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Thread: 2 water closets back to back

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  1. #1
    DIY Junior Member poky1234's Avatar
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    Default 2 water closets back to back

    Hello,

    Iam planning a reno in a 2 storey century home. I am located in Ontario Canada and would like to get advice regarding installation of 2 water closets back to back on the 2nd floor , vented by the 3 inch stack vent. I have provided a diagram. Both toilets would be 12 inches away from wall and 3 inch vent runs up through 2nd floor ceiling and out through roof. Both water closets would drop into 3 inch horizontal waste pipe , run 10 feet along joist cavity then turn and drop to basement. I would like to know if this would be to code. I need to run the 10 feet horizontally to reach a wall to drop down through. Any help would be greatly appreciated.
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  2. #2
    In the Trades mtcummins's Avatar
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    I believe you have it piped correctly, assuming this is all that's on this line (you're not tying into an existing stack - that could change things). I also believe you only need a 2" vent, make sure to tie it in with a combo wye 1/8 bend, not a tee.

    But I'm def not up on canadian code, so someone who is, step in and correct me please

  3. #3
    DIY Junior Member poky1234's Avatar
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    Thanks for the reply. There will be one lav upstream tied into the 3 inch pipe and a tub , shower and second lav tied in downstream all of which will be dry vented and tied into the 3 inch vent shown in the diagram. I will tie in the dry vents up in the attic. I will use the wye and 1/8 bend to connect the 3 inch vent to the 3 inch horizontal waste pipe. Would this be ok? Thanks

  4. #4
    In the Trades mtcummins's Avatar
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    You should probably draw out all of what is being tied in there so that its clear, and then wait for one of the people on here more familiar with canadian code to verify its ok. How things tie together can change things.

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    If your using 1.6 or 1.28 flush toilets it will not work. The new toilets flush so fast that one will pop up into the other. Do a search here on back to back toilets. It has been discussed many times.

    John

  6. #6
    DIY Junior Member poky1234's Avatar
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    Attachment 19057Name:  PLUMBING DIAGRAM 2 001.jpg
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Size:  23.2 KBhere is another diagram that might make it clearer. Thanks

  7. #7
    In the Trades mtcummins's Avatar
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    I don't want to argue with John, as I'm sure he's far more experienced than me, but I believe your setup to be standard practice. If you didn't have the vent between the 2 WCs, you'd def have problems.

    The rest of your drawing looks good to me. You can combine the vents above the flood plain of the highest fixtures, if that makes piping easier... so your tub could go in with the 3" off the toilets, Lav/shower can combine at 42" (typically) above floor into one vent.

    Again, this is all based on US though, I know basically nothing about Canadians specific code. And I'd like to hear more input about the toilet thing. I'm pretty sure that the way you have it drawn is how they install commercial bathrooms up to 3 toilets, and would be the same for 4 or more, except they'd bump up to 4" pipe. But not sure, so don't act solely on my word

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