Venting Bathroom and Laundry Rooms - Unnecessary Vents?

Discussion in 'IPC Plumbing Code Questions' started by Scott Yackley, Jul 13, 2020.

  1. Scott Yackley

    Scott Yackley New Member

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    Are the vent lines questioned in the picture necessary? Was thinking that these fixtures are all vented thru the main stack or wet vented from other fixtures.
     

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  2. Reach4

    Reach4 Well-Known Member

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    Shower could be wet vented by making the lav drain go horizontal on the same level as the shower trap arm. I think that would be true for UPC and IPC.
     
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  4. Terry

    Terry Administrator Staff Member

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    If the shower arm was on the same plane as the line to the lav, then the lav would vent. But since you raised that line up with a 90 bend, it now needs it's own vent.

    The washer should keep it's vent.

    The laundry tray can vent using the main vent stack.

    The toilet should not drop into a santee. The waste that lands into a tee on it's back will spread both ways.
     
  5. Scott Yackley

    Scott Yackley New Member

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    Thanks for the feedback. Here is an updated diagram. The toilet drops into a 4"x3" closet bend. Does the toilet drain still need a vent line, or can it vent to main vent stack?
     

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  6. Reach4

    Reach4 Well-Known Member

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    I think you need that toilet vent. If the tub and shower drainage joined the toilet flow before the big pipe, that would wet vent the toilet. But with your layout, the separate vent looks easier.

    Elbow below lavatory needs to be a long sweep. Toilet and standpipe vent bottoms should be combos (combines 45+wye).

    Standpipe and its trap are 2 inch.
     
  7. Scott Yackley

    Scott Yackley New Member

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    Adjustments made. Agree, would be more challenging to tie the tub and shower into the toilet drain line. Thanks!
     

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  8. Terry

    Terry Administrator Staff Member

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    That looks awesome! :)

    [​IMG]
     
  9. DavidDeBord

    DavidDeBord Member

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    Per the 2018 IPC, an "Exception" is given:

    Each fixture trap shall have a protecting vent located so that the slope and the developed length in the fixture drain from the trap weir to the vent fitting are within the requirements set forth in Table 909.1.

    Exception: The developed length of the fixture drain from the trap weir to the vent fitting for self-siphoning fixtures, such as water closets, shall not be limited.

    Is venting the toilet "run" required due to it's change of direction?
     
  10. DavidDeBord

    DavidDeBord Member

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    Ok,... It's been ten days with no input,.... is there a source herein the group, with schematics?, notes?, Tips? related to this installation & my question?
     
  11. Tuttles Revenge

    Tuttles Revenge In the Trades

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    I think you aren't getting a response because you tacked on your question onto someone elses Thread. Post a new topic of your own and you will get a better response. as is, it just looks like you're adding to the above conversation. I'm not familiar enough with the IPC to give a qualified answer otherwise I would.
     
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  12. Reach4

    Reach4 Well-Known Member

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    I think it was because I wondered what he was up to. The actual question seemed weird.
     
  13. DavidDeBord

    DavidDeBord Member

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    Ya'll, I was speaking of the Finished diagram above.

    I was under the impression that the run for the toilet didn't require a vent.
     
  14. wwhitney

    wwhitney Well-Known Member

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    The WC always needs a vent. Often you can wet vent it, so it doesn't have to be a dry vent. But in this case that won't work:

    The details depend a little on plumbing code. The OP is in MI, which uses the UPC, which requires a vent within 6'. If the run to the stack is over 6', then the dry vent is required for that reason (the bend doesn't matter). Even if under 6', the UPC restricts vertical wet venting to stacks receiving the discharge of 1 and 2 DFU fixtures, but the washing machine standpipe is a 3 DFU fixture, so the dry vent is required. [The laundry standpipe dry vent could be eliminated, as the laundry sink is a 2 DFU fixture, so its vent can wet vent the laundry standpipe, since the stack is already upsized from the minimum laundry sink drain size.]

    The IPC has no limit on the length of the WC fixture drain, but it limits vertical wet venting to bathroom group fixtures, so not for a laundry sink or laundry standpipe. It does allow vertical common venting of any two fixtures, but that doesn't apply to the WC, as it has two fixtures above it. [Although again, the laundry standpipe dry vent could be eliminated, so the standpipe is common vented with the laundry sink.]

    Cheers, Wayne

    Edit: oops, I mixed up my Midwest states, MI (Michigan) is IPC, MN (Minnesota) is UPC.
     
    Last edited: Jan 15, 2021
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