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Thread: Post tension cable is in the way

  1. #1

    Default Post tension cable is in the way

    Need to move rough in to accomadate new tub overflow. Looks like a post tension cable is in the way. Am I s****ed

  2. #2
    Master Plumber master plumber mark's Avatar
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    Talking What is a post tensoion cable??

    What exactly are you talking about??

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Do NOT cut it! You need to talk to a structural engineer.

    This kind of construction is common in earthquake country from what I hear. Cables are embedded in the slab with plates and bolts at the outside, after the slab cures, the bolts are tightened, putting tension on them (a LOT of tension). This helps prevent the slab from cracking if it gets bounced around or if the ground is unstable (like clay).
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4

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    [QUOTE=master plumber mark;158049]What exactly are you talking about??[/QUOTE

    The location of the drain for the new tub is right over a post tension slab cable. There is not enough room to move the tub to avoid the cable

  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    Post tensioned cable

    Well, you can't move the cable.
    Is there someway you can arrange the waste and overflow around where the cable is?

    Sometimes you can use fittings and position the drain over a bit. I do that sometimes when a floor joist is "on center" with the drain.
    There is normally about three inches you can move it with fittings.

    Or you may have to raise the tub some.

  6. #6

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    One end of the tub is against the wall the other end if we move it the other way it would go intowhere the shower is. Trying to see if we can use fittings to get it done but there is very little room to be able to tighten the connection to the p trap

  7. #7
    Plumber jimbo's Avatar
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    You did a very good job to DISCOVER the cable. The question we usually get is "hey, I cut this cable when I was jacking my slab.....what do I do now?" They can be reconnected, but it is not cheap!

  8. #8

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    Just received a call back from a company here that does post tensioned slabs. He said that most are over engineered and the cutting of one cable should not be an issue. He says if cut it would move about 3 inches in the slab and not go shooting out the side of the foundation. Now I'm really confused.

  9. #9

    Default

    I think the cable would be a non issue if I use a direct outlet or direct drain overflow. Just have to find someone who has these, I understand it is hard to find.

  10. #10
    Moderator & Master Plumber hj's Avatar
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    Default cable

    Any specialty company will have a catalog with a "toe outlet" waste and overflow in it.

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