insulating unattached garage

rodcoJanuary 10, 2011

I have a 24x24 concrete block garage thant i am creating a workshop in. ceiling joists are 2x8's 16OC. There is a floor (nailed down plywood) on top of the joists.

I am installing a woodstove to heat the garage and want to know the best and cheapest way to insulate the ceiling.

My idea was to install the 1/2" rigid insulation sheets on the bottom of the joists and blow cellulose into the cavities.

How does fiberglass bats compare in cost to the blown in? Which is a better insulator?



Pittsburgh, PA

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Blown in tends to have fewer gaps in the insulation coverage.

    Bookmark   January 10, 2011 at 4:14PM
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I'd be worried about the insulation panels supporting the weight of the blown in insulation. You'll probably want a drywall ceiling. It will also allow you the flexibility to install any power outlets or lighting fixtures. You'll definitely want to do that before any blown in. Having the plywood on top of the joists will make installation pretty difficult.

In your case, I would just go with fiberglass batts. Get the kraft faced stuff and staple them to the joists. You could add an additional layer of rigid insulation if you wanted, but you would still have the previously mentioned issue with lights or outlets. This won't be as airtight as blown in, but it would be a lot easier.

    Bookmark   January 16, 2011 at 1:26PM
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