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Old 11-01-2011, 06:06 PM   #1
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Insulation between garage and bathroom above


We are remodeling the master bath which happens to be above the garage. Currently there is R-22 insulation between the two. I want to add some more to that, but am unsure of the easiest route to get it there. Should I pull up the subfloor, add batting and then new subfloor? OR should I make holes in garage ceiling and blow in some more insulation? Or make holes in subfloor to blow in more? How much more insulation can I add? The joists are engineered I beams that are 12 inches high and 16 inches apart.


thanks in advance
Mindy in Richardson, TX

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Old 11-01-2011, 06:26 PM   #2
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Insulation between garage and bathroom above


I'd pull the ceiling down and spray a closed cell foam in there.

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Old 11-01-2011, 06:29 PM   #3
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Insulation between garage and bathroom above


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I'd pull the ceiling down and spray a closed cell foam in there.

I hear that can be fairly expensive, and I am not certain it will fit in the budget at this time. But maybe I am wrong on the cost.

Mindy
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Old 11-01-2011, 07:21 PM   #4
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Insulation between garage and bathroom above


Anyone know what a double garage approximately costs to foam insulate in the Dallas TX area?

Mindy

Last edited by zmindyk; 11-01-2011 at 08:39 PM.
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Old 11-01-2011, 09:30 PM   #5
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Insulation between garage and bathroom above


Assuming that the R22 insulation is in batt form and that there is a vapor barrier under the subfloor, I would suggest that you would blow cellulose insulation into the cavity that is between the insulation and the vapor barrier.
The cellulose can be blown into the cavities by drilling 1" holes through the subfloor.
After the joist cavities are filled, close the drilled holes using expanding foam insulation.
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Old 11-01-2011, 10:12 PM   #6
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Insulation between garage and bathroom above


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Originally Posted by Ron6519 View Post
I'd pull the ceiling down and spray a closed cell foam in there.
The only way to go! We used this solution a couple of years ago in exactly the same situation. The change in temperature of the bathroom is huge! You should at least check the price, it's probably not as bad as you're thinking.
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Old 11-01-2011, 10:35 PM   #7
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Insulation between garage and bathroom above


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Assuming that the R22 insulation is in batt form and that there is a vapor barrier under the subfloor, I would suggest that you would blow cellulose insulation into the cavity that is between the insulation and the vapor barrier.
The cellulose can be blown into the cavities by drilling 1" holes through the subfloor.
After the joist cavities are filled, close the drilled holes using expanding foam insulation.
Yes, the current insulation is in batt form with the attached vapor barrier to the underside of the upstairs floor. So blowing from the top would put insulation, vapor barrier, insulation.

Mindy
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Old 11-01-2011, 10:36 PM   #8
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Insulation between garage and bathroom above


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The only way to go! We used this solution a couple of years ago in exactly the same situation. The change in temperature of the bathroom is huge! You should at least check the price, it's probably not as bad as you're thinking.

Do you know how many inches of foam you used? Just curious.

Mindy
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Old 11-01-2011, 11:27 PM   #9
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Insulation between garage and bathroom above


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Do you know how many inches of foam you used? Just curious.

Mindy
The foam is rated @ R5/inch!
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Old 11-01-2011, 11:29 PM   #10
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Insulation between garage and bathroom above


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Yes, the current insulation is in batt form with the attached vapor barrier to the underside of the upstairs floor. So blowing from the top would put insulation, vapor barrier, insulation.

Mindy
The cellulose fills the void between the existing insulation and the vapor barrier that is immediately under the sub floor.
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Old 11-02-2011, 11:42 AM   #11
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Insulation between garage and bathroom above


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Do you know how many inches of foam you used? Just curious.

Mindy
We put 6 inches of closed cell foam (about R-40). The big advantage is not only does it provide insulation but are also completely prevents air infiltration.
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Old 11-04-2011, 12:36 AM   #12
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Insulation between garage and bathroom above


You would still get a temperature difference from the cold garage air (thermal bridging), similar to a crawl space. You would also need a foam board under the new 5/8" fire-rated drywall. I would add more fasteners to the drywall, and possibly wood strapping, for the added weight of 12" of cellulose.
http://www.buildingscience.com/docum...n-crawlspaces/

http://gypsum.org/pdf/GA-216-2010.html

Gary

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