DWV plan for new bathroom

Discussion in 'Remodel Forum & Blog' started by MattF, May 6, 2018.

  1. MattF

    MattF New Member

    Joined:
    Dec 17, 2017
    Location:
    Newfoundland
    I'm planning on adding a new bathroom to my basement. I have limited (none) experience with new plumbing layouts. I think what I plan to do should be ok. Still having a hard time wrapping my head around wet venting. I've attached a drawing of my plans for the DWV plumbing. Anyone willing to have a look and see if there are any problems with this?

    Thanks!
     

    Attached Files:

  2. Terry

    Terry Administrator Staff Member

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    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    I would wye off for the shower and use a 2" combo up to a 2×1.5" santee and arm over to the lav. The 2" wet vents the toilet.
     
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  4. MattF

    MattF New Member

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    Dec 17, 2017
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    Thanks Terry! Really enjoy your website. It's been a great resource for me.

    I foolishly went ahead and started today. I've attached a picture of what I have so far. Big orange cap on the toilet stub, small orange cap on pipe that will go to the lav, vent will continue on straight up from the vertical pipe (inside the wall). Shower will be on the right. The two inch pipe going from the shower to the main three inch line is about 4 feet long, I figured that was short enough to get away with using the vent from the lav. I'll pick up the parts to connect the vent with the shower line tomorrow.

    IMG_20180507_181826.jpg

    Thanks again,
    Matt
     
  5. Terry

    Terry Administrator Staff Member

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    Plumber
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    The shower isn't vented that way. The lav goes off the shower and not the toilet at hat point.
    If you're keeping it that way, the shower needs to be vented before it enters the toilet drain downstream of the venting.
     
  6. Stereo

    Stereo New Member

    Joined:
    Dec 14, 2019
    Location:
    Colorado
    I, too, am still trying to understand horizontal wet vents. Since the shower drain enters the main drain horizontally, I thought the lav vent would provide the air for the shower drain via a horizontal wet vent, but obviously, I’m wrong. Can you please explain to us neophytes why the “lav goes off the shower” rather than the shower going off the lav? Thank you for any clarity you can provide.
     
  7. Reach4

    Reach4 Well-Known Member

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    Sep 25, 2013
    Location:
    IL
    IPC is usually more permissive than UPC. https://wabo.memberclicks.net/assets/pdfs/Plumbing_Venting_Brochure_2018.pdf I think the picture on page 12 would not be allowed under UPC.
     
  8. James Henry

    James Henry In the Trades

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    Occupation:
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    Wet venting doesn't work in every single situation.
     

    Attached Files:

  9. James Henry

    James Henry In the Trades

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    Occupation:
    Plumber
    Location:
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    The sizes of all your drains is good. Unless you want to tear everything out and start over so you have a proper wet vent system, just run a vent off the shower drain and tie it into the lav drain.
     
  10. Stereo

    Stereo New Member

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    Dec 14, 2019
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    So under the IPC, which I’m under, this configuration would work, correct?
     
  11. James Henry

    James Henry In the Trades

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    Jul 23, 2019
    Occupation:
    Plumber
    Location:
    Billings, Montana.
    Who are you responding to?
     
  12. Stereo

    Stereo New Member

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    Dec 14, 2019
    Location:
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    Anyone with knowledge of the IPC could answer, but my last post was in response to Reach4. I asking whether MattF's layout is acceptable under the IPC.
     
  13. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    I think so based on that link, if MattF's pipe sized are big enough. Is the vent from the lav 2 inch feeding a combo? Maybe there is some reason this considered different than that page 12. I am not sure.
     
    Last edited: Jan 17, 2020 at 8:12 AM
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