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Thread: Concrete slab repair question

  1. #1

    Default Concrete slab repair question

    I also put this in the Plumbing section, but think maybe it belongs here.

    My plumber sawed long trenches in my slab to lay down a new sewer line for a new toilet in a remodeled bathroom. The trenches are about 10 inches wide and 12" to 18" deep. I can find nothing to tell me how these trenches should be repaired to insure a stable slab. I have seen something about epoxy for the rebar. What is the expoxy and how should it be used? What should be done about the water barrier plastic? Any suggestions would be greatly appreciated, because he is planning to just fill up the trench with concrete and have me sign a release.

  2. #2
    General Contractor Carpenter toolaholic's Avatar
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    Default you can,t lap the plastic now, no big deal

    just let the man do his job, don,t worry it to death!

  3. #3
    Master Plumber master plumber mark's Avatar
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    Talking leave him be

    we do it that way all the time....

    usually , we take the fill and jujst put it back in then
    fill the trench with about 4 inches of concrete...

    its no big deal....it isnt going to hurt the stability of the slab
    and their is no problem with a vapor barrior...

    ------------------------------------------------------------------

    but if you are really going to worry yourself to death,
    you can always go out yoiurself and buy a roll of black visqueen
    at lowes for about 10 bucks for a 10 x 50 foot long sheet..

    just insist that he at least roll it out in the
    trench after he has backfilled the dirt back in ...
    then tuck it into bed on the sides of the trench....

    its about as good as you can do if it eases your mind.

    if you absolutely must...

    I doubt he is going to grumble too much about
    a small amount of extra work like that either...


    have some doughnuts and coffe ready for them
    the day they do this phase of the job....

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default concrete

    Put the dirt back in the trenches, but because it was saw cut, the edges of the concrete are straight and smooth so the inserted concrete could slide down if the dirt settles. Anything that ties the new concrete to the old will prevent this. Rebar inserted into holes in the existing concrete, or cutting depressions into the sides of the cut so the new concrete is keyed to it, are two ways to lock the two together.

  5. #5
    DIY Senior Member sulconst2's Avatar
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    Default

    hilti makes a 2 part epoxy thats used in concrete for threaded rod. definitely overkill. put the fill back in. tamp as much as you can. you could wet it to compact further. and shoot concrete nails into sides of the cut. dont sink them. and this will help tie in the pour.

  6. #6

    Default Thanks for the Advice everyone

    I was concerned that the new concrete would sink as the soil settled. Perhaps cutting at an angle would have been a better way. What tool will make the grooves? (I know he's going to ask)

  7. #7
    General Contractor Carpenter toolaholic's Avatar
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    Default i have a concrete saw and they cut straight ,not beveled

    your plumber did the cut to the standards of the trade. you can rent a roto hammer drill ,and drill holes every 16" on both sides, install re=bar dowels
    and maybe one 1\2" bar the length. this is never done and would be an EXTRA

  8. #8
    Master Plumber master plumber mark's Avatar
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    Talking you are all nuts

    that poor plumber whoever he is
    will be getting onto this site to tell us all to mind our own
    business and leave his alone...

    if he just tamps the dirt down just a litttle with the
    end of a sledje hammer, then simply pours in
    the concrete it will work fine, unless you plan on
    having a herd of elephants living in that space.
    (or my sister-in -law)

    you could lay some rebarb in the hole and you
    could lay some visqueen through the bottom of the
    trench over the top of it all if you absolutely must,
    they wont hurt, but are not really necessary.

    So as long as the poor guy is pouring a fairly thick slab
    of concrete throughout that trench, lets say 4-6 inches thick,
    it really aint gonna matter probably in all our
    natural lifetimes.

    We will all be dead and gone probably 75+
    years before trouble will ever start , if ever....and thats not bad.


    what are you going to nit pick next---- radon mitigation???


    let the man do his job.
    Last edited by master plumber mark; 09-18-2005 at 04:31 PM.

  9. #9
    DIY Senior Member sulconst2's Avatar
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    Smile

    so how big is your sister in law? is she single?

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

    so how big is your sister in law? is she single?

    He implies that she is a double wide, not a single. Anything that creates an imperfection in the cut sides will key the new concrete the old. There is no concrete cutter in existance who would attempt to cut the concrete on a bevel, even if their saws could do it, which they cannot;

  11. #11
    Master Plumber master plumber mark's Avatar
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    Talking sister in law

    oh I wold put her at about 375
    give or take 20 lbs.

  12. #12
    DIY Senior Member sulconst2's Avatar
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    Default

    too much woman for me! betcha she could compact some soil!

  13. #13
    Master Plumber master plumber mark's Avatar
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    Talking good compaction

    when she is in town she stays with us.. its ok..

    the good thing is she lives far away and is not
    around all that much, x-mas --ect
    the kids like to see her and she baby sits -- so its tolerable.

    but when she walks through my office my computor monitor

    actually starts to wobble on its paltform..

    its like a herd of wildabeasts on stampede..
    Last edited by master plumber mark; 09-19-2005 at 07:25 AM.

  14. #14
    Moderator & Master Plumber hj's Avatar
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    Default sil

    Sounds like Al Bundy's mother in law.

  15. #15
    DIY Senior Member finnegan's Avatar
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    Default

    Master Plumbing is right on. (No comment on his sister-in-law)

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