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Toilet outlet lower than soil

Discussion in 'Plumbing and Central Heating' started by EdTurtle, 16 Oct 2020.

  1. EdTurtle

    EdTurtle

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    Currently doing a new downstairs toilet, but moving the toilet to a new location. The old toilet outlet is about 180mm from the floor, which goes pretty much horizontally into the soil pipe, which is roughly 30cm from the toilet. The new toilet will be around 2-3m away from this location (haven't decided yet). My calculations suggest the minimum fall on 2m should be 2cm total drop, so this will basically put the outlet of the soil pipe 2cm higher than the toilet outlet. I would prefer the toilet in another location, this will be about 3m away, this will require a 3cm drop?

    I cant lower the branch connection on the stack at all (I dont think - its in concrete, can provide a pic if necessary?)

    What options have i got here? I am hoping i cant get away with a 20mm offset toilet pan connector, rather than putting the toilet on a plinth. Will this work? Failing that i guess i can get a wall hung toilet? If i go for the 3m run, 3cm drop, can i use a 40mm offset connection, then increse drop to 4cm?

    Thanks
     
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  3. CBW

    CBW

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    Yes a photo of the branch might be helpful, along with a proposed simple diagram.
     
    Last edited: 16 Oct 2020
  4. magicmushroom666

    magicmushroom666

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    I've got a toilet where its been bodged with an offset to make it go uphill and the flush is terrible, struggles to even flush a bit of paper, so I wouldn't try it on a new install!
     
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  5. Hugh Jaleak

    Hugh Jaleak

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    Important law of Physics, sh1t wont run uphill. If you cant get a fall on the outlet from the WC pan to the stack then I'm afraid you're going to get nothing but problems. The old High Level cisterns might just have managed it, the flush was so devastatingly effective, very little would be able to hang on in there. Modern 6 litre close coupled WC's have no chance.
     
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  7. EdTurtle

    EdTurtle

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    I had hoped that a 2cm bit wouldnt be too bad, since its got to go round the bend anyway. I suppose the option is to build a plinth out of ply? Would MDF be ok if its siliconed in?

     
  8. CBW

    CBW

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    It may be possible where the black coupling below the branch is replaced with a McAlpine dc1, not a great amount, but would lower it slightly, just need to be careful of those copper pipes and the skirting board.
     
  9. JimCrow

    JimCrow

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    Depending on how handy you are, it is possible to drop the branch down by chipping round the supersleeve pipe and cutting it from the inside with a 85mm tile blade on a dril with a 10mm bolt and washers for an arbour, you already have a 110mm repair collar above the branch.

    tile blade.PNG
     
  10. EdTurtle

    EdTurtle

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    It looks to me that the black bit (what is this made of?) goes into a clay bend, but i cant be sure, i'll try to get a closer pic. Would prefer to replace the black bit, rather than cut it, access is pretty limited there. How would i get it off? I could always cut it shorter after its off anyway. Would i need to replace some pipe below the repair collar?

    Thanks
     
  11. DIYnot Local

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