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Old 12-21-2011, 05:10 PM   #1
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PEX Through Foundation Wall


I am trying to figure out the proper way to run a 1" PEX water main through my foundation wall 3' below grade. I understad I should use a sleeve, but don't know how to seal everything up. My thoughts are to bore a 2" hole and put in the largest piece of PVC that will fit. From there I am stuck. Should I try to get some hydraulic cement in between the PVC and the Concrete? What should I fill/seal the area between the PEX and the PVC with? Or, is there a product out there for this application that I cannot find?

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Old 12-21-2011, 06:42 PM   #2
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PEX Through Foundation Wall


Expansive foam works fine (Great Stuff).

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Old 12-22-2011, 09:09 AM   #3
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PEX Through Foundation Wall


Does foam like "Great Stuff" creat a waterproof seal? It will be about 3' below grade so some pressure may be present during heavier rains.
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Old 12-22-2011, 09:15 AM   #4
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PEX Through Foundation Wall


I have used Great Stuff to seal several plastic pipes penetrating through an 8 inch thick concrete wall, seemed to seal perfectly. I also used it to seal a plastic conduit for electrical through a wood sill, that worked well too.
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Old 12-22-2011, 11:08 AM   #5
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PEX Through Foundation Wall


Duct seal

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Old 12-22-2011, 01:14 PM   #6
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PEX Through Foundation Wall


use the great stuff to seal around inside of the sleeve to give the pex a little expansion room,then tar around outside like the rest of your foundation.
3' seems a little shallow to me,we normally go closer to 5' around here to get below frost line
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Old 12-22-2011, 09:27 PM   #7
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PEX Through Foundation Wall


3' out his way should be below the frost line. They get a lot of rain out that way but overall it's fairly temperate as far as temperatures go. Out where you are it gets a lot colder and stays that way a lot longer!
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Old 12-23-2011, 12:51 PM   #8
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PEX Through Foundation Wall


Yep, 3' is where my old galvanized main is at. Would you just bury the PEX, or have it inside PVC and bury it? Or, just bury it in sand--although my fill dirt will be clean.

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