Another 2nd WC into branch question!

Discussion in 'Plumbers' Talk' started by Deleted member 25896, Apr 19, 2015.

  1. I too want to add a WC to the en-suite which is next door to the bathroom. So, if you were looking through the bathroom door at the back of the house the vented soil stack is in the right hand corner, I want to run about 1.2m of 4" under the floor (the 8" joists run the right way) to a T which connects to the bathroom WC and then about 800mm of 4" to a swept elbow for the ensuite WC just the other side of the wall. As both pans will be dropping vertically down into the 4" soil it never occurred to me that there could be an issue until I read the other post! Are there any issues? Cheers!
     
  2. Dave does Gas

    Dave does Gas Screwfix Select

    Think you will need to put up a diagram so as everyone is clear about you intentions
     
  3. Well I wouldn't have a clue how to do that Dave!
    Anyway I'm doing the job on Weds so if it doesn't work and I go bankrupt I'll be sure to let you all know!!
     
  4. Phil the Paver

    Phil the Paver Screwfix Select

    If your running the two pipes into one stack as separate pipes then it shouldn't be a problem, the other post I think your talking about was two wcs on one pipe that went to the stack, in that case a AAV needs to be fitted to stop vacuum suction emptying the trap on one of the wcs when the other is flushed.
     
  5. KIAB

    KIAB Super Member

  6. KIAB

    KIAB Super Member

  7. No it's two WC's into one branch. Do you think I could get away with a 50mm AAV as I could hide that within the stud wall?
     
  8. KIAB

    KIAB Super Member

    Usually it's 82mm minimum used on stacks, wouldn't like to commit myself to say 50mm would be ok.
    Just had a look at FloPlast AAV info,linky below, you ain't going to get the required airflow.

    http://www.ribaproductselector.com/Docs/5/12945/external/COL912945.pdf
     
  9. Thanks KIAB. I'm not going to risk it so will build a box behind WC and fit a 4" stack and Dirgo.
    Cheers all.
     

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