I've seen this in two instances. One where there was 2" of sand below slab and the vapor barrier and the sand never truly dried out. The other had 2" of sand and the gutter drains were being fed into the slab w/o a drain.
99% RH in concrete slab
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RE: 99% RH in concrete slab - eaadams - 08-22-2010, 02:45 PM
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