Basement bathroom--use shower vent for toilet

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Hammerlane, Feb 3, 2014.

  1. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    Planning stages of basement bathroom. Here is a photo of the corner area I have picked out.

    -The purple is the existing 4" running in the slab. The location is confirmed via camera.

    -That stack on the left of the photo is all vent pipe above the upper 4" San-T. So I can tie into that to vent this bath group.

    -The brown is the estimated framing.

    -You can see the location I want to put the toilet and lav. The shower will be a 36" x 60" in the corner where the shelving is.

    Here is a real photo of the basement.

    Attached Files:

  2. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    Here is a sketch of how Im thinking of setting the fixtures. Is it OK to use the shower drain as a wet vent for the toilet?


    -Purple is existing 4"
    -Gray will be 3" for toilet
    -Green will be 2" for shower and vent
    -Orange will be 1.5" for lav.

    The vent locations are shown in red circles.

    Attached Files:

    Last edited: Feb 4, 2014
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,263
    Location:
    Cave Creek, Arizona
    Yes, but you CANNOT connect to that "vent" unless you connect at least 6" above the overflow level of ANY fixtures connected to it, otherwise YOUR new vent will become a "secondary drain line" in the event of a stoppage. I am also dubious about it just being a vent, because if so, there is no reason for it to be there.
  4. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    Thanks hj... If you notice the 4" San-T going into the wall, that picks up two garage drains. I am 100% positive that there are no other fixtures draining into that stack above the 4" San-T. As a note, I am also positive that these garage floor drains and therefore this stack is draining into the sanitary city sewer and not the storm sewer.

    I have another 4" stack about 20 feet away in the basement and that one picks up all my 1st and 2nd floor fixtures(kitchen, laundry and 2.5 baths)

    This house isn't that old and I've always wondered why the builder couldn't spend the extra few dollars for some fittings to at least rough in a basement bathroom. Maybe that vent was his way of saying, "Here...at least I gave you and easy way to vent a basement bathroom" I dont know. Just my 2 cents.

    Attached Files:

    Last edited: Feb 4, 2014
  5. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    This is my other fixture location plan. Move the toilet over beside the lav and wet vent thru the lav.

    Attached Files:

    Last edited: Feb 4, 2014
  6. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    On another forum:

    It was suggested that I make only one tie-in to the main 4".

    I was quoted that per that according to Ohio Chapter 4101:3-9. Any combination of fixtures within a bathroom group located on the same floor level is permitted to be vented by a horizontal wet vent. Also each wet vented fixture drain shall connect independently to the horizontal wet vent. Would either one of the diagrams below(left or right) work.

    Its the last part, "Also each wet vented fixture drain shall connect independently to the horizontal wet vent" that i am having trouble interpreting. Would either one of the diagrams below(left or right) work.

    Essentially each drawing has one 3" branch off the main 4".

    In both drawings the lav is being used to wet vent the toilet and shower.

    To me the drawing on the right more meets the requirement of "each wet vented fixture drain shall connect independently to the horizontal wet vent".

    Thanks if you can offer any insight.

    Attached Files:

    Last edited: Feb 6, 2014
  7. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    getting ready to knockout this floor to rough-in this basement bath(toilet, lav and shower). I bought the shower base, 34x48 with a center drain. This is how I'm planning the below grade plumbing for the toilet and shower.

    -The lav will be plumbed above grade.

    -Pics show plumbing for toilet and shower

    -The purple line is the location of the existing 4" drain below grade

    Attached Files:

    Last edited: Oct 26, 2014
  8. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    floor opened up...
    Tip: dont rent the Makita electric concrete saw from HD with the shop vac attachment for dust collection and think its going to collect all the dust from cutting. Not even close.

    Attached Files:

  9. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    Got the rough in done. We also roughed in for a future laundry sink on the opposite side of the wall with the lav as seen in pictures 3 & 4.

    And yes we got a little sloppy with the primer

    Attached Files:

    Last edited: Nov 7, 2014
  10. hboogz

    hboogz Member

    Messages:
    42
    Location:
    New York
    great thread with great detailed pictures. Thanks hammerlane

    [​IMG]
    Last edited by a moderator: Nov 7, 2014
  11. rosem637

    rosem637 Member

    Messages:
    40
    Location:
    Michigan
    On your lav and laundry how high is the vent on the laundry before it goes horizontal and why are the studs on the "back" wall turned with their face out and not the edge. How do you plane to drywall with them like that?
  12. Hammerlane

    Hammerlane Member

    Messages:
    263
    Location:
    Ohio
    The vent goes horizontal at about 42". The studs on that back wall inside the shower alcove are positioned correctly because the shower base needs to be set far as back as possible. The other studs sling that back wall will be turned.
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