How to bring water into a slab foundation. The concrete is coming Thurs!!!

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by MaxBlack, Dec 18, 2012.

  1. MaxBlack

    MaxBlack Member

    Messages:
    67
    Location:
    TX Hill Country
    This is Tuesday evening and the concrete trucks roll on Thursday: guys I need help!

    I have a trench to my new storage barn foundation, and today the builder was helping me with some service items: A 2" conduit for electric, a 3/4" for telephone, and a 1" PVC pipe for water. We were laying them in a convenient beam/trench/footing. He said "you know, PVC doesn't meet code for water, it can crack & leak under the pressure of the concrete" so I pulled it out. But I really need to get water into the same area in order to take advantage of my trench which is at the front of the building, and I wanted to have a hose bib on the opposite side of the building which would be VERY difficult to get to otherwise (rocky soil, long story).

    So how to bring a water pipe into the same area with the other 2 conduits? Maybe PEX tubing poked-thru a 1 1/4" PVC pipe with a sweet 90 elbow (to protect the PEX) or something? Or just go with the PVC Sch40 pipe, but put a thick layer of sand over these conduits (they only extend 8' in before stubbing-out). I really don't want, as I said in the FRONT of the building, to bring the water pipe out of the trench on the outside of the wall and then pipe thru the walls to get to the backside (about 20' away). Note I'm in So Texas so no such thing as a frost line, though a pipe exposed to air can of course freeze down here several days of the winter.

    There must be an approved way to move water thru a concrete slab??? :eek:

    Here's a pic showing me in the middle fiddling with tape on the current stub-outs and the trench coming-in from the right. Where the guy with the board and the Hilti leveler is on the left is where I'd wanted the hose bib. I'm happy to run pipes in the walls, but would at least like to get to where the other stub-outs are... thanks for any tips.

    Slab.jpg
    Last edited: Dec 18, 2012
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,412
    Location:
    Bothell, Washington
    You can bring PEX through, and I would put foam insulation around it. That prevents the concrete from touching the pipe and allows for expansion and contraction.

    I've looped plenty of soft copper under and through slabs too, Same thing about protecting the pipe from coming in contact with the concrete.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,230
    Location:
    Cave Creek, Arizona
    I ALWAYS loop a copper line through the concrete with a plastic sleeve around it. PVC IS approved outside up to the building, but NEVER inside the building, and definitely NOT under concrete, because you would have to use fittings to make the turn and they could crack.
  4. bluebinky

    bluebinky Member

    Messages:
    408
    Location:
    Santa Clara, CA
    As of a few years ago (six or seven), a little farther north in Texas, they used rolled soft copper (type K). Any decent building supply house should know what you want if you tell them what you are doing...

    You don't want it directly touching the rebar for sure -- ditto on the plastic sleeve or foam.

    Be careful where plastic meets copper. Female plastic thread split open and male threads can break off. But, that's a discussion that can happen after the concrete goes in!
  5. MaxBlack

    MaxBlack Member

    Messages:
    67
    Location:
    TX Hill Country
    I really like the PEX-with-insulation idea--but omg Home Depot only sells 3/4" in 100ft rolls for $50 bucks. And it doesn't look as if Sharkbite connectors will allow me to use my PVC Sch40 pipe, it only works with CPVC? Oh well, I will sleep on it and run off to the store in the morning.

    Guess it's time I learn about this stuff, and pay the price along the way... Thanks guys.

    EDIT: OK I see HD has 3/4" x 25ft PEX pipe for only $13.84. I may just be able to afford the fittings at that price! ;)
    Last edited: Dec 18, 2012
  6. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    You're on the early part of a house build and crying about $50 for a proper water line?

    Ditch the PVC crap.
  7. bluebinky

    bluebinky Member

    Messages:
    408
    Location:
    Santa Clara, CA
    He's in Texas. It may look like a house to a mere yankee, but it is really just a storage shed... :cool:
  8. MaxBlack

    MaxBlack Member

    Messages:
    67
    Location:
    TX Hill Country
    Hmmm I did not know that I was "crying"! :p

    Thank you bluebinky--my reply to the Canadian might not have been as diplomatic as yours. :rolleyes:
  9. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,230
    Location:
    Cave Creek, Arizona
    quote; but omg Home Depot only sells 3/4" in 100ft rolls for $50 bucks.

    50' rolls of copper are refrigeration tubing, not plumbing copper. You will NOT get a 60' roll of plumbing copper tubing for anywhere near $50.00, (it would be closer to $200.00). It is a failure waiting to happen if you use it, because it is thinner than any tubing used for plumbing purposes.
    Last edited: Dec 19, 2012
  10. MaxBlack

    MaxBlack Member

    Messages:
    67
    Location:
    TX Hill Country
    The deed is done. I also bought a metal 90deg "helper" ell for the 3/4" PEX and the insulation still slipped-over it just fine.

    The Home Depot guy confirmed this was a "normal" way to go, for whatever that's worth. He was sorta cranky; I dunno if it was the early 7am hour, or maybe he was Canadian...!

    ;)

    Thanks Terry for the instant help, and for maintaining this site. Enjoy your holidays! :cool:

    PEXroughin.jpg
  11. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    My mistake I thought barn meant house in Texas.
  12. bluebinky

    bluebinky Member

    Messages:
    408
    Location:
    Santa Clara, CA
    All kidding aside, I do miss Texas. I've spent a considerable amount of time in several places like Seattle, Toronto, and now San Jose. I can't wait to get back to my place (my workshop is bigger than the house) in good old Waxahachie Texas. I could almost live comfortably there on what I'm paying in California state income tax right now.

    Besides, Texas is way bigger than Canada if you don't count ice :p
  13. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    I wasn't aware we were arctic here...
  14. MaxBlack

    MaxBlack Member

    Messages:
    67
    Location:
    TX Hill Country
    Please, please bluebinky, do Not speak well of Texas. And especially to your fellow Californians!!! We have too many of them coming here already!

    :p ;)
  15. bluebinky

    bluebinky Member

    Messages:
    408
    Location:
    Santa Clara, CA
    You're right, sorry, I'll try to keep it down.

    I lived in the Seattle area for over 30 years, until it turned into California, and I was forced to move to north Texas. I'm not sure which is worse, the constant drizzle with lots of Californians, or the tornadoes, ice storms, lightning, and heat tearing everything up all the time...
  16. bluebinky

    bluebinky Member

    Messages:
    408
    Location:
    Santa Clara, CA
    You're right, sorry, I'll try to keep it down.

    I lived in the Seattle area for over 30 years, until it turned into California, and I was forced to move to north Texas. I'm not sure which is worse, the constant drizzle with lots of Californians, or the tornadoes, ice storms, lightning, and heat tearing everything up all the time...
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