Do I need a vapor barrier under drywall in my unfinished garage?

pasta_paul

I’ve got an attached unfinished garage and laundry room. I’d like to put something on the walls to attach shelves to sort out my mess of stuff and to convert the space into a more usable workshop. This is an older house (1950) and has a sort of weird construction. Some of the exterior walls are brick over a tar paper over studs (exposed on the inside) - no sheathing as far as I can tell. Other walls are partial brick (3 feet up) with the top...

Originally asked by Gary P on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

If you are NOT going to condition the space, the vapor barrier will simply be a waste of time, money and effort. You're going to have the same temperature and humidity inside and outside, so you're not going to have any vapor attempting to move from one side to the other, nor condensation on the cold side because there won't be a cold side.

Full answer by FreeMan: https://diy.stackexchange.com/a/283318 (CC BY-SA 4.0).

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