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Old 01-16-2010, 10:24 AM   #1
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Insul above garage


hello everybody,

My whole house has blown in insulation in the attic except above my garage.
I like to insulate above my gargage with r40 pink blanket type insulation, but I noticed there wasn't any vapour barier present, is this going to cause a problem or can I put the blanket insul right over top the drywall?

thank you,

Arjan

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Old 01-16-2010, 10:36 AM   #2
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Insul above garage


Spray Foam would be the better option in this case.

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Old 01-16-2010, 10:50 AM   #3
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Insul above garage


If the insulation has a vapor retarder (brown paper) then that shoud be facing the warm side
The down side to spray foam is difficulty in running any wires or pipes etc in the future
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Old 01-16-2010, 12:15 PM   #4
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Insul above garage


1. I doubt a vapor barrier is required in the garage as is is not living space. Probably why there was no insulation there and built to code. You could ask your local B.D.
2. SPF is better but still needs a vapor barrier paint, if required. Or sprayed to 23" thick.
3. I would use a vapor barrier primer paint to stop the moisture from outside and off the cars from getting to the drywall.

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Old 01-16-2010, 12:32 PM   #5
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Insul above garage


I was assuming there is livable space above...maybe wrong ?
Is the cold air from above the garage having an effect on the house in some way ?
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Old 01-16-2010, 01:58 PM   #6
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"I like to insulate above my gargage with r40 pink blanket" "or can I put the blanket insul right over top the drywall?"

Could have floor trusses but I hope the insulation would already be there then.......

I'd go with cellulose or batts as tall as the ceiling joists, then run more batts perpendicular to seal the joist ends.

What is the blow-in material on the house?

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Old 01-16-2010, 05:37 PM   #7
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Insul above garage


thanks everybody for responding.

my house is a bungalow style so no living space above my garage.

I was just wondering if I needed vapour barrier for moisture and if I didn't have vapour barrier and I put the insul in It would eventually distroy my drywall ceiling in the garage?.

vapor barrier primer paint sounds like a good idea, is this available at every hardware store?

I'm guessing the blow in insul in my house in the paperstyle kind, all the living area of the house has vapour barrier.


thanks agian

Arjan
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Old 01-16-2010, 05:44 PM   #8
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If there isn't living space then why insulate ?
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Old 01-16-2010, 06:08 PM   #9
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"vapor barrier primer paint sounds like a good idea, is this available at every hardware store?" ------ Yes. Look for one with a permeability rating of around 0.05, to be a vapor barrier (0.1 perms or less).

"I'm guessing the blow in insul in my house in the paperstyle kind, all the living area of the house has vapour barrier." -------- Good, not fiberglass: http://www.homeenergy.org/archive/he...92/920510.html

Be safe, Gary

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