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Old 04-18-2013, 11:15 PM   #16
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If you use a vapor retarder/barrier sheet goods on the concrete, it could condense moisture from the basement air and mold the wood framing. If you don't put anything on the concrete wall, it will condense basement moisture. The best retarder is rigid foamboard, as said already, it won't mind being wet next to the concrete, long as it is air-tight from basement air. You can add an insulated (R-13) wood frame wall in front without worry of condensation if the foam is thick enough. At 68*F room air; 1" XPS and R-13 cavity= safe at/below 29%Relative Humidity above grade and 3' below grade (your frost depth). 1-1/2" XPS = 34%RH 2"XPS = 38%RH



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Old 04-19-2013, 11:10 AM   #17
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Yep Styrofoam glued to contact and sealed top and bottom. Then frame in front run your electrical and insulate.

Listen to Gary, answer his questions, he is good at this stuff.


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