Tie in for basement bathroom

Discussion in 'General Plumbing Help' started by BillAinCT, Apr 6, 2018.

  1. Apr 6, 2018 #1

    BillAinCT

    BillAinCT

    BillAinCT

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    Hello all,

    DYI project for basement. I'd like to meet 2012 IPC code for this (town uses this). I've done many plumbing and electrical projects for 30 years. Some past work has been permitted when it was part of a larger permitted project.

    Would anyone please comment on the following plan? The horizontal 4" waste is below slab. The lav is 12' total left and around a corner coming forward from the 3" vertical. The 1.5" horizontal vent will be in the ceiling joists. There will be a 4" check-valve downstream in an unfinished room as required by the town. Hopefully there's enough detail.

    Thank you in advance,
    Bill

    rough_in_2.png
     
  2. Apr 9, 2018 #2

    Plumberx

    Plumberx

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  3. Apr 10, 2018 #3

    BillAinCT

    BillAinCT

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    Thank you. That is an excellent document. I suspect by your suggesting that this document can help me that there is something wrong that this document will show me, which I appreciate. Otherwise you would have said "looks good". :)

    I have been suspect of the 2" trap downstream of the toilet, except that the toilet is not part of the wet vent. The trap is wet vented by less than a foot of the main line. Being a 4" wet vent for the 2" trap, I believed this to be acceptable.

    Bill
     
  4. Apr 10, 2018 #4

    Plumberx

    Plumberx

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    I'm not a pro. This document helped me a lot in the past.
    What is lav?
     
  5. Apr 10, 2018 #5

    Plumberx

    Plumberx

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    just some thoughts...
    see wet venting page 10 in the Winnipeg doc, wc should be connected downstream of all other fixtures.
    I think even only 1' of wet vent before the tub trap, you still have the waste of 2 wcs (one from upstairs?) in this 1' portion.
    Would you have enough room to connect the tub trap to the vertical 2" vent or to the 45 degree portion of this 2" vent (where there is a "b" above the 4").
    Maybe in the basement a 3" wc instead of 4" would help a little, and connected after the tub trap.
    Any possibility to connect the lav to the vertical 3"(have to use a fernco somewhere on this 3" or replace underslab where it's written "4" existing").
    you can put a plug on the tub when not in use (bad solution)
     
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  6. Apr 11, 2018 #6

    BillAinCT

    BillAinCT

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    Thank you for your reply. The room is 5'9" x 5' with 4'x1' taken out of the corner for the 3" vertical drop. The tub was planned for the 5' wall making it's drain farthest downstream.
    The tub can be turned 90* putting the drain up 4' allowing the wc to wye in after the tub but that's not needed. A 5' wall needs to be added at the head of the tub for the fixtures. This wall can now house a 1.5" vent for the tub.
    Having busted up the concrete to firm up these plans, I learned the 4" pipe moves 1" per foot toward the planned trap location so there was 9" less to work with between the trap and wye. The trap would have to come off the wye, turn to the drain and hit the 4" pipe to line up the vertical connection to the drain.
    The 4" pipe is sitting on a footing just past the trap so I now know doing anything further downstream won't be possible without tearing up more floor. That drove the design change to turn the tub.
    I can change the wc to 3" and now wet vent to the 4" main - I cannot vent the wc into the 3" wc pipe without going horizontal to the wall but I can tie it in downstream of the vent into the 4" pipe. The lav/basin and tub can now be dry vented.
    I'll see if I can make a better drawing - not my strong point.

    Thanks again,
    Bill

    rough_in_2.png
     
    Last edited: Apr 11, 2018
  7. Apr 11, 2018 #7

    Plumberx

    Plumberx

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    sorry I'm not sure to visualize all of what you're describing, maybe because I'm french and english is not my native language...

    I don't see the following things in your plan:

    - a clothe washer drain (should be 2" per code, and I now remember I was told by several plumbers it should be connected downstream of everything (at least for 2 basements I have done)... I think it's to avoid soap foaming in the tub or whatever).

    - a backwater valve (required where I live in Canada)

    - an emergency floor drain (should be 3")

    what does "lav" mean in your plan?
     
    Last edited: Apr 12, 2018
  8. Apr 12, 2018 #8

    TomFOhio

    TomFOhio

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    Lavatory or sink...
     
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  9. Apr 15, 2018 #9

    BillAinCT

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    I've come up with the following simpler plan. The left wye 2" to the wall, changing to 1.5" going horizontally for the the lav and the lav vent above 42". Each will tie in with a san tee into the vertical 2" vent.

    The tub is vented after the trap and that continues and wye's into the 3" wc pipe. This vent will require a 2x6 wall but the plumbing will now be easier. That will san tee horizontally at 42" into the vertical 2" vent.

    Regarding back water valve, I'm using a Canplas BWV - the one with the clear top - normally open.
    This room was a 3-car garage that was walled in. It has a sump pit and pump so a floor drain isn't needed.

    Thanks for you comments - I really appreciate them.

    Bill

    rough_in_4.png
     
    Last edited: Apr 16, 2018 at 12:36 AM
  10. Apr 16, 2018 at 3:13 AM #10

    Plumberx

    Plumberx

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    I'll comment, I'd like to know, what is the slope of the 4" drain ?
     
  11. Apr 21, 2018 at 5:17 PM #11

    Plumberx

    Plumberx

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    If it's ok with the slope of the 4" drain, and since the tub now has its own vent, you can connect the 3" toilet to the 4" drain closer to this toilet (before the wall). This will avoid the sharp turn (tub trap to the 2").

    Also if you keep it like this there's a sharp turn on the 3" drain of the toilet, you can use two 22.5 instead of the 45 turn.
     

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