Lay some plastic material to seal the floor against room air humidity
condensation and look under it after a week once your immediate problem is
cleared up.

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"Hoosierpopi" wrote in message
...
We experience damp floors in high humidity during the hottest Summer
days. This leads me to (hope) surmise the moisture may be atmospheric
- humidity interacting with the much cooler concrete floor - rather
than ground water seepage up through the slab.