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  1. #1
    Join Date
    Jul 2009
    Location
    Washington state
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    134

    Default Another vent question

    We're planning on adding a below-grade bathroom. Luckily the plumbing is all accessible.

    The P-trap for the upstairs bathtub is attached to the top of a 2inch vertical pipe. The end going thru the ceiling (first floor subfloor) is presumably a vent. The other end drops about 18" and is attached to the outflow pipe.

    Can we move the P-trap down about a foot or so in order to add vents for the new basement fixtures above it? Is that a bad idea?

    Thanks!

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
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    5,441

    Default Re: Another vent question

    Is there any way you can attach photos?

  3. #3
    Join Date
    Feb 2010
    Location
    South*East
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    1,183

    Default Re: Another vent question

    You can not connect to the vent in the basement. It must connect above the floor rim of the fixture. That being 42" above the bathroom floor. If you connect to the tub vent in the basement and the tub drain should become plugged the waste water would run down the vent for the basement fixtures.

    John

  4. #4
    Join Date
    Jul 2009
    Location
    Washington state
    Posts
    134

    Default Re: Another vent question

    Sorry, can't post pics.

    I see what you mean about the possibility of a clog in the tub plumbing forcing water up to the basement fixtures vents. Had't thought about that.

    Is it OK to run a new vent pipe next to the existing one, provided there's room? It would run through the same wall upstairs that the existing one does.

  5. #5
    Join Date
    Feb 2010
    Location
    South*East
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    1,183

    Default Re: Another vent question

    That would be the way to do it. You can connect it to the tub vent but it must be 6" above the flood rim of the fixture.

    John

  6. #6
    Join Date
    Jul 2009
    Location
    Washington state
    Posts
    134

    Default Re: Another vent question

    Just make sure I get this.. the P-trap and vent I'm talking about is for the first floor tub. The bathroom sink vent must be 42" above the top rim of the sink. So I could use the existing vent if I can tie in at about 78" inches from the basement floor?

    Sorry to be so dense.

  7. #7
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,183

    Default Re: Another vent question

    The vent must tie in 42" above the first floor. By first floor I don't mean the basement floor. If the basement ceiling is 8' then the vent has to tie in at 8'-42" above the basement floor. I don't understand were your getting 78" from.

    John

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