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Where to Put the Vapor Retarder in this Finished Garage

Genassy | Posted in General Questions on

I’m finishing an attached garage that has bedrooms above and living space on two sides. That leaves only one exterior wall.

Everything is getting new insulation as the previous installation was damaged.

The garage isn’t always going to be heated in the winter time, maybe 3 days a week for exercise.

Before the damage to insulation was removed, vapor barrier was on the warm house side. Because the garage isn’t always heated I will have to insulate these walls, which side should vapor barrier go on?

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  1. Expert Member
    Akos | | #1

    There is no benefit to a vapor barrier on any of the outside garage walls. I would leave it out.

    You only want a VB between the house and garage, which should always be on the warm side if in heating dominated climate (ie behind drywall at the house side and bellow the subfloor for the bonus room).

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