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Originally Posted by AbHDToyHauler
Ok but in Canada the "house wrap (read Tyvek) must breath and therefore let water vapour out but not let "Water" in (read Rain). The actual vapour barrier goes on the studs under the drywall (this is for cold climates of course so that may not be the way the Southern US does it??? I'm intrigued now. My understanding is that the vapor barrier is to be as far from the cold wall as possible too. Try typing in house wrap vs vapor barrier (we use vapour in Canada LOL) .
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What you do in Canada is exactly what the residential building code requires in MN also. So no worries, you aren’t losing it.
Siding, house wrap, sheathing, insulation, 2x6 studs, 4 mil poly, sheetrock <— from the outside to the inside of an exterior wall (except of course the studs and insulation are in the same “layer”). Only way to not have the poly on the interior of the studs is to use closed cell spray foam insulation instead of batt insulation, the spray foam acts as the vapor barrier as well as insulation.