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Old 02-28-2010, 10:19 PM   #1
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Default 3/4" pex pipe in the ground?

I have met a plumber who tells me stories of how they put 3/4" px pipe in the ground for main lines...is that legal? or safe? just curious because i was always taught poly and pvc...
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Old 02-28-2010, 10:20 PM   #2
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Code approved here.
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Old 02-28-2010, 10:22 PM   #3
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It may just be me..im just used to the much thicker tougher looker black piping as apposed to the slender pipe.
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Old 02-28-2010, 10:23 PM   #4
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Pex pipe has the same ID as Copper, we do run 1" or larger for our water service lines.
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Old 02-28-2010, 10:23 PM   #5
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Poly? What kind of poly?
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Old 02-28-2010, 10:31 PM   #6
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I run pex for all residential main lines. No joints, easy to fix when the power company cuts it. It is easy to tie in on both ends. No waiting on glue to dry.
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Old 02-28-2010, 10:34 PM   #7
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Quote:
Originally Posted by younger-plumber View Post
I have met a plumber who tells me stories of how they put 3/4" px pipe in the ground for main lines...is that legal? or safe? just curious because i was always taught poly and pvc...
I use pex for water services and in-building underslab lines routinely. Pex IS polyethelyne - basically it's just cooked a different way to cross-link it, and died a different color. Don't tell anyone I told you this, but in a pinch you can crimp a pex ring and fitting on black poly tube, providing it's the right grade (wall thickness). Inspectors would hate that though, so don't do it.

For 1/2" in-house underslab waterpipes I first run 1" utility grade poly and attach both ends. Then I push 1/2" pex (I use up all my heating loop scraps for this) through and then tape up the ends. Don't try it on sleeve much longer than about 20' - 25' as the friction gets bad enough at that length that you can't push that "string" any further.

Here's an example. Three lines - you can see two of them coming up in the background in the laundry - the other comes up at the toilet you can just barely see at the near right.

3/4" pex pipe in the ground?-smid4930_loops003sm.jpg

For water services I only sleeve going through concrete walls/footings and where it comes through the slab, again with utility grade poly-e.

I've seen pex survive being run through crushed stone gravel. It's tough stuff. I'd prefer to have some sand around mine though.
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Old 02-28-2010, 10:39 PM   #8
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That looks good futz. If I sleeve pex, I use foam insuation or pvc thru a wall or under a footing. Us rebels in da South don't use radiant floor.
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Old 03-02-2010, 11:56 PM   #9
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That looks good futz. If I sleeve pex, I use foam insuation or pvc thru a wall or under a footing. Us rebels in da South don't use radiant floor.
seems to be common to use a piece of ABS for sleeving now.
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Old 03-03-2010, 07:54 AM   #10
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Quote:
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Pex pipe has the same ID as Copper, we do run 1" or larger for our water service lines.
Check me if I'm wrong here Ron, but pex has the same OD as copper, not ID.
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