Basement Plumbing Rough In

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Muzzlehead, Feb 11, 2010.

  1. Muzzlehead

    Muzzlehead New Member

    Joined:
    Feb 11, 2010
    Location:
    Fortress Muzzlehead
    I am tying into a 4" Cast Iron soil line running under my concrete slab. The soil stack serves an additional bathroom (8 FU) located on the first floor and vents out the attic through 3" galvanized steel.

    Questions:

    1) Overall plan; any problems?

    2) Should I vent to the attic with a 3” or will the 2” suffice (easier to get into wall). I have two 2” vents tying together above the vanity and running from there to attic.

    3) Is there a max distance for the trap off the shower? I would like to set a clean out over the far end of the trap just behind the toilet in the floor.

    4) Do I need an additional clean out after the toilet/tub junction?


    Black line = Soil Stack
    Green line = new branch; solid and dotted is 4” single green 2”
    Red line = Vent; all vent 2”, tub vent ties to sink vent <6” above sink and runs to attic to tie into main
    Soil stack 3” vent

    All angles on DVW are sanitary T or 45 degree angle
    All vent angles are sanitary T or 90- degree angle

    All pipe run at @ ¼ inch grade toward main soil stack; 2” DVW ties to 4” branch at 45 degree angle with sanitary t

    Helpful Plumbing Hints for Residential Construction by Bert Polk Plumbing Inspector Lincoln County



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    Last edited by a moderator: Sep 19, 2021
  2. Cass

    Cass Plumber

    Joined:
    Nov 12, 2005
    Location:
    Ohio
    Last edited by a moderator: Sep 19, 2021
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  4. Muzzlehead

    Muzzlehead New Member

    Joined:
    Feb 11, 2010
    Location:
    Fortress Muzzlehead
    Last edited: Feb 13, 2010
  5. cacher_chick

    cacher_chick Test, Don't Guess!

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    Test, Don't Guess!
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    Land of Cheese
    A vent will accomplish nothing if it is not installed "downstream" from the fixtures trap.
     
  6. Muzzlehead

    Muzzlehead New Member

    Joined:
    Feb 11, 2010
    Location:
    Fortress Muzzlehead
    The picture of the basement with comments above is my latest plumbing layout; I removed the previous pictures to limit confusion as they were incorrect.

    Any thoughts?
     
  7. cacher_chick

    cacher_chick Test, Don't Guess!

    Joined:
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    Occupation:
    Test, Don't Guess!
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    Looks better. I would re-vent the lav even though it might be a short enough branch to not be required. I would install cleanouts a there and on the stack.
    1/4 bend at the lav must be a long turn. Can't use a 1/4 bend under the floor but 1/16 or 1/8 bends ok. A wye & 1/8 bend combo should do it for you.

    Hopefully one of the pro's will pipe in to verify. There may be some discrepancy depending on what code you fall under and local codes. You should pull a permit so there are no surprises down the road. For instance, some areas must use cast iron below grade.
     
  8. jc60618

    jc60618 DIY Junior Member

    Joined:
    Dec 12, 2009
    Occupation:
    Apprentice Plumber
    Location:
    Chicago
    It will be wise to bump out that tub wall. By bumping the wall out you will have more play for your overflow and valve. Also consider using a 2x6 for your plumbing wall it will give you more room for the water piping. If you dont want to use a 2x6 put that 2x4 bottom plate 5 inches from the wall and run your plumbing in the chase. By doing this you wont have to drill out for your stub ups. Below is how I would have done it hope it helps.
     

    Attached Files:

    Last edited: Feb 13, 2010
  9. nhmaster

    nhmaster Master Plumber

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    Jul 30, 2008
    Occupation:
    Tech. Instructor
    Location:
    S. Maine
    The only vent you need there is the one off the lav and make sure it is 2" from the san tee down.
     
  10. Muzzlehead

    Muzzlehead New Member

    Joined:
    Feb 11, 2010
    Location:
    Fortress Muzzlehead
    Thanks guys these comments were very helpful. I am banging on concrete now.

    I will put a pic up of the 'dry run' layout once I have the wall built and stack run.

    I'll keep you all posted, thanks again!
     
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