Basement Slab Moisture

 
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Old 03-20-2017, 09:20 PM   #1
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Basement Slab Moisture


Built my house in 2004. Not 100% sure if there is a vapor barrier under the slab. I don't remember if the foundation guy used one before they poured the slab or not. The basement slab is sealed. I have never had water in the basement. I have a 2 sump pit setup where the inside footer tile and outside footer tile are 100% separate.

My issue... I recently put down glue down vinyl flooring. Moisture is coming up through the joints in the floor in one area.

I am thinking it must be moisture wicking through the slab, collecting under the vinyl plank floor and now is showing up as it builds. Before when there wasn't any flooring the moisture must have still been present but was able to evaporate. This isn't all over but in on area.

I have good fall away from the house and downspouts go into tile tied into the city storm sewer.

My thought on solving it...install a radon fan. We don't have radon in my area...or at least no one has those systems that I have ever ran across. The one thing I read that is a side effect of installing a radon system was drastically lowered basement moisture readings. So since my two sumps are separate I can put a sealed lid on my inside sump pit, draw air out of that pit and exhaust it outside.

Thoughts?
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Old 03-20-2017, 09:22 PM   #2
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Re: Basement Slab Moisture


Maybe. Won't know until you try it. Of course, you know what it will take to fix for sure.

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Old 03-20-2017, 09:27 PM   #3
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Re: Basement Slab Moisture


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Maybe. Won't know until you try it. Of course, you know what it will take to fix for sure.
I presume you mean to verify if a vapor barrier does exist?

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Old 03-20-2017, 09:29 PM   #4
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Re: Basement Slab Moisture


I do not see how that will stop moisture coming through the slab.

What is the slab sealed with?
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Old 03-20-2017, 09:47 PM   #5
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Re: Basement Slab Moisture


I will have to look up the brand. It was a penetrating sealer. It was supposed to bond chemically with the concrete.

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Old 03-20-2017, 10:04 PM   #6
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Re: Basement Slab Moisture


Did you moisture test prior to floor install?
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Old 03-20-2017, 10:09 PM   #7
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Re: Basement Slab Moisture


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Did you moisture test prior to floor install?
I did a 24 hour visqueen test. Tape the visqeen down and see what accumulates. Nothing. The floor has been down for a couple months and is just showing this in the last couple weeks.

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Old 03-20-2017, 10:14 PM   #8
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Re: Basement Slab Moisture


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I presume you mean to verify if a vapor barrier does exist?

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Maybe the radon fan will fix your problem. Won't know until you try it.

Right. Cut a hole and see if there is vapor barrier. Of course, just because there is doesn't mean it was installed correctly.
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Old 03-20-2017, 10:30 PM   #9
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Re: Basement Slab Moisture


I know there is plenty of crushed stone under the slab. I remember seeing the basement after the walls were stripped. I just can't say whether or not they placed a vapor barrier before they poired the slab...hell I can't remember last week some days.

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Old 03-20-2017, 10:41 PM   #10
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Re: Basement Slab Moisture


Quote:
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I did a 24 hour visqueen test. Tape the visqeen down and see what accumulates. Nothing. The floor has been down for a couple months and is just showing this in the last couple weeks.

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visqueen was dry and no discoloration on slab?
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Old 03-20-2017, 10:51 PM   #11
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Re: Basement Slab Moisture


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visqueen was dry and no discoloration on slab?
Yep...I will admit I didn't test in multiple spots and I didn't test this area. Hindsight....

I know the fan is treating a symptom and not the disease, but short of ripping out the slab and re-pouring on a proper vapor barrier, presuming that's the issue, (that isn't going to happen) what are some alternative choices?

The fan should depressurize the stone/soil underneath and vent that humid air to the exterior. If the stone underneath dries out wouldn't that stop wicking from the stone through the slab?

Part of my question is a desire to fix my personal basement issue, part of it is to learn if there potential options if I encounter this in the future.
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Old 03-20-2017, 10:55 PM   #12
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Re: Basement Slab Moisture


In your OP you state "moisture coming up through the joints".

Describe the moisture. Why do you think it's moisture?

Could be excess adhesive.
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Old 03-20-2017, 11:02 PM   #13
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Re: Basement Slab Moisture


When I press on the vinyl plank at the seams, a small amount of water comes up between the two planks. The adhesive was a pressure sensitive adhesive applied with the appropriate trowel and allowed to skin as recommended.
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Old 03-21-2017, 12:03 AM   #14
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Re: Basement Slab Moisture


Option 2: Pull the vinyl flooring and acid-stain the concrete.



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Old 03-21-2017, 08:12 AM   #15
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Re: Basement Slab Moisture


If the washed rock is at least 3-4 inches everywhere, most likely the damp spot is where the rock isn't very thick, allowing water to travel via capillary to under the vinyl pieces or as water vapour till it condenses out under the vinyl.

the Constant air flow of the "radon" fan will add to your air conditioning costs year around and bring in a noticeable amount of dust for extra house cleaning and HVAC maintenance

Your basement floor temps aren't below your dew point of the house air during wash days or shower times?

A new slab(2-3") over a working vapour barrier and a 1" of dense foam if you have vertical room.
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Old 03-21-2017, 03:09 PM   #16
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Re: Basement Slab Moisture


Not sure I follow how running the fan and drawing air out from under the slab and exhausting to the exterior will raise my AC Bill and cause a dirty house??
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Old 03-21-2017, 04:46 PM   #17
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Re: Basement Slab Moisture


They make topical applied moisture barriers for under flooring. Sometimes their is a specific flooring adhesive that will work for your flooring that doubles as a moisture barrier. We use these in situations when we cannot get the humidity of the slab low enough to install flooring.


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Old 03-21-2017, 04:49 PM   #18
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Re: Basement Slab Moisture


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They make topical applied moisture barriers for under flooring. Sometimes their is a specific flooring adhesive that will work for your flooring that doubles as a moisture barrier. We use these in situations when we cannot get the humidity of the slab low enough to install flooring.


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There is an adhesive that you can dam near use underwater.

Found out a few years back on the gym I built.
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Old 03-21-2017, 05:17 PM   #19
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Re: Basement Slab Moisture


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Not sure I follow how running the fan and drawing air out from under the slab and exhausting to the exterior will raise my AC Bill and cause a dirty house??


Not sure I get that either. A radon fan is pretty low flow just negative pressure really. Only thing going against you is you don't have radon piping throughout slab to equalize where your pulling from. Might not even matter.

Nothing beats a good drain to clear sky and foam and 10 mil poly under a slab though.
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Old 03-21-2017, 06:34 PM   #20
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Re: Basement Slab Moisture


Yeah the inside footer tile is a sch35 perf pvc. I am going to try it I think...can't hurt. Fans are pretty affordable.

If that doesn't work then I will source a different glue.

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