Fixing DWV in bathroom

Discussion in 'Plumbing Code Questions' started by admantechno, Jan 12, 2012.

  1. admantechno

    admantechno New Member

    Messages:
    7
    Location:
    New Mexico
    Please take a look at the attached model I just quickly drew. Whoever did the work previously made swiss cheese out of a 2x4 load bearing wall that I'm replacing with a new 2x6 wall to accomodate the proper piping thats replacing pretty much everything but the main stack. You dont even want to see what was there before. So light me up, whats wrong with what I have here? What can I clarify better? And I follow UPC.

    Can i wet vent the shower like that?

    Attached Files:

  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,122
    Location:
    Bothell, Washington
    No.
    You can't wet vent the washer over the shower.

    Also, the shower needs to be vented within five feet.

    And the washer should come in above the inlet of the drain for the lavs.
  3. admantechno

    admantechno New Member

    Messages:
    7
    Location:
    New Mexico
    Damn Terry, you're quick to reply, thank you! Ok, so how about 2 combo wyes stacked, bottom for lavs and top for washer, corrected?
    And I know the 5' distance for shower vent, hence annotated. I guess I'll see whats under the slab to tie in the shower drain and run a seperate vent up to the right of the lav drains and take to the main. Better?
  4. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    I would leave the washing machine connected where it is and keep the vertical stack 3" and install a cleanout and dump one lavatory above it. Install a wye in the shower drain with a short piece and a long sweep 90 turned up to catch the other lavatory and continue up and revent. This will vent your shower properly and get rid of that washing machine connected to the cross fitting you have now.
  5. admantechno

    admantechno New Member

    Messages:
    7
    Location:
    New Mexico
    plumbing.jpg

    Better?
    Any further suggestions?
  6. Terry

    Terry Administrator Staff Member

    Messages:
    15,122
    Location:
    Bothell, Washington
    Lav one is wrong. There is no venting there.
    You will need to add the vent and tie it in at the 42" level.
  7. admantechno

    admantechno New Member

    Messages:
    7
    Location:
    New Mexico
    Stupid oversight on my part, thanks again Terry!
  8. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    Dump the lavatory over the washing machine and leave everything else as it is. No extra vent needed. The washing machine would be wet vented.
  9. admantechno

    admantechno New Member

    Messages:
    7
    Location:
    New Mexico
    Terry says "washer should come in above the inlet of the drain for the lavs" and you say "Dump the lavatory over the washing machine", so which is it?
  10. Terry

    Terry Administrator Staff Member

    Messages:
    15,122
    Location:
    Bothell, Washington
    Based on the first drawing, you had the waste from the lavs coming into a fixture cross that was supposed to be venting the washer. In that drawing, I would have raised the washer santee higher to make sure that the washer was vented higher then the incoming lav.

    The double lav on the right of the first drawing was correct with the fixture cross for just the two lavs.

    Hackney suggests putting a santee above the washer santee and wet venting the lav over the washer.
    Since it is a lav, which normally could use 1.25" waste, you gain your two pipe sizes by dropping it into a 2" wet vent.

    If it had been a laundry sink, which requires 2" waste, then it wouldn't be considered a wet vent in some places. Washington no longer allows a laundry sink wet vent over a washer, but the lav over the washer should be fine, since it's rated as a smaller fixture. hj says that Arizona is one place that allows that though for a "laundry sink".

    Just so you know, the State doesn't consider us a journeyman plumber until we have worked 6,000 under an apprenticeship, and have passed the test for journeyman. I'm sure all of this seems simple, but the fittings can be arranged many different ways with many different results.

    You're getting there though with these drawings. Pretty soon you will have the right one.
    Last edited: Jan 20, 2012
  11. admantechno

    admantechno New Member

    Messages:
    7
    Location:
    New Mexico
    Plan on doing this tonight. Whats the bad news?
    plumbing 3.jpg
  12. nukeman

    nukeman Nuclear Engineer

    Messages:
    711
    Location:
    VA
    Not a plumber, but it looks good to me. My only question is whether you really have a double fixture fitting and not a double santee or double wye. You will want the double fixture fitting, but I have not seen them in the big box stores. You may need to go to a real plumbing supply place for one of those. The other thing is to make sure to use the right style of elbow under the lav connections. I would use a long turn elbow there. Make sure that you don't use a vent elbow there.
  13. Terry

    Terry Administrator Staff Member

    Messages:
    15,122
    Location:
    Bothell, Washington
    It looks good to me.
    And same comments as Nukeman
    Double fixture fitting for the lavs
    Long turn 90 bend below
  14. admantechno

    admantechno New Member

    Messages:
    7
    Location:
    New Mexico
    Thanks guys. I'm aware of using all long bends and the proper double fixture fitting. I labeled most of them properly to show that, despite not having the correct models to put in the drawing.
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