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Old 01-26-2012, 02:23 PM
John Se John Se is offline
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the dampness is coming from the temperature of the floor being below the dew point of your environment (think glass of ice water). All the materials are stabilizing to the ambient moisture level. the under slap vapor barrier is to allow heating or cooling to dry out the air and slab above the moisture barrier and keep it from returning to ambient so quickly. You could install a HVAC system on your garage to dry the air and keep the slab above the dew point. your local weather will be able to tell you the dew point.
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