A venting dilemma

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by basmoq7, Feb 13, 2020.

  1. basmoq7

    basmoq7 New Member

    Joined:
    Feb 13, 2020
    Location:
    Indiana
    Screenshot_20200213-175728_Photos.jpg
    Hi all, I have a basement unfinished room I'd like to add a shower to. I'll raise the floor to accommodate the shower pan drain. What I'm having difficulty with is determining how to properly vent the shower.

    My options are:
    • A- I use the vertical pipe shown as my vent. It goes to the kitchen sink upstairs and is vented just a foot past the sink's P-trap.
    • B- I run a vent up the wall about a foot before the shower drain enters the double fixture tee. This vent would go up where the current sink drain is located and tie into the vent pipe over the bathroom ceiling just behind that electrical panel (very difficult to gain access to that location...). This also would require bringing the sink drain down from an alternate location as it is in the way of venting.
    Is option A acceptable?
     
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The kitchen sink upstairs is not a vent. Any vent from the downstairs would need to tie in at 42" above the second floor, which is six inches above the 36" high countertop upstairs.

    Or you could plan on using an AAV for the venting downstairs.
    It needs to be accessible for replacement when it fails and not be closed in. It needs access to air.

    [​IMG]
     
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  4. basmoq7

    basmoq7 New Member

    Joined:
    Feb 13, 2020
    Location:
    Indiana
    Screenshot_20200213-193329_Photos.jpg

    Wow, quick reply! Thanks Terry!

    One followup question.

    Could I relocate the kitchen sink drain to the blue line. Then I'd run a vent line for the shower up over the existing bathroom ceiling where it would tie into the vent servicing the sink/toilet? (Yellow line). I am because I'm specifically concerned about the vent pipe being so close to the drain. Want certain if that would cause a conflict. I don't want to use an air admittance valve simply because no one ever looks at them after install...
     
    Last edited: Feb 18, 2020
  5. basmoq7

    basmoq7 New Member

    Joined:
    Feb 13, 2020
    Location:
    Indiana
    Bump to the top for hopefully an answer?
     
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