Venting Shower for new 3/4 Bath???

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by RiverLodge, Oct 27, 2018.

  1. RiverLodge

    RiverLodge Member

    Joined:
    Oct 27, 2018
    Location:
    Paradise Valley, MT.
    Looks simple enough.

    Is it ok to run this shower drain approximately 1' and tie it into the 3" vent with a vertical santee? Or option #2, run the shower drain to vanity wet vent?

    Attached photo #1 - Shower Trap in Crawl - #2 Washer directly above on main cabin floor - #3 - The big picture, shower right / vanity center / WC will be last downstream left / 4" wastepipe to septic.

    Thanks in advance for your professional response.
    RiverLodge
     

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  2. cacher_chick

    cacher_chick Test, Don't Guess!

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    If I am looking at your 1st drawing correctly, the shower can connect to the 3" vent which I assume is going straight up through the roof.

    Once that shower is using the line as it's drain, none of the other fixtures there will be able to use it as a vent, unless the vent connections are made on the floor above.
     
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  4. RiverLodge

    RiverLodge Member

    Joined:
    Oct 27, 2018
    Location:
    Paradise Valley, MT.
    Thanks for your response, Cacher-. Photo #2 shows the 3" vent just above the shower sub-floor where I tied in the washer drain and vent. The 3" vent continues straight up through roof.

    So the washer is draining into the 3" vent above my proposed shower trap. Looks good to this Master Electrician, how about you?

    The center vanity has been vented above ceiling and ties into the 3" vent prior to roof penetration.

    Again, thanks in advance for your professional responses to this post.

    RiverLodge
     
  5. Terry

    Terry Administrator Staff Member

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    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    A washer can't wet vent a shower. You would run a separate vent up for the shower and revent at 42" above the floor.
     
  6. RiverLodge

    RiverLodge Member

    Joined:
    Oct 27, 2018
    Location:
    Paradise Valley, MT.
    Thanks for the response, Terry.

    Option #2 if correct? - Run the 2" shower drain to the vanity 2" drain line (vanity drain stubbed down center photo#3). The vanity is dry vented, connected above ceiling to the 3" stack vent then penetrating through roof.

    I am intrigued by this science of "Wet Venting" and thinking it is possible for this shower drain to comply.

    Again, thanks in advance for any professional response to this post.

    Looks like Seahawks beat up on my Lions today! Happy to be here in Montana.

    RiverLodge
     
  7. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Option 2 works. A lav can get by with a 1.25" drain line. By increasing to 2" it allows space for water to drain and still room for venting the shower below. It's wet, because the lav drains into the venting. It also allows snaking of that portion of the vent because of the plumbing above.

    A washer isn't allowed because it's a pumped fixture. Likewise, a toilet can't wet vent a lav or shower, but the shower or lav can wet vent the toilet.
     
  8. RiverLodge

    RiverLodge Member

    Joined:
    Oct 27, 2018
    Location:
    Paradise Valley, MT.
    OK Thanks. Just to confirm with this 3/4 bath schematic and knowing that the washer is upstream of the bathroom group.

    Again, thanks in advance for your reply.

    RiverLodge
     

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