Concrete Slab Moisture


Old 02-18-01, 04:07 PM
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Moisture has penetrated the concrete slab (grade level),and also the plywood subfloor, so am replacing the vinyl flooring due to the staining from the moisture. My question do I prevent this from happening to the new floor I lay down? I don't have the subfloor removed yet, as the builders screwed it down into the cement pretty darn good. And before I remove the subfloor, I should ask if there would be a sealant I could use to keep the moisture from coming thru the old subfloor, or should I replace it.
Thanks for any help.
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Old 02-19-01, 08:39 PM
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First, various methods exist. From injecting liquid vinyl under the slab (outrageously expensive); chemically reacting the concrete to reduce vapor transmission, to topically applied membranes and sealers. In every instance the slab must be repaired.

If you insist on vinyl a topically applied sealer might be secondary backup in addition to chemically reacting the concrete. Another way that might work: a membrane plus a thin concrete overlay.

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