How to add a vapor barrier to existing building?
I am in East Texas. I plan on converting an old woodworking room into a studio. It is 30 years old and was finished rough plywood sheathing directly over the studs. the interior was paneled in the cheapest rough particleboard the owner could find (looks like a pile or large wood ships and shreds were simply saturated with resin, then pressed into shape), but the paneling is in good shape and I don't really need to remove it. We though about just adding a vapor barrier, then covering the entire thing with a new layer of paneling or drywall. The questions are: If we add a vapor barrier, where does it go - on the outside of the building with a new layer of siding over that or on the inside with a new layer of paneling over that? And where would the insulation go? Is this kind of add-on advisable? Has anyone done this or something like this?