Waste in downstairs loo from upstairs

Discussion in 'Plumbers' Talk' started by Jacko23, Jul 11, 2020.

  1. Jacko23

    Jacko23 New Member

    Hello

    The new upstairs loo has been plumbed into the downstairs soil pipe.

    Often we are getting some of the waste from upstairs make a journey into the downstairs loo. Not ideal.

    I have just moved where the pipe enters the existing pipe by 30cm down stream and this has not helped much. (Originaly they plumbed it right by the wall entrance).

    I cant see how i can do much else, any ideas?? Thanks.
     

    Attached Files:

  2. FlyByNight

    FlyByNight Screwfix Select

    Two thoughts.

    Partial blockage in the waste pipe. OR

    As the upstairs flushes it pulls the water out of the downstairs and then it refills with waste water from above.

    What AAVs have you got installed
     
  3. Jacko23

    Jacko23 New Member


    - Just had the waste pipe off and all clear

    - There is a short vent pipe outside upstairs loo with a FloPast Air Admittance valve
     
  4. Timbo66

    Timbo66 Active Member

    That branch looks to be fitted the wrong way round.
     
    candoabitofmoststuff likes this.
  5. Who did that?! I hope it wasn't a "professional"
    The elbow from your downstairs cloakroom needs to be changed to a T and the diagonal pipe run from upstairs needs to be changed to two 90's as a start. Who knows what the rest of the pipewotk looks like.
    Come on, fessup, you dunnit, haven't you!
     
    Jacko23 likes this.
  6. terrymac

    terrymac Screwfix Select

    Change the branch T for a Y shape ,and increase the fall on the horizontal section of soil pipe.
     
    Jacko23 likes this.
  7. Timbo66

    Timbo66 Active Member

    First turn the branch round so the sweep is in the direction of flow. That may solve the problem.
    If not, time for more major operations as above.
     
    Jacko23 likes this.
  8. Jacko23

    Jacko23 New Member

    Yes that will be my first step, thought it was backward but didnt think someone would do that.
     

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