I'm getting a few more nice tools and I want to insulate and add a/c & heat to my shop. It's a pole barn style shop with a concrete floor. The entire building is 30x40 but my shop is the back half so 20x30.
I'm going to use an 18k btu mini-split unit to provide the comfort. My question is on the insulation. I know I'll be putting sheetrock up and R30 batts inthe ceiling. The question is the walls.
I can either insulate inside the existing walls (up against the metal) or I can stud up a 2x4 wall just inside the outside wall (screwing it to the concrete at the bottom and nailing it to the trusses above). I would be giving up a tiny bit of space but the wall could take more than a R13 batt and would be a regular stud wall which is easier to sheetrock.
Ideas?