling joists at 16" o.c.. There are solutions if that's so, but you've got a pretty lengthy clear span to work with. I think I'd probably stick 2x12x24 @ 24" o.c. in there and use the 2x6 for something else. 2x12's that long aren't cheap though, it might be less expensive to get some wood I-joists. You could also install a beam from side to side at the center of the garage and carry the joists on hangers. Your joists you have now would be about 1/2 what you would need to have them 16" o.c. hanging on the beam. I'm not completely clear on what you mean by hanging support off the deck. If you mean from the rafters down to the ceiling, from what you've said your joist aren't parallel to the rafters?

No matter what you do, don't hang drywall on 2x6x24' joists.
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Old 10-27-2009, 06:21 AM   #11
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Quote:
Originally Posted by J.Hemenway View Post
There are 2x's in a v type pattern in the middle connecting to a 2x6 along the top of the joists in the middle of the garage.
It sounds like you might have engineered trusses rather than joists. If that's the case, they should be much stronger than a stick built roof with 2x6 joists. Might need to check with an engineer (or maybe even a roof truss Co) to see if it will support drywall @ 32" OC.
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Old 10-27-2009, 05:33 PM   #12
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Pics help...
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Old 10-27-2009, 06:54 PM   #13
 
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Thanks for your help. I will get pics in the next couple days.
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