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Thread: This one may require an asprin

  1. #1

    Default This one may require an asprin

    House built in 1940 with full bathroom on 1st floor. By your descriptions this is a wet vent system. It appears many years ago the 2nd floor bathroom (toilet, sink and closet where the tub would go) was added. I'm in the middle of gutting the 2nd floor bath to update it and add a tiled shower. I see now that the toilet and sink drain into the vent stack. Aside from moving a door and converting it into a walk-in closet, what can I do? I'm guessing I have to find a way to drop another 3" pipe to the basement to connect the toilet shower and sink.

  2. #2
    Master Plumber master plumber mark's Avatar
    Join Date
    Feb 2005
    indianapolis indiana - land of the free, home of the brave....
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    Talking lt sleeping dogs lie

    if this is how you found the bathroom

    and it has worked fine since 1940

    I suggest that you leave it as you found it.....

    an extra shower is not going to make a difference...

    let sleeping dogs lie....

  3. #3

    Default Fingers crossed

    Thanks. I guess the other professionals are agreeing with you. We have a cesspool and went our first 6 yrs. here without having it pumped. It was less than half full so that seems to be still working great!

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default drain

    When we did second floor additions, we cut the vent off from the stack and capped it. Then we extended the vent up to a point 42" above the second story's floor line. This will not work, however if the existing lavatory drain is connected to the vent stack, rather than having its own riser pipe with a separate vent connection to the stack.

  5. #5

    Default Hj

    I'm sorry. I guess I'm not understanding. The house is a cape cod and my main stack/vent is in about 6' from the back wall of the house. Non of the traps on the 1st floor are "vented" individually. Wet vent system, right? It looks like they put a wye in stack under the 2nd floor to run to the back wall and then up and out the newer roof. The toilet is over that pipe at the back wall. Where the wye is, the horizonal run is reduced (in the wall) to 2" and does a 90 approx. 2' off the floor and runs in the wall about 2' and is used as a drain for the sink.
    I'm planning on building a shower wall and put the sink on the other side of that wall with supply lines and drain in that wall. The drain for shower and sink would run to the 3" the toilet is on and run the vent to the old sink drain. Will that work?

  6. #6


    bumpity - bump


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