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Thread: Bathroom Re-model Layout Advice #2

  1. #1

    Default Bathroom Re-model Layout Advice #2

    This post has lots of similarity to CJT's of 7/19/06. I have attached (2) sketches as .JPG files showing what exists and what we want to do. Our goal is to make the tiny 2 room bathroom into a larger single room. At the same time we would like to incorporate a free standing vanity with a wall mounted faucet and a claw foot tub.
    We like the idea of having the claw foot tub under the window and have positioned it accordingly. Since we are on a concrete slab which we strongly believe is steel reinforced, the only way I think we can do it is to route the drain line under the tub and through the wall under the window. We would put the "P" trap outside in an a access pit with a cover. Does anyone see a problem with this.
    We really wanted to put the toilet further to the left but have it situated so its outlet is within the confines of a pit under the tub's present location. Our thinking is that we can dig out under the slab and connect the sewer lines accordingly.
    We realize that it will be lots more work when we are relocating the tub and toilet but just want to know if it seems practical. We aren't architects or contractors, just homeowners. We may do the work ourselves subcontracting the more difficult parts.Name:  Existing.JPG
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    Name:  Proposed.JPG
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  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    The P-trap needs to be under the tub. Running that long line to it would allow crud to accumulate and it would quickly start to smell, and it would not pass code. Unless the slab is a post-tensioned slab, where cutting a cable is likely to cause the slab to fail, while a pain, it is fairly common to cut reinforced slabs to move things around. There are various ways to add back in reinforment steel prior to refilling the holes you make. If it is a tensioned slab, then you need a structural engineer.
    Jim DeBruycker
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    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

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    Quote Originally Posted by jadnashua
    The P-trap needs to be under the tub. Running that long line to it would allow crud to accumulate and it would quickly start to smell, and it would not pass code. Unless the slab is a post-tensioned slab, where cutting a cable is likely to cause the slab to fail, while a pain, it is fairly common to cut reinforced slabs to move things around. There are various ways to add back in reinforment steel prior to refilling the holes you make. If it is a tensioned slab, then you need a structural engineer.
    Thanks jadnashuafor the quick reply. There is no possiblity of my slab having post tensioning cables because of its age (45+ years). Butm there would certainly be a rsik to slab damage if I have the hole drilled. I live in the Houston, TX area where slab cracking is a common occurence because of unstable soil conditions.
    Now I have a new idea. The toilet's vent pipe must be in the wall between the bathroom and the master bed room. Shouldn't I be able to fit a P-trap between the end of the tub and the wall but above the floor. Then I would discharge discharge the water into the old toilet vent line? I have read somewhere that the horizontal drain line is 4" above the floor so it seems like I should be able to make a 1 1/2" P-trap compact enough to fit. If necessary I could chip out the concrete to make a little depression for the P-trap to lay in.

  4. #4
    Master Plumber master plumber mark's Avatar
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    Talking fear of slab problems

    dont be a worry wart about that slab floor...

    if it is 45 years old its done all the settling its going to be doing by now....


    you are going to be moving quite a lot of drain lines here

    according to your second propopsed postt

    and its all going to have to be torn out to some extent...

    you will most likely run into "steel mesh" in the floor if the floor

    is that thick. 5-8 inches... OUCH

    ... the steel mesh usually just needs to be cut out of the way

    with some heavy duty cutting snips and you are good to go...

    and you might get lucky and it be only 3-4 inches thick....




    because you are going to be doing some trenching under that slab to

    get the pipes where you want them a LOT of concrete is probably going to

    have to be displaced here....

    your biggest concern is where the water lines are....if they are over head

    its no problems at all.... if they are in the slab then be careful, careful careful....


    just make it big enough to work with then re-fill the hole back in with some sand and about 4 inches of finishing topping concrete
    and you are done..


    if you are really worried about movement or cracking...throw some
    rebarb back down into the trench after your plumbing is through

    sometimes you just have to do what you got to do----to win the battle----.


    just tear into it and if in 30 years if cracks start to form.... just call me a dumb ass---
    Last edited by master plumber mark; 07-22-2006 at 05:34 AM.

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