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Discuss Leaking Soil Stack ! in the Plumbing Forum area at

  1. Monkey Wrench

    Monkey Wrench New Member

    I've attached a picture below of a leaking PVC soil stack that needs to be repaired. As can be seen, the leak is coming from the bottom of the stack from what
    appears to be a socket ! My first inclination was to cut a small section ( about 3 inches) out of the stack about two feet up from the leak and then pull the
    lower part of the stack out in order to see the best way of making the repair.

    There is a horizontal branch (for a toilet) about 8 feet up from the ground that goes directly into the house so this should support the upper part of the stack
    while the repair is done. However, once the repair is made, a slip coupling would have to be placed over the cut segment of pipe but this would then obviously
    not give any support to the upper half of the stack !

    Removing the stack completely to make the repair would be a nightmare because of the horizontal branch going back directly into the wall for the WC.

    Any advice would be appreciated.

    Thank you.

  2. TBServices

    TBServices Guest

    Would be easier as a two man job, one to loosen and lift the top half of the stack, and one to slip in the new section of pipe. You may have to lift the top half of the stack up, pull the tee off the horizontal branch then start from the bottom again.

    Sent from my iPad using Tapatalk HD
  3. Monkey Wrench

    Monkey Wrench New Member

    Thanks for the response TBServices.

    The tee is turned back directly to the wall and the branch is cemented straight into the wall. If the top of the stack was lifted up out of the tee there would still be no way of removing
    the bottom part of the stack from the tee as the tee is fixed directly into the wall with no movement available.

    Thanks again.
  4. TBServices

    TBServices Guest

    Oh I see! Well in that case it seems you're out of luck. Short of taking it all down I can't see another way of doing it right. Maybe someone else will have an idea

    Sent from my iPad using Tapatalk HD
  5. WaterTight

    WaterTight Plumber

    Bashing out a bit of concrete and making good on the outside won't be too much of a problem if you need to remove WC branch too. It's all down to how much of a headache it is to get it back to looking ok inside and how round the houses it goes from WC to stack.
    • Like Like x 1
  6. glenno1

    glenno1 Guest

    Can you put a clip directly below the branch to support it
  7. stevetheplumber

    stevetheplumber Plumber GSR

    have you checked its not blocked seem like a lot of leakage i assume the water is coming out of the floor ? before cutting the stack id check for blocage and then cut back round the base see whats there chances are it just needs a cement fillet replacing round the drain
  8. Simon F

    Simon F Trusted Plumber GSR

    you could cut the stack then use a rubber fitting, don't look much but give more flexibility
  9. Monkey Wrench

    Monkey Wrench New Member

    Re: jjjjjzzzz

    Thank you for all the posts.

    Yes I could do but there would be sufficient support from the tee branch that goes directly into the wall to not make this necessary.

    I must admit I hadn't considered a blockage. The leakage is coming out from around the seal below the end of the socket just above the ground level.

    This link doesn't seem to working but, at a guess, is it rubber slip coupling with jubilee clips at each end ?

    What does this refer too ?

    Thanks again.
  10. tipintim

    tipintim Guest

    I would say that if that brown stuff is .. I would lift a manhole to eliminate a blockage first before you cut into . IMHO
  11. Monkey Wrench

    Monkey Wrench New Member

    It was a quick visit but, despite how the picture looks, I certainly don't recall it being "brown stuff".

    However, I'll now certainly be lifting a manhole cover before I even consider cutting into the stack !
    • Like Like x 1
  12. Monkey Wrench

    Monkey Wrench New Member

    Ok, I know this was over a year ago but the customer was supposed to come back to me and they never did..... until now. Things are still the same and the job now needs to be done.

    I can confirm that there are no blockages. The bottom fitting is a plastic double push fit coupling from standard black soil pipe to a larger underground plastic. The reason why it's leaking is that the rubber seal in the double coupling connecting on the red/orange underground pipe side has literally dropped out of the coupling. To me, this implies that the seal was pushed out when the stack was first installed as it wouldn't just fall out of its own accord. Additionally, there is a leak from an access panel so higher up so two leaks all together. The stack cannot be lifted as there is a right angle branch going directly into the wall approx 2.5m above the leaks for a toilet on the second floor.

    I have tried to find a similar push fit plastic coupling the same as the one in the picture but all I can find is a rubber coupling. The only way I can see doing the job is to cut about 6cm out of the pipe above the access panel and lift out the remaining soil pipe and coupling. Install a new coupler (plastic if I can find one, rubber if not) plus a new piece of pipe (with inline access panel if I can find one) and then a rubber slip coupling.

    I'd welcome any other alternative idea's or advice please.

    Thank you

  13. Koogatubac

    Koogatubac Plumber GSR

    Horrible jobs these ones.

    Access covers such like this one is now on a tee (believe i got them by osma)

    I think the best option would be to put a slip coupling on and fresh pipe, its obviously damaged the rubbers since normally 4" rubbers dont really give any problems..
  14. Monkey Wrench

    Monkey Wrench New Member

    Thanks for the post Koogatubac.

    I was intending to cut the pipe out just above the access cover and install a new coupling, piece of pipe (without access) and slip coupling where the cut had been made. However, I can't find a coupling the same as the leaking coupling (with blown seal) as I'll be taking out as they all seem to be rubber nowadays !

    Thanks again.
  15. Koogatubac

    Koogatubac Plumber GSR

    Sorry to be bearer of bad news lol its the silver fittings with the 2 jubilee clips each side that fits right, also you can use a pan connector that will slip inside the cast/clay if thats better?

    Its all a sightly job in the end. Best job but pricey would be to renew the stack
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