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Old 06-18-2010, 08:41 PM   #1
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garage water seep through floor?


Hi,
Can moisture on the garage floor be caused by condensation, or is this water coming up through the floor?

The picture below was taken right after a rainshower....it is 80 degrees here in chicago. This home is 3 years old, and if I had to guess the builder probably skimped and did not put plastic before concrete was poured.

Thanks for all suggestions!
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Old 06-19-2010, 05:18 AM   #2
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If condensation, the whole floor would be wet, not just in the control joint from water below.

Be safe, Gary
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Old 06-19-2010, 07:49 AM   #3
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Quote:
Originally Posted by bergerdude View Post
The picture below was taken right after a rainshower....it is 80 degrees here in chicago. This home is 3 years old, and if I had to guess the builder probably skimped and did not put plastic before concrete was poured.

Thanks for all suggestions!

I'd say you're a great guesser. Very common to pour garages right over the gravel w/o vapor barrier. It is only required on heated garages here, & I assume it's the same there as well. The slab is merely "sweating" due to the high humidity & temperature differences between the earth & air.

I can't say I have any great long term solutions, as most sealers won't properly bond to a surface like this for any length of time. You may get lucky with a sealer called "siloxane", as it penetrates deeper, but it may not last real long either.
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Old 06-19-2010, 12:12 PM   #4
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if it weren't so (*%#%*()&$# expensive, you could drill holes in the floor & sub-seal from underneath but that's usually only done for commercial/ industrial/institutional/municipal/state/fed stuff,,, rarely when someone has to spend their own $$$ but, rather, use up taxpayer's $$$

there are vapor barrier epoxies that would work but if there's head pressure, not likely !
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Old 06-21-2010, 01:44 PM   #5
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Quote:
Originally Posted by itsreallyconc View Post
if it weren't so (*%#%*()&$# expensive, you could drill holes in the floor & sub-seal from underneath but that's usually only done for commercial/ industrial/institutional/municipal/state/fed stuff,,, rarely when someone has to spend their own $$$ but, rather, use up taxpayer's $$$

there are vapor barrier epoxies that would work but if there's head pressure, not likely !
$5 worth of plastic could have solved this.

Anyway...would dryloc work on something like this?

The garage is on grade (I think)...meaning that the garage floor is not any lower than the surrounding ground.

Funny thing is, I get a good frost heave on my asphalt during winter....could my location just be THAT Wet?

Anyway, there are two gutter downspout that come off the garage, I will extend those in to the swale 8 ft. away, and possibly dig and put in draintile in the swale (if this would help???)

Thanks!
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Old 07-03-2010, 12:22 PM   #6
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Just an update....plastic/vapor barrier under a slab is Code in my area.

The concrete contractor says "they must have done it" if it is code, but thee is no way to check.

The Municipality whom gave the permit for occupancy to the builder says "our guys don't sign off on stuff they don't see" so it "must" be there.


A lot of covering their @sses to be sure.

What can I do dehumidifier, ceiling fan, exhaust fan?
Long term cost (electrical) and effectiveness opinions would help.

Of course everytime I open the garage door there will be a changeover with moist summer air.....

So any opinions? Thanks in advance!!
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