I used fiberglass batts between the studs and ran half inch Tough-R over the studs. It is foil faced. All seams and capped nails were sealed with foil tape. Then I drywalled over the Tough-R. The windows needed a little extra trimming but no moisture barrier was needed. If you are just using polystyrene between the studs, you will need a vapor barrier since the studs will allow moisture movement.
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Alan
Tomorrow is often the busiest day of the week.
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