Interior vapour barrier with exterior XPS
I am in the initial stages of house design.
I am thinking of a double 2X4 wall construction with 2″: of XPS on the outside to minimize thermal bridging.
My concern here is that building code here in Ontario requires a vapour barrier on the warm side wall
I suspect that the combination of XPS on the outside and 6 ml plastic on the inside will cause any water that might get into the wall cavity to stay there and not have any where to go .
Question : How do I get my wall to dissipate water in this design ?
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