I have a conundrum. I recently inherited an older home that a family member was in the process of remodeling located in inland south Georgia. The exterior siding was replaced with 29 ga. painted galvalume run vertically, on top of tar paper that was not taped at the seams, on top of 3/8 in. thick styrofoam 4X8 panels. The fiberglass batts in the 2X4 wall studs were removed. The Sheetrock ceiling panels were removed, along with the rockwool attic insulation laying on top of the ceiling panels. Pine T&G boards were purchased with the intention of using them for the walls and ceiling. I know that the exterior building envelope is not correct, but in the interest of not throwing good money after bad, what is my best course of action here? The wall studs and ceiling joists are in great shape, and the metal siding is brand new. Should I have closed or open cell insulation installed between the wall studs, and in the attic, and call it a day? Or put fiberglass batts back into the walls? I would like to install the pine T&G for walls and ceiling since they were already purchased. From a moisture management viewpoint, would spray foam be better than installing fiberglass batts? I would rather the future owner have a less efficient house than one with mold problems.