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Thread: Hit a brick wall...could really use some advice

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  1. #1
    Scientist jeremytl's Avatar
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    Default Hit a brick wall...could really use some advice

    Actually, I hit a slab. I'll start from the beginning.
    We're putting a half-bath in a small 3 bedroom/ one bath house built in '63.
    Where the new half-bath is going: it's an area that at one time used to be a patio adjacent to a carport. 20 or so years ago, this area was transformed into a bedroom and adjacent laundry room. So we tore out a wall of the bedroom to join the laundry room and make it big enough to accommodate a pedestal sink and toilet. Everything was fine until we pulled a piece of the floor up to take a look. There is a concrete slab. We drilled through it with a 1/4" bit just to see how thick it was and what was underneath. It's about 6" thick with about a foot and half crawlspace underneath. The big mystery is why they used a rebar mat to pour a slab onto, when they could have used wood floor joists to accomplish the same thing.. But that's another....
    So I need a core drill right? I mean I have to get through it to plumb the toilet and sink. Here is a pic. In the pic you can see the hot and cold for the washer, the drain and the vent, which we were planning to tie into and go to septic. I'm open to any other suggestions.

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  2. #2
    DIY Senior Member dlarrivee's Avatar
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    Rebar mat?

    Is this a suspended slab, or not?

  3. #3
    Scientist jeremytl's Avatar
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    I don't know if I can accurately answer that. With my limited knowledge. I didn't know there was such a thing as a suspended slab. It appears that the perimeter of the slab is supported with block foundation. Additionally, there are at least two block/brick pillars supporting the center of the slab. But it also appears that there was a rebar mat that the concrete was poured into. It sags in some areas. In other words, the slab may be 10" thick in areas where the mat sagged the most. Other areas, the slab may only be 4 or 5" thick.

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    DIY Senior Member dlarrivee's Avatar
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    This could be a can of worms, any more pictures?

    Looks like a decent amount of black mold on that paper faced drywall too?

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    Scientist jeremytl's Avatar
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    that black is old tar paper or some similar moisture barrier paper.that used to be an outside wall.
    so, i'm looking for comments on plumbing through the slab or any alternative ideas.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    I hope you realize that the drain for the sink is NOT big enough for a toilet, so you will have to find a larger pipe, somewhere, and run your drain line to it. They COULDN'T have "poured the mat" without a form underneath it to support the concrete when it was poured, so your analysis is faulty. The ground may have settled underneath it, but 18" is too much for that to have happened, although I did see a grocery store one time where the settlement was even greater than that.
    Last edited by hj; 04-03-2012 at 08:03 AM.
    Licensed residential and commercial plumber

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