Foam sheathing insulation on basement block walls
Building a new home in Syracuse NY. We will have two bedrooms in the finished basement (not walk out but large egress windows). I want to use foam sheathing on the concrete block walls – primarily as a vapor retarder but also for it’s insulating value. I have read differeing opinions on the ideal permeability rating for foam in this situation. BSC says to keep it permeable but I have read elsewhere (here maybe) to use impermeabile. I have my eye on 1″ XPS because Lowes has it in stock.
What do people recommend? Thanks
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