Why vent toilet through sink?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Ted cark, Oct 19, 2021.

  1. Ted cark

    Ted cark New Member

    Joined:
    Oct 19, 2021
    Location:
    British Columbia
    Why not just vent through main vent? Is it because toilet is usually more than six feet from main vent.

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  2. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    In the diagram below, either the left or the right are plausible. The US plumbing codes (which vary by state) regulate the length of the red line (the lav trap arm), and some of them regulate the length of the green line (the WC fixture drain up to its vent). So the advantage of the left is just that those distances are shorter in that diagram and the right may not meet the requirements.

    Cheers, Wayne


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  4. Ted cark

    Ted cark New Member

    Joined:
    Oct 19, 2021
    Location:
    British Columbia
    Thanks
     
  5. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    And you can wet vent a toilet and tub or shower thru the sink
     
  6. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    AWFUL VENTING . the installer obviously had no formal education and looked at how cheap he /she could do the job

    A "WET VENT" becomes reduced over the years by soap scum and other debris that reduces the flow and vent capacity as the inside diameter is reduced.

    Ideally a vent shall be placed with in 2 feet of a trap and the trap with in 2 feet of the fixture
     
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