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Thread: basement plumbing help

  1. #1
    DIY Junior Member
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    Default basement plumbing help

    A month or so ago I moved my washing machine from my basement to my top floor and everything came out great.

    I am now thinking of putting in a sink and toilet in the basement where the washing machine was. Unfortunately, I thought this would be much easier until I found the "vent" for the washing machine going into the ceiling wasn't connected to anything - the previous plumber just faked it to pass inspection. I've attached a sketch of what I want to do in the basement. Unfortunately the main stack is located behind the wall in my tenants apartment and I can't start breaking up his finished floor or walls in his apartment - don't mind breaking anything on my side. Coming out of the floor where the washing machine is connected, there is a 3" PVC pipe with a red fitting on it to accept the 2" drain for the washing machine coming down from the top floor. I am assuming that the 3" pvc runs to the 4" drain somewhere beneath my slab - the wife is going to love me with all the concrete breaking about to happen. In any case, since I can't run a vent to the roof now - not without breaking up a TON of stuff - I was hoping I could use an AAV. If someone could look at my awful drawing and offer any suggestions I would be very appreciative. I am assuming of course that under no circumstances can I run a vent out of the side of my hosue??

    Thank you!!! Love this Forum - been reading for years first time posting - a ton of good info here!
    Matt
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  2. #2
    Plumber krow's Avatar
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    Quote Originally Posted by mazzonetv View Post
    . I am assuming of course that under no circumstances can I run a vent out of the side of my hosue??
    Why not? The pipe going to the exterior of the house needs to go out on a 45 degree angle and minimum 3" diameter. Run it up the side of the house to the roof line and your good to go

  3. #3
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    Really not crazy about the look of a 3" PVC pipe running up the outside of my house. I know here in NY I've seen plumbing vents coming out the side of the building, but have no clue what the codes were or are regarding that - I'll have to check with a local plumber or building inspector. What about using the AAV? Would that be OK ? In either case - if I do the work myself or hire a plumber just want to make sure it is done right..

    Thank you!

  4. #4
    Plumbing Designer FloridaOrange's Avatar
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    Local codes here allow you to terminate with a sidewall vent but you must be 10' minimum above grade and not below an open soffit or operable window.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  5. #5
    Test, Don't Guess! cacher_chick's Avatar
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    Also consider that the vent line can be run through a different wall in the house- it does not have to be the wall right at the fixture.

  6. #6
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    Thank you for the info. After looking at this again last night I am going to run a 2" vent from the basement up to the attic - found a pretty good spot to do it - only have to break up two walls - one of them the wife wants painted anyway =)

    After doing a little more research it looks like I should vent the toilet however - which I did not include in my sketch. Assuming I use a 3x2 wye under the flange - or a heel fitting - and run the 2" into the wall cavity and tie the 1-1/2" vent from the sink into that - will that be ok. I'll then run the 2" up 2 stories into the attic and either go through the roof with a new 3" vent or tie into my existing vent in the attic.

    Thank you all!!!

  7. #7
    Plumbing Designer FloridaOrange's Avatar
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    If you are allowed to wet vent the toilet would be vented by the lavatory.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  8. #8
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    Would it make more sense to do it this way. Your help is much appreciated!
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  9. #9
    Plumbing Designer FloridaOrange's Avatar
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    What's the extra 3" all the way to the right.

    I would run the 3" to the closet flange. Branch off of that 3" with a 2" to the sink. 2" vent up from the sink.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  10. #10
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    The extra 3" to the right is where my old washing machine was hooked up to. It is now picking up the washing machine from the top floor - so it is still in use. The toal span from where that 3" comes up through the floor to where the vanity will be is about 10'.

    Thank you for such a quick reply...

    Matt

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