Problem with soil pipe/down spot.....any ideas?

Discussion in 'CycleChat Cafe' started by Dave7, 8 Nov 2018 at 12:56.

  1. Dave7

    Dave7 Guru

    Location:
    Cheshire
    We have a downstairs wc and a main wc/bathroom directly above it.
    Yesterday I flushed the downstairs loo and ALL the water syphoned out. I flushed again and it backed up-then syphoned out again.
    So........I assumed blocked drains.
    Just had manhole cover off.....no problem .....everything clear and flowing freely.
    Upstairs loo flushes fine.

    Spoke to a mate who thinks there may be a blockage in the stack between the 2 WCs. Said blockage may be preventing air being dragged down, therefor upstairs is fine while downstairs isnt.
    Any WC/FLUSH experts on here ???
     
  2. cosmicbike

    cosmicbike Perhaps This One..... Moderator

    Location:
    Egham
    Do they share the same stack? Sounds like a sticky air admittance valve perhaps?
     
  3. Skibird

    Skibird Active Member

    Other half has also just said it's probably an air block and asked whether it has got a DERGO on top of the stack pipe? I have no idea what he's talking about by the way lol :blush:
     
  4. OP
    OP
    Dave7

    Dave7 Guru

    Location:
    Cheshire
    Yes....same stack.
    It is outside and finishes approx one metre above the roof. Its open at the top.
    Where would the 'admittance valve' be?
     
    Last edited: 8 Nov 2018 at 13:26
  5. OP
    OP
    Dave7

    Dave7 Guru

    Location:
    Cheshire
    Nor me :blush:. But the top appears to be open so I guess it doesnt have one of those DERGO type thingies.
    Edit
    Just googled. Its a DURGO and no...we dont have one.
     
    Last edited: 8 Nov 2018 at 13:26
  6. Skibird

    Skibird Active Member

    If the stack pipe is open it would not be air locked then........................other half said lol, he laso said if it is a blockage, it will start affecting the upstairs loo as well (taking longer etc).
     
  7. meta lon

    meta lon Guru

    Location:
    pboro
    So the downstairs toilet has the problem and upstairs ok..

    I'd be looking at the pipe between the downstairs loo and the stack.
    Give the toilet a good pumping with the loo brush.
    Try that a few times and flush with a bucket of water.should clear it.
     
  8. sight-pin

    sight-pin Über Member

    Location:
    Floating about
    Sounds like theirs a blockage at the top loo, either at the branch or above as the downstairs is sucking the the water out the top loo instead of air from the stack.
    That's where i'd look first.
     
  9. OP
    OP
    Dave7

    Dave7 Guru

    Location:
    Cheshire
    Is there such a thing as a rod that will get around the U bend and to the stack?
     
  10. OP
    OP
    Dave7

    Dave7 Guru

    Location:
    Cheshire
    Sorry.....that has lost me (not too difficult tbh:blush:)
    What is "the branch or above"?
    How could the downstairs "suck water out of the top"?
     
  11. Spiderweb

    Spiderweb Veteran

    Location:
    North Yorkshire
    We have a similar drainage system, en suite bathroom waste directly above linked to downstairs cloak room waste. One day I heard a splashing sound in the cloak room, the toilet was overflowing following the toilet flush upstairs, it syphoned off eventually, upon investigation it was a blocked underground waste (years of baby wipes used by wife and daughters). We've never flushed baby wipes since.
     
    Last edited: 8 Nov 2018 at 14:53
  12. Globalti

    Globalti Legendary Member

    Yes if the exit from the upstairs bog is partly blocked the water from the downstairs bog will continue to syphon until air gets in and breaks the syphon.

    Go up with a bucket of water, flush the loo and tip the water straight down the loo fast at the same time; with luck the force of water will dislodge all the wet wipes your family have been flushing down there. Best advice with them is to get wet loo paper, which comes in smaller sheets and even tear the sheets in half before using them. I have had the same problem with our downstairs loo getting blocked by wet wipes.
     
  13. Phaeton

    Phaeton Veteran

    Location:
    Oop North (ish)
    Surely you should never put wet wipes down the toilet, they will never degrade will they? But that doesn't help the OP, go buy a plunger, tip eatra water into tioliet use plunger, that should move any blockage between downstairs & soil stack.

    I don't know what a DERGO is but suspect it's one of the close coupled units that allows air into the system, but not vapours out, we don't have an outside soil pipe now, just a short pipe with a unit on in the extension roof space.
     
  14. meta lon

    meta lon Guru

    Location:
    pboro
    Yes but you won't need it if you do what I suggested.

    This type of thing will do it 15416893408217198137827196687058.jpg if you get stuck.
     
    Illaveago, raleighnut and Dave7 like this.
  15. sight-pin

    sight-pin Über Member

    Location:
    Floating about
    Ah! I read it wrong, Thought when you pulled the chain on the lower loo it was sucking the water out the top loo.
    The branch is the 'T' joint outside where the loo enters.
     
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