Under house garage insulation


Old 12-12-09, 12:50 PM
Thread Starter
Join Date: Dec 2009
Location: connecticut
Posts: 1
Under house garage insulation

I want to insulate my garage ceiling which is under the house.
Can I use faced insulation (facing house floor) or do I have to use unfaced batts, if so what about condensation problems.
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Old 12-12-09, 02:26 PM
Join Date: Dec 2009
Location: nh
Posts: 2
you can use faced just as lone as you keep the faced side to the heat side. The thing is if you sheet rock the ceiling you would want the vapor barrier between the heated side and the insulation. if you are not sheet rocking the ceiling, batts would let out the condensation.
Old 12-12-09, 03:51 PM
Join Date: Oct 2008
Location: New England
Posts: 9,990
Hi Peter and welcome to the forum,
Sheetrocking the garage seiling would be considered a must, check local codes. Vb to the warm side as jm stated. It doesn't have to be stapled or continous, as long as you air seal the floor above. Use a fire rated can foam or caulk and seal all holes or potential leaks. Anything the contractors drilled a hole in, you seal, plus all seams and gaps.

The other important part is to use a 100% fill on the insulation. The heat in the room above moves up away from the floor. That makes it hard to keep the floor warm. Max insulation will help.


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