stud and insulate garage block walls


I'm not sure if I should put plastic vapor seal against the block wall. It will be a 2x4 wall about an inch away from the block wall. The insulation will have the standard paper vapor seal/barrier. I know I've read about problems with 2 vapor seals trapping moisture between the two and am wondering if this is one of those situations. The garage will be heated and cooled at times.
I'm also thinking of putting up the sheathing type 4x8 sheets of insulation and putting the 2x4 wall and fiberglass insulation right against that. Electrical wiring is of no or little concern here, I got that part covered.
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wrote:

Use the foam insulation board against the block wall, then stud and insulate with Roxul Rock Wool insulation with no vapour barrier. You need to let that wall breath, and you want insulation that is not harmed by moisture and that does not support mold growth. That kinda rules out fiberglass - particularly with paper backed vapour barrier.
That rockwool batting is WONDERFUL stuff.
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