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Thread: 2 water closets back to back

  1. #16
    In the Trades mtcummins's Avatar
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    Again, don't want to argue, particularly if Canadian code is different here, but I don't think you have to separately vent the 2nd toilet. Correct me if I'm wrong.

    That said, it certainly wouldn't hurt anything, you'd do a 3x3x2 wye/45 to a 2" vent after the 2nd WC, then take it up above the highest flood plain (typ. 42") and tie it into the 3" vent with a santee (upside down).

    Can someone give insight about the venting issue? I'm pretty sure you can put 3 WC on a single 3" line, with the vent between the first 2, and need no further venting, but I could be mistaken.

    What I WOULDN'T do, is put both toilets into a double santee. Too many problems with that setup with today's toilets...

  2. #17

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    a 1-1/2" back vent on downstream toilet is all that you need..and yes connect to the 3 " above FLR of lav

  3. #18
    DIY Junior Member poky1234's Avatar
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    Quote Originally Posted by mikeplummer View Post
    a 1-1/2" back vent on downstream toilet is all that you need..and yes connect to the 3 " above FLR of lav
    Could the backvent on the downstream toilet be a 2 inch wet vent coming from the tub? Thanks

  4. #19

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    as long as the tub is connected as a vertical continuos waste

  5. #20
    DIY Junior Member poky1234's Avatar
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    Quote Originally Posted by mikeplummer View Post
    as long as the tub is connected as a vertical continuos waste
    Thanks Mikeplumber, I'll proceed like that with the tub with a vertical continuous waste vent , venting the downstream toilet. One last question if I may, When you turn 90 % horizontally on a horizontal waste pipe can you use a long sweep 90 elbow or 2 45s ?

    Thanks again.

  6. #21
    In the Trades mtcummins's Avatar
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    The easy rule is, anytime you turn TO horizontal (whether from vertical or horizontal), use a long sweep 90 or 2 45s. Turning to vertical you can use a medium 90.

    A trap arm, I think, can break this rule and use a medium 90 to stub out of the wall. That's the only time I'm aware of a waste line being allowed to be medium 90 going to a horizontal.
    -mike-

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