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Old 10-26-2011, 03:27 PM   #1
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Insulating ceiling in garage


I am finishing my two car garage......walls are already insulated, and also added more ceiling joists to attach drywall. I don't want to turn the extra space at the top into an attic.
Can I add insulation between the ceiling joist and just attach drywall (close the ceiling off)? Mind you I don't hav any soffit vents......I wasn't sure if that area needs air circulation.

Not sure if the pictures help......any feedback is good :-)
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Old 10-26-2011, 05:40 PM   #2
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Insulating ceiling in garage


Before addressing the insulation, I'd like to ask, if those are splice plates connecting the butt ends of 2x4"(6)s?
If it is, that's not a good idea at all. Two words, ceiling collapse.
You're spanning too far with the 2x4"(6)s anyway. Even if it were one piece.
How far is the span?
Once you get the correct framing, you can just insulate the ceiling joists.
The loft area should have a vent system to keep the super heated air from driving through the insulation into the lower area.

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Old 10-27-2011, 04:46 PM   #3
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Insulating ceiling in garage


Ok thanks....taking care of the framing now. When u mean vent system, soffit vents? I don't want to use the top space at all, whole ceiling drywalled and closed off.
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Old 10-27-2011, 06:14 PM   #4
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Insulating ceiling in garage


You should still vent the space above the ceiling.
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Old 10-27-2011, 10:41 PM   #5
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Ok thanks....taking care of the framing now. When u mean vent system, soffit vents? I don't want to use the top space at all, whole ceiling drywalled and closed off.
You vent the space for a number of reasons, whether you use the space or not. One reason was the one previously mentioned. Others include that a cooler space will place less stress on builing materials like the roof and the sheathing it's nailed into.
You didn't answer the butt splice question.
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Old 10-27-2011, 11:26 PM   #6
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Insulating ceiling in garage


Here is video on the questions that Ron and others have on your garage venting, framing insulation issue.

I hope this helps.

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Old 10-28-2011, 04:38 AM   #7
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Insulating ceiling in garage


Yes they are 2 by 4's connected with plates on each side with nails. They aren't spanning the whole length of the garage, just half. There was already a wood beam splitting the garage in half, so I added 2 by 4's on each side. Where the two studs meet with the splice plate I do plan on connecting a 2 by 4 to the roof rafters. I live in the Pittsburgh area, so temperatures stay between 30-90's
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Old 10-28-2011, 07:37 AM   #8
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Yes they are 2 by 4's connected with plates on each side with nails. They aren't spanning the whole length of the garage, just half. There was already a wood beam splitting the garage in half, so I added 2 by 4's on each side. Where the two studs meet with the splice plate I do plan on connecting a 2 by 4 to the roof rafters. I live in the Pittsburgh area, so temperatures stay between 30-90's
That framing detail is a mistake. Any load put on the rafters above will not hold up. You may not put anything up there, but future owners might. Even if you don't, the load of the sheetrock and insulation could cause it to fail.
This is a classic homeowner mistake, doing things on the cheap to save money. It will bite you on the ass in the long run.
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Old 10-28-2011, 10:12 AM   #9
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Insulating ceiling in garage


I understand.....what would you suggest on framing?
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Old 10-28-2011, 02:39 PM   #10
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Insulating ceiling in garage


Insulate the rafters.


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Old 10-28-2011, 11:46 PM   #11
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Insulating ceiling in garage


Your location may not need ventilation: http://www.fpl.fs.fed.us/documnts/pdf2002/rose02a.pdf

On the other hand, attic ventilation and access is required per code if this will be “living space”: http://publicecodes.citation.com/ico...9_8_sec006.htm
Read the other ones, clicking on “next section” at that site.

Access is required: http://publicecodes.citation.com/ico...9_8_sec007.htm

Ceiling joist spans: http://publicecodes.citation.com/ico...002_par023.htm

What is the end purpose of the garage finishing?

Gary
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Old 10-29-2011, 12:01 AM   #12
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Insulating ceiling in garage


On those ceiling joint splices....I believe the 'typical' standard is 4' to either side of the splice....hence, you would need to sister up an 8' length of lumber across each splice.

What is the span? Over 18'? Confirm those are 2x4's? If so.....then I'm thinking you want 2x6's at a min...if not 2x8's....even for ceiling joists.....like Ron said....your existing setup is not going to hold any weight....

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