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Old 01-26-2013, 11:33 AM   #16
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Basement Vapour barrier issue.


buildingscience is a good resource - basement finishes with vapor barriers below grade are failing. the water isn't condensing necessarily because of leaks in the vapor barrier, the water can be coming through the concrete from the soil outside, because that's what concrete does. Making the wall airtight will just make the problem worse. new construction is adding foam on the outside of the foundation wall before backfill.
you have to get that vapor barrier out of there. the rigid foam is semi-permeable, which is recommended to be glued directly on the concrete, then framed out with fiberglass (no vapor barrier).

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