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Posted by Glenn on August 29, 2006, 5:27 pm
Don't be talked out of a vapor barrier. I finished my attached
somewhat oversized two car garage with sheetrock after I insulated
the ceiling and walls several years ago then I put in a gas
heater, vented of course, to keep things from freezing with it
staying around 40 in the winter. Just last month, I put in a
washer dryer combo so I don't have to walk down to the basement so
often. So as to not have to vent it where I didn't want to, I got
an electric dryer and it vents into the garage. It gets rather
humid now and I'm glad I did it right years ago.
You might get slow yourself going down to the basement and do the
same thing in years down the road. Cover your butt now. :)
> beerguzzler50@yahoo.com wrote:
>> I am about to drywall and insulate my detached garage
>> ceiling. Instead of stapling the kraft faced pink
>> fiberglass insulation to the ceiling joists, I was
>> thinking I could save a step by sheetrocking the ceiling
>> first and then dropping in the insulation (paper side
>> down) and save myself the stapling. Will I have a vapor
>> barrier issue, or is this a bad Idea?
>
> This is a bit off topic to your question, but since you
> mentioned vapor barriers, I figured it an appropriate
> thread to inject a comment.
>
> Is the garage going to be a "conditioned space" and have
> moisture sources? Will you be using the attic for storage
> or will it be totally isolated from the downstairs? Do
> you live in a hot moist environment or a cooler one?
>
> A vapor barrier in a garage doesn't make any sense to me.
> Typically, a vapor barrier is to prevent moist air from
> getting into a cold space, condensing on the cold
> surfaces, and leading to moisture issues.
>
> In a garage, there's not much of an air envelope so the
> inside air would appear to be no different than outside.
> Perhaps with the doors all closed, the garage will
> experience less temperature and humidity swings than the
> outside, but overall, it's very different from a house
> that is filled with moisture sources that will drive
> humidity through the walls/ceiling.
>
> That said, I've not seen many garages that have air
> sealing between the attic space and the main garage.
> Hence a vapor barrier on your ceiling will do nothing
> since the humidity throughout the garage would be
> relatively uniform.
>
> If I were in your shoes (and I sort of am because I'm
> just about to build a detached garage), and I wanted to
> use the attic space for storage (which I do), I would put
> a perforated radiant barrier directly under the roof deck
> then insulate the upper cavities so that the outer shell
> of the garage is insulated.
> It sounds like you're further ahead on the project
> however. In that situation, I'd still use a radiant
> barrier under the roof, then blow cellulose into the
> attic space and avoid the pink stuff altogether.
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