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Thread: DWV, Need Help

  1. #1

    Default DWV, Need Help

    I have just dug my trench and am proposing the following layout "attached the top view" of my DWV. Can experts please advise!!! Thx
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  2. #2
    Master Plumber Redwood's Avatar
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    I see a few problems...
    S-trap for shower.
    AAV venting laundry standpipe and shower.
    Shower on the same 2" line as the laundry standpipe...

    I would suggest revisiting the drawing board.
    Are you having this permitted and inspected?

  3. #3
    Plumbing Contractor C NUMB's Avatar
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    Good job on the layout, but I would use a 3x2 combo for the vent on the water closet and keep 3" up to the wye for shower and laundry connection and 3" to the base of the laundry stack. Also keep 2" for wm drain. Have done similar connections down my way way and if you can re-vent the laundry stack instead of the aav it would be more advisable.

    I'd Rather Be FISHIN'

  4. #4

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    Thx Redwood. I made a mistake in stating S Trap it is actually a P Trap without the clean-out. I have changed my mind with the AAV and decided to vent straight up and run to a nearby vent.

    Why is 2" not enough to run a sink and shower?

  5. #5
    Moderator & Master Plumber hj's Avatar
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    Default drains

    I read it as "lavatory", not "laundry", and 2" is adequate, if not preferable, for that usage. Where does the toilet vent go once it gets to the basement ceiling? IF there is a vent to connect to, why would you possibly cause yourself future problems by not connecting the lavatory/shower vent to it?

  6. #6

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    Thx C numb. I did have a 3X2 vent for my closet drain (unless I misunderstood?) I will definetly remove the AAV.

    Also is 1/8th the same as 45 degrees?

  7. #7
    Plumbing Contractor C NUMB's Avatar
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    My bad, I thought it said laundry. 2" would be fine for sink and shower.

    Yes on the 45
    Last edited by C NUMB; 01-25-2009 at 07:52 AM. Reason: added text
    I'd Rather Be FISHIN'

  8. #8

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    HJ

    Thank You. I am assuming that you are saying my original design with 2" will accommodate shower and sink.

    The toilet vent gets connected to a 11/2" vent straight above it which vents the powder room above(mainfloor) and then continues to go up and eventually through the roof.

    The reason I was going to use AAV on the shower sink was that the vent although only 7 ft (as th crow flies) to the toilet vent, I would go aginst the joists and did not want to build a bulkhead. The only way for me to tap into it would be an 8ft run parallel to the joist into a nearby bulkhead then back across the joists 7ft and tap into then. AAV or this????

  9. #9
    Master Plumber Redwood's Avatar
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    My bad on reading laundry.
    Damn small print... I guess the eyes are shot!

    Okay lav wet venting the shower is fine.

    Good idea on reventing the lav instead of using an AAV.

  10. #10
    Master Plumber nhmaster's Avatar
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    You can wet vent the entire bath group through the lav. The toilet doesn't need a vent.

  11. #11

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    Thx NH Master.

    This is true even with the long run?

    Just so I understand......Remove the 3x3x2" next to the closet flange?

  12. #12
    Master Plumber nhmaster's Avatar
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    IPC will let you run "unlimited" distance from toilet to vent. All the other fixtures have to be within limits depending on pipe size.

  13. #13

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    So back to my sink and toilet. Should I use the AAV or is the run of roughly 15 feet okay?

  14. #14
    Plumbing Contractor C NUMB's Avatar
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    Updated drawing for you



    Good luck with the project
    I'd Rather Be FISHIN'

  15. #15

    Default

    C Numb. Thx but nothing attached

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