In Minnesota, I had a small shop area out in the woods. I laid
treated 2x4's flat, 12"oc. Plastic on top of that and then the wood sheeting.
I did the 'back room' on the garage here about the same. It's on a
concrete slab (no moisture barrier that I'm aware of). Plastic
sheeting, then regular 2x4's laid flat 12"oc. Sheet insulation
between the 2x4's and 3/4 flooring on top of that. It's worked well
over the last few years.
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