foundation opening for plumbing

Discussion in 'Remodel Forum & Blog' started by lastguy, May 17, 2005.

  1. lastguy

    lastguy New Member

    Messages:
    1
    Hi,
    Does anybody know whether I can open in (E) foundation a 6" hole for 4" sewage pipe to go through? Any change in structure I need?
    Another question is that if I have an opening of 18Hx30W in (New) foundation wall, can I use it for 4" pipe to go through?
    I refer to city code allowance for foundations of a crawl space house, crawl space of 18" high.
    thanks a lot,
    Last edited: May 17, 2005
  2. jdkimes

    jdkimes Engineer

    Messages:
    181
    Location:
    Littleton, CO
    Not sure if Lastguy still needs an answer but, for the existing foundation I'd generally say that it's acceptable although if the hole cuts some re-bar it might be prudent to install some steel channel or plate above or below the hole extend 2-3ft on either side and fastened with 1/2"x 5" lag bolts to the foundation every 1ft.
    As for the pipe through the existing opening I'm confused about the question.
    Sounds like you want to run a pipe through a window
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,304
    Location:
    Cave Creek, Arizona
    hole

    You can break or drill a hole as necessary. As long as the pipe does not affect access to the crawl space you should be able to run the pipe through the opening.
  4. install a sleeve on the pipe.

    sometimes , depending on what this is going through , its also not a bad idea to install a larger section of pipe to make a sleeve for the pipe to go through...in this area its code to portect the pipe when going ito or out of a building,

    we have had inspectors wanting to see a 3 inch pvc pipe going through a sleeve to protect the line...

    it is not very hard to do. and if you are going out of a foundation into another section of room or underground to something,

    its very likely if they see it they will require a sleeve on the pipe....

    installing a sleeve after the work is done can really be a problem.
    Last edited: May 26, 2005
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