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Old 10-07-2016, 01:36 PM   #1
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How do I build over a concrete slab?


We enclosed with 2x6 walls and sheet rock our covered patio. We laid ceramic tile over the concrete slab. We are now raising the floor to match the existing floor thru out the house. We are removing the tile and have found there is moisture coming up thru the concrete.

1. Should we try to get as much of the thin set off the concrete prior to sealing?
2. Should we use a RedGard to seal the concrete from moisture?
3. Any particular ml of plastic to lay over the concrete?
4. Should we also treat the concrete wall footing to prevent moisture?

Thank you for your time
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Old 10-07-2016, 01:56 PM   #2
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Re: How do I build over a concrete slab?


Better check the concrete surface temperature when moisture appears to be coming up through the concrete. I'm betting it's surface condensation moisture and I'm broke until my next SS check gets here.
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Old 10-07-2016, 07:41 PM   #3
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Re: How do I build over a concrete slab?


Little late now, a vapor barrier and foam insulation should have been done under the slab before it was poured.
We have no pictures yet, no location so we have no idea what conditions your having to deal with.
Moisture needs to be dealt with out the outside, not the inside.
Gutters, drain tiles, slope away from the slab, slab at least 6" above grade, ECT.
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