I'm starting to finish my basement this month and I want to be careful how I proceed. I've been reading through the various arguments posted here relating to vapor control and I've been visiting buildingscience.com's website for about 6 years now and their vapor control advice makes sense. I certainly does not make sense to place a vapor barrier on the warm, moist interior side of a basement wall and trap moisture inside the wall assembly which can enter through the concrete. That much is clear. Anyone thinks this is ok only needs to read the first posting in this thread to see what can happen.
However, it also seems to make sense that I could avoid the process of gluing foam board insulation to my concrete wall (approx 35, 4x8 sheets in my case), by applying 6ml plastic vapor barrier directly to the concrete wall (a fraction of the time and cost), and build the wall assembly to the inside of the plastic with low-cost batt insulation. Further, since my region is considered "cold climate", I am considering building a 2x4 studed wall with 16" centers about 3 inches away from the concrete wall. I could then install 20" R11 batt insulation behind every second wall cavity, overlapping behind each stud. I would then place another 15", batt between the studs, alternating R11 & R20. This would have a similar effect to gluing the foam board behind the wall assembly, but would take far less time & cost to install.
Does this make sense to anyone? Has anyone ever tried this approach? I'm a "layman" when it comes to construction but if you agree with the principles as set out in www.buildingscience.com, you would also agree that this approach might also work as well.
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