Does this layout work best?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by mnzpasquale, Jul 16, 2010.

  1. mnzpasquale

    mnzpasquale New Member

    Messages:
    8
    Location:
    New York
    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.

    Attached Files:

  2. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    Any vent is good for a WC. the lay out is fine.
  3. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Messages:
    810
    Location:
    Penticton, BC
    That would be the industries a-typical wet vent for a toilet right there.
  4. bengal21

    bengal21 New Member

    Messages:
    21
    Location:
    Des Moines
    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?
  5. Terry

    Terry Administrator Staff Member

    Messages:
    14,889
    Location:
    Bothell, Washington
    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: Jul 19, 2010
  6. bengal21

    bengal21 New Member

    Messages:
    21
    Location:
    Des Moines
    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?
  7. Terry

    Terry Administrator Staff Member

    Messages:
    14,889
    Location:
    Bothell, Washington
    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: Jul 19, 2010
  8. bengal21

    bengal21 New Member

    Messages:
    21
    Location:
    Des Moines
    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: Jul 19, 2010
  9. nhmaster3015

    nhmaster3015 Master Plumber

    Messages:
    836
    Location:
    The granite state
    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.
  10. Terry

    Terry Administrator Staff Member

    Messages:
    14,889
    Location:
    Bothell, Washington
    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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