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Thread: Basment Bathtub vent question

  1. #1
    DIY Junior Member jsmithv's Avatar
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    Default Basment Bathtub vent question

    I am working on my basement bathroom, and very new to this stuff, but i'm stuck thinking about the venting options for the tub. I have a couple questions and I've attached a quick drawing of what I have.

    1. Is the tub line already vented perhaps along with the toilet stubout, or not?
    2. Can i tie the wetbar drain into the same drain as the vanity? I have the wetbar sink venting with an AAV which is permitted in my area, so I don't need to worry about venting that.
    3. If the 2" line under the concrete does need its own vent, how can I tie into the 1.5" vent stack that's there? The wetbar drain line in in the 2x4 wall, so I can't go around it and up into the vent line?

    Or perhaps I should drain the wetbar line and the tub both into the 2" tub drain and that will clear a path to get to the vent? Any thought would be appreciated. Thanks in advance,

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    Hopefully the pipe coming out of the floor to the lav is 2", because a 1-1/2 should not be run underground.
    If so, the 2" shower/tub drain and the toilet MIGHT be wet vented through the lavatory.

    Finding out how is was installed is a problem. If you cannot confirm the original installation through the builder, you might have to open up the floor to see what is there.

  3. #3
    DIY Junior Member jsmithv's Avatar
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    Yes, where it comes out of the floor it's 2"; it reduces to 1.5" at the cleanout. I should have noted that dimension on my drawing. Is there a way to test if its wet vented without digging all the concrete up? e.g. put a ptrap in the hole and pour water down? If its vented properly i would think the water would pour through without issue. If not, wouldn't I see it trying to gulp air through the ptrap and maybe smell sewer? Maybe that's a stupid question.

    Maybe I'm better off just to vent the tub line anyways? The room next to this, behind the wall with the pipe in it, is my mechanical room. I guess I could just pipe through there into the vent or use an aav...

  4. #4
    Test, Don't Guess! cacher_chick's Avatar
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    You could have a plumber run a camera down the lines to see how the connections are made, I couldn't say for sure what he might be able to see with the camera without trying it.
    Last edited by cacher_chick; 02-25-2011 at 04:13 PM.

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