Requesting review of mechanical vents for new 2nd floor bathroom - with photos

Discussion in 'Shower & Bathtub Forum & Blog' started by BPGOG, Mar 18, 2017 at 10:49 PM.

  1. BPGOG

    BPGOG New Member

    Joined:
    Apr 7, 2016
    Location:
    Rhode Island
    I am trying to add a second bathroom to my house without adding a vent through the roof. The 1 and only existing bath on other corner of house has a vent through roof. I want to connect to drains in basement, so have shower, toilet, sink, joining together in 3" drain, then dropping vertically for 8 ft to get to the basement. My worry was adding the shower downstream from the toilet that it would put positive pressure on the shower P trap when the toilet flushed and the slug of water was approaching the shower Tee. I added a AAV (mechanical valve) to the shower after the P trap so it wouldn't suck dry. Was going to do heel inlet on the 3" elbow below the toilet, but worried about backflow..

    thoughts, suggests? Is this good as is? I'm ready to glue it.


    20170318_210218.jpg 20170318_210315.jpg 20170318_210337.jpg

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  2. BPGOG

    BPGOG New Member

    Joined:
    Apr 7, 2016
    Location:
    Rhode Island
    photos showing vanity into toilet drain, then shower into 3", with additional mechanical vent between shower P trap and 3" main drain.
     

    Attached Files:

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  4. cacher_chick

    cacher_chick Test, Don't Guess!

    Joined:
    Jan 5, 2008
    Occupation:
    Test, Don't Guess!
    Location:
    Land of Cheese
    I cannot see in your photo where the vents are.

    We would not be allowed to use an AAV for a build where a proper vent could be installed on a new build such as yours.

    If you had to use AAV's, you should still follow the basic rules for venting. The shower vent must be in the trap arm of the shower drain, and it must rise vertically to a point no less than 42" above the floor. If the WC is being wet vented through the sink vent, that vent should follow the same rule. The AAV's can be in the walls, but they must be left accessible by way of an access or vent cover.
     
  5. BPGOG

    BPGOG New Member

    Joined:
    Apr 7, 2016
    Location:
    Rhode Island
    Thanks for taking a look. I reconfigured the shower drain so it goes right to the AAV vent pipe, then turns a 180 and flows into the 3" toilet drain. Photos from yesterday's install plumb photo 1 3 20.png.jpg plumb photo 2 3 20.png.jpg
     
  6. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    The inspector would like to see the shower vent to vertical with a wye or combe fitting in case someone uses that as a future wet vent, but I do like that you have that.
    The AAV's need to get air and be accesible. They make a box with grill for that which looks very nice.
    The lav AAV can be under the cabinet.
     
  7. BPGOG

    BPGOG New Member

    Joined:
    Apr 7, 2016
    Location:
    Rhode Island
    Thanks Terry for the note. The shower AAV goes up 42" into the new wall I built as shown in early thumbnail photo. Yes, sink cabinet has P trap into vertical pipe with AAV on top.

    thanks!
     
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