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Thread: Does this layout work best?

  1. #1
    DIY Junior Member mnzpasquale's Avatar
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    Default Does this layout work best?

    Would like some opinions on layout...does that wet vent seem good for wc ?... There is nothing else on that 2" vent line, it goes straight up and out roof.
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    In the Trades Wally Hays's Avatar
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    Any vent is good for a WC. the lay out is fine.
    Perception is 3/4 of reality

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    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by mnzpasquale View Post
    Would like some opinions on layout...does that wet vent seem good for wc ?... There is nothing else on that 2" vent line, it goes straight up and out roof.
    That would be the industries a-typical wet vent for a toilet right there.

  4. #4
    DIY Junior Member bengal21's Avatar
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    Would it be acceptable under UPC to have a washing machine in the location of the sink as long as the drain line is 2"? Isn't the drain line for the sink considered a "wet vent" for the toilet and aren't horizontal wet vents not allowed unless they're 6" above the fixture it's serving?

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    Forum Admin, Expert Plumber Terry's Avatar
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    A wet vent needs to be bigger then the existing drain line for it to work. Since the washer is a required 2", then no, you could not wet vent the toilet with the washer 2".

    Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of one (1) and two (2) fixture unit fixtures that also serves as a vent not exceeding four (4) fixtures.

    Each wet vented section shall not be less then on (1) pipe size exceeding the required minimum waste pipe size of the upper fixture or shall be one (1) pipe size for the sum of the fixture units served by such wet vented section, whichever is larger, bu in no case less then two (2) inches.

    Horizontal wet venting is allowed for "bathroom" sets.
    No mention of a washing machine being allowed.
    Last edited by Terry; 07-19-2010 at 11:07 AM.

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    DIY Junior Member bengal21's Avatar
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    Quote Originally Posted by Terry View Post
    A wet vent needs to be bigger then the existing drainline for it to work. Since the washer is a required 2", then no, you could not wet vent the toilet with the washer 2".
    So if the drain line were 3" it would be acceptable? Would you run 3" up to where the trap arm of the washing machine connects and use a tee with 2" reducers for the vent and trap arm?

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    Forum Admin, Expert Plumber Terry's Avatar
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    In Washington State, you can't wet vent the washer over a bathroom set.

    We're talking maybe $15 worth of pipe and fittings you're trying to save.

    Horizontal wet venting is allowed for "bathroom" sets.
    No mention of a washing machine being allowed.

    If it's my house, and knowing what I know about washer drains, I wouldn't even consider putting the washer down a wet vent section.
    Last edited by Terry; 07-19-2010 at 11:12 AM.

  8. #8
    DIY Junior Member bengal21's Avatar
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    Quote Originally Posted by Terry View Post
    In Washington State, you can't wet vent the washer over a bathroom set.

    We're talking maybe $15 worth of pipe and fittings you're trying to save.

    Horizontal wet venting is allowed for "bathroom" sets.
    No mention of a washing machine being allowed.

    If it's my house, and knowing what I know about washer drains, I wouldn't even consider putting the washer down a wet vent section.
    So, pretending the sink is the place where a washing machine is being installed, How would you install the drain piping while also trying to vent the toilet? Two seperate lines until they meet a perpindicular lateral (not shown in drawing above) each vented on their own?
    Last edited by bengal21; 07-19-2010 at 02:10 PM.

  9. #9
    In the Trades Wally Hays's Avatar
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    You are only allowed to wet vent bath groups. Bath groups are defined as lav, toilet and shower or tub. Washing machines may not be wet vented under any circumstance.
    Perception is 3/4 of reality

  10. #10
    Forum Admin, Expert Plumber Terry's Avatar
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    The washer drain should come up seperate, as should the vent for the toilet. The revent can be at 42" above the floor.
    The washer waste would have to be downstream of the vent for the toilet.

    Suds control is one more thing to consider. Having the washer waste downstream helps with suds control.
    Have you ever seen soap suds come out from under a toilet?

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