I have a 100yr old wood frame house in Louisiana that recently flooded, so I'm replacing the drywall. The walls are uninsulated, and are from the outside in: vinyl siding, clapboard siding, post/beam, tongue and groove planks, drywall. Would it make sense to install plastic sheeting as a vapor barrier before hanging the new drywall to help with air infiltration? I'm convinced its not worth the effort to fill these cavities with foam or rip out the tongue and groove simply to install insulation in the walls. I know in the south an interior vapor barrier can cause condensation in the wall cavity, but with no insulation there to get wet, is there any reason not to do this?