Someone has probably been watching too much Holmes on Homes. This came up on one of his shows as a "code issue" and people extrapolate it out. You need to have a vapour barrier between your garage and your home (to keep carbon monoxide and other gasses out of the house) but your builder would have already taken care of that. The only thing you want to make sure of, now that you have insulated your garage, is that you have adequate ridge vents in your garage's attic.
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