My shop is one of those glorified sheds you can buy from HD or Lowes. So the walls are framed 2x4 with exterior siding nailed on the outside. Everything is optimized for 4x8' sheets and quick construction...
Overall dimensions are 16’ x 20’, and set on piers. The floor is 5/8” treated ply, with 3/4” oak flooring nailed over some of that roofing paper.
So if I wanted to insulate and put some paneling of some sort on the inside, do I need to first put a vapor barrier somewhere?