I installed a new window in a bedroom, and have a question on how it was insulated. Currently, the walls are 2x3's. There is R13 between the studs, with vapor barrier. then there is 3/8 inch plywood, followed by a layer of tar paper. i then put a layer of plastic on the wall (maybe 5 feet wide(the area that needed to be reworked)), followed by 1 inch foamular, then the wood siding on top of that.
The question I have is, should that sheet of plastic be sandwiched between the tar paper and foam? I would have put tyvek in it's place, but that is very expensive for the very small amount I need.
I guess I am wondering, will this sheet of plastic cause the wall to rot over time due to condensation trapped between the plastic on the outside and the vapor barrier on the inside?? I live in WI, and the climate changes drastically.
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