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Old 09-15-2020, 09:17 AM   #1
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Vapor barrier in garage?


Hi all,
I'm not a newbie but I haven't been on here in years, how are you all doing? Hey so, my wife and I have moved to Charlotte, NC area, and they only drywalled the garage walls so far, like 1/2 way to the garage door, so I am doing the rest. Question is, do I put vapor barrier up? If so which side, facing the inside or the outside of the cavities? I am just looking to keep the garage warm in the winter months so I can do things in the garage...

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Old 09-17-2020, 07:33 AM   #2
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Re: Vapor barrier in garage?


how warm do you want to keep this garage ? always heated or just when you are out there ? going to park a daily driven car in there ?
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Old 09-17-2020, 08:02 AM   #3
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Re: Vapor barrier in garage?


Quote:
Originally Posted by Fix'n it View Post
how warm do you want to keep this garage ? always heated or just when you are out there ? going to park a daily driven car in there ?
Warm just when I'm in there, prolly not a daily but a winter project, I have heaters and such but I'd like it to warm up quickly in there...

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Old 09-18-2020, 10:34 AM   #4
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Re: Vapor barrier in garage?


just put up drywall and be done. and do your best to have the heat blow right where you will be working.

what kind of heater/s ?
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Old 09-18-2020, 12:04 PM   #5
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Re: Vapor barrier in garage?


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just put up drywall and be done. and do your best to have the heat blow right where you will be working.

what kind of heater/s ?
Just a small space heater and one that goes on top of a propane tank...
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Old 09-18-2020, 12:24 PM   #6
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Re: Vapor barrier in garage?


I was taught vapor barrier always goes on the warm in winter side of the insulation. The idea is that water vapor moving from the building does not get to the insulation where it could condense and freeze and thereby prevent insulation/transfer of heat as solids (like ice) and liquids do conduct thermal energy. Also, prevents water from condensing and causing rot/mildew in walls.
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Old 09-18-2020, 12:31 PM   #7
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Re: Vapor barrier in garage?


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Just a small space heater and one that goes on top of a propane tank...
what are the average cold temps in the winter ?
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Old 09-18-2020, 12:48 PM   #8
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Re: Vapor barrier in garage?


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what are the average cold temps in the winter ?
It will get below freezing in January at night, mid-30s at night the other winter months, mid 50s during the day...
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Old 09-18-2020, 01:30 PM   #9
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Re: Vapor barrier in garage?


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It will get below freezing in January at night, mid-30s at night the other winter months, mid 50s during the day...
thats nothing. your propane heater may work well enough for you, i had one. put a small fan above and behind it to blow the heat at you.
heck, its 59 here right now, i could work in the garge in just a t-shirt.

average 20deg days here jan/feb, i had to step up to a small propane torpedo heater and it worked good. but i still had to dress well.
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Old 09-18-2020, 03:10 PM   #10
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Re: Vapor barrier in garage?


Agreed with VB on the warm side.

I would not skip the VB - with drywall in particular - in the pacific northwest. Just asking for mold. Not sure how your region stacks up in this respect.

EDIT: Propane space heating creates a lot of humidity also.
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Old 09-24-2020, 08:38 PM   #11
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Re: Vapor barrier in garage?


How large is your garage?
If you want to use it quite a bit in the cold months consider a permanently mounted heater.
As mentioned earlier, any portable heater, except electric will add humidity since it is not vented. Wall mount heaters can be vented through the wall and do a good job in a properly insulated space. The winters in my area are mild with some occasional cold spells in January. It is not uncommon for it to get to 3 deg. at night then 40 deg. the next day.
I have gone into my workshop and turned on the heat at 8AM on a 30 deg. day to shut it off by 10 and open the doors because the temp outside has risen 30 deg.
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