I think you’ll need to put the vapor barrier on the warm side of the wall to prevent the warm moist bathroom air from condensing on the foundation. Hopefully the foundation is insulated so that the temp. of the vapor barrier itself isn’t allowed to drop to the dew point. If so, water vapor will condense on the vapor barrier and cause problems.
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The idea of the VB is to stop misture from getting into the wall and condensing there - trapped where it will cause rot.
I don't think you need to worry too much about the concrete wall rotting. I would mud straight to it.
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The more I thought about it maybe I posted the question in haste. However, I will be building a stud wall along the foundation side. It is exremely rough. Over the studs goes concrete board and then the owner wants a shower base, with panels by SwanStone on the walls. There is a window cast into the foundation wall about 10" to 12" in height. It will remain for ventilation after I put obscure glass into it. So any VB probably still belongs on the inside (heated) area. I was thinking the concrete, combined with being underground (cold) might change where the VB goes. Now that I pondered it a tad longer (and got imput) I think the standard location (inside) will be fine. I was thinking along the lines of mold, mildew, etc. which seems to be all the rage these days. Thanx, Tyr
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