I'm currently tearing out the sheetrock and everything in my attached garage to do general repairs to other things. I quickly found that there wasn't a single bit of insulation (which explains a lot on my heat bills in the winter I'm sure) so I'm going to do that too before I re-drywall everything.

My plan is faced r-19 in the walls (with the face towards the interior) and non-faced r-30 for the ceiling between the floor joists since there's bedrooms above it.

Question is, am I assuming the correct types (R19/R30) for this project, and do I have any airflow concerns (venting) I should address from doing this?

I live in the Midwest US and we can get some pretty cold winters, the garage doors are insulated types and the place is sealed pretty decent. There's another rear entry door and a door into the home, both have decent sealing on them and I just replaced the exterior door last year, it will be used daily once completed so I can't assume any "stail air" or excess moisture would get bottled up in there for too long at a time.

Any insight?

  • What size studs and joists do you have?
    – rjbergen
    Commented Oct 16, 2014 at 17:20
  • Cellulose does a much better job IMPE (and I've used both.)
    – Ecnerwal
    Commented Oct 16, 2014 at 17:28
  • @rjbergen The floor joists (ceiling) are 2x12's standard 16" spacing, the walls are 2x4 standard spacing
    – Chris W.
    Commented Oct 16, 2014 at 17:38
  • @Ecnerwal I'd agree, but I dont have the equipment to spray it, and I thought it was a bit more expensive when you buy those sheets, we don't plan on staying in the house forever so cutting costs where I can also. I'll have to go research a little to see if there's any cost benefit etc.
    – Chris W.
    Commented Oct 16, 2014 at 17:40
  • To what extent is the garage heated or cooled? Are there exposed water pipes in the garage or in the garage walls?
    – wallyk
    Commented Oct 16, 2014 at 17:43

1 Answer 1


Cellulose insulation would be a great choice if you have living quarters above. The cellulose insulation is more dense and will help control air movement and drafts. Cellulose Insulation

  • I went ahead and marked this as the correct answer as that's what I should have done, however I've already done it with fiberglass because I was able to get it very cheap for this project.
    – Chris W.
    Commented Dec 11, 2014 at 17:28

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