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Old 02-16-2012, 12:26 PM   #1
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Damp concrete floor


My house, which is 2 years old, has a full basement that is poured concrete. I have been finishing the basement and I am now ready to do flooring. I had a flooring company come out and look and the floor and they tested it for moisture. The readings came back that the concrete was around 16% moisture which was very high. The floor and basement are both very dry. My house sits on the peak of a small hill and the sump pit hasn't ever had a drop of water in it and we have had several wet seasons. Several moths ago I had a radon system installed and when we drilled through the basement floor there was zero moisture under the slab. There isn't a vapor barrier under the slab though. The floor had a sealer applied to it after the pour. I have a dehumidifer running in the basement and it does not run very often and maintains a humidity of 40% very easily. I am very confused as to why my slab is so wet. Does anyone have any ideas as to why or how I can fix it? Thanks1

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Old 02-16-2012, 12:37 PM   #2
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Damp concrete floor


Sounds like your doing all the right things.
Around here we have to have a vaper barrier and foam under the slab, to late now for you though.
May still be able to use an engineered flooring is you add a cork vaper barrier.

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Old 02-16-2012, 12:41 PM   #3
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Thanks for the reply. Won't I have to worry about mold growing on the cork with the moisture coming out of my floor?
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Old 02-16-2012, 02:31 PM   #4
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it is why a vapor barrier is used due to thermal transfer causing moisture if i remember correctly same reason you use vapor barrier on insulated exterior walls i would look into "research" using a concrete sealing paint "like drylock" as a solution
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Old 02-16-2012, 05:27 PM   #5
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Damp concrete floor


All ground gives off moisture vapor I don't care if your in the dessert or in a rain forest the ground gives off moisture. When Cement is poured in a slab a real contractor that does not cut corners will lay down a 8-15 mil thick vapor barrier why? because concrete is porous and moisture vapor will migrate up and through the slab. Not much you can do now.

Last edited by Nailbags; 02-16-2012 at 05:33 PM.
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Old 02-16-2012, 05:33 PM   #6
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Damp concrete floor


Quote:
Originally Posted by jaydevries View Post
it is why a vapor barrier is used due to thermal transfer causing moisture if i remember correctly same reason you use vapor barrier on insulated exterior walls i would look into "research" using a concrete sealing paint "like drylock" as a solution
a good link here http://www.concretenetwork.com/vapor-barriers/
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Old 02-16-2012, 11:08 PM   #7
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You have a few choices, after the fact. Delta FL is one, or Fig. 2- just closed-cell foamboard, or Dricore, fig. 3: http://www.buildingscience.com/docum...ms?full_view=1

Photo 3, if you have the height (same as other, just more detail): http://www.buildingscience.com/docum...g-your-basment

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Old 02-17-2012, 09:07 AM   #8
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Those are great links. Thanks a lot for the info. My only problem with closed cell foamboard is that it usually requires a thermal barrier. Any way to get around that? I also looked into a product called Place N Go flooring that has dimpled underlayment covered with a piece of vinyl tile. Ceramic sounds like it
might be my best bet though.
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Old 02-17-2012, 09:54 AM   #9
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I would use
Dricore or tile.
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Old 02-20-2012, 07:41 AM   #10
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If i use tile do I need to use any special kind of thinset for the concrete? Any special kind of grout? Thanks.

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