We want to finish the interior walls of our garage (2 stories). There is wood siding on the exterior but the interior is just studs.
Question: what kind of vapor barrier do we need to install? I know new construction uses Tyvek under the siding, but is there some way to add Tyvek or other vapor barrier to the inside of the walls? We can't remove the siding, so how can we install vapor barrier before insulating and adding drywall?