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Old 01-15-2016, 01:36 PM
 
Location: long island, new york
1 posts, read 628 times
Reputation: 10

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I recently had all new concrete installed throughout my homes exterior including around the 600 S.F. detached garage about 10 feet from the house (all sides). I seem to have water coming up from the slab withing the garage after it rains for any extended period of time (3 hrs. plus). does anybody have any experience this kind of event/condition? I assume it is hydrostatic pressure coming through the cracks in the slab. I am considering replacing the slab and installing french drains beneath the slab prior to pouring the new one.
NOTE: I installed a large dry well at the back of the property with all leaders and gutters run to it beneath the grade. No water/moisture detected anywhere around the sill and the roof has been checked.
Confused, pgray317
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Old 01-15-2016, 03:26 PM
 
6,188 posts, read 12,381,512 times
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Concrete is porous. When you get a lot of rain the water table is rising and eventually leaching through your concrete floor and into your house.
French drains are primarily around the perimeter of the slab. One way to slow it down/stop it is to put heavy thick plastic underneath the concrete floor before its poured. If its already poured you can hope to stop it with dry-lock, but its not 100% guaranteed.

Good luck, water is one tricky pain in the neck.
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Old 01-16-2016, 08:35 AM
 
Location: Kings Park & Jamesport
3,180 posts, read 10,073,414 times
Reputation: 1087
Well......A few questions.

1) Did you have this issue prior to the new concrete?
2) Do you have gutters on the garage?
3) Is the new concrete properly pitched away from the structure?
4) Can you post pic?
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