Basement Rough-In Critique

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by saffron98, Jul 12, 2017.

  1. saffron98

    saffron98 New Member

    Jul 12, 2017
    Westchester NY
    Let me know your thoughts on on this basement in slab rough in.
    Total run from toilet flange to SDR pipe at garage entrance is 34'
    Plumbed in 2" and 4"
    1/8" Pitch on 4" Pipe
    1/4"+ Pitch on 2" Pipe
    Last edited by a moderator: Nov 12, 2021
  2. dgeist

    dgeist Member

    Apr 11, 2009
    Hi. Do you know what code you're trying to meet? it might change the answers. I'm, not a plumber, just DIYer, but here's what I see:

    - You might need a clean-out on the line from the second floor bath based on the directional change. Ask the AHJ.
    - It looks like you have a sealed sump pit. you might want to plumb in a vent for it to avoid straining the seal when it operates.
    - Vents should be rolled at 45 degrees from the horizontal and stay at least that pitch until they're above the spill line of all the served fixtures (i.e. can't go horizontal till around 42" up). If you can get them near the walls, you can "cheat" normal clearances with gaps behind tubs, notching the bottom plates of your 2x walls, etc.

    I'm dealing with similar questions in my basement remodel and have found that keeping the drain lines near usable wall cavities makes getting proper venting in place MUCH easier. Do you have any planned partition walls that you can leverage to get your vents up and over?

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  4. saffron98

    saffron98 New Member

    Jul 12, 2017
    Westchester NY
    I am trying to meet New York state plumbing code (IPC). Yes, the line from the 2nd floor bath will need a clean out installed.

    Does the shower need a dedicated vent or is the sink wet vent enough to vent the entire group? I understand there are strict requirements in terms of distance from the fixtures to the wet vent.
  5. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    The shower needs it's own vent. I would like to see the shower line go to the wall where you can place the vent vertical and they wye or 90 back for the trap. That removes the flat vent and gives you a legal vertical vent.

    Most places let you have up to three toilets on 3" and it gets bumped to 4" for the fourth.
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