1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Connecting new utility & toilet space to existing drainage??

Discussion in 'Plumbing and Central Heating' started by DHPea, 20 Jan 2021.

  1. DHPea

    DHPea

    Joined:
    20 Jan 2021
    Messages:
    5
    Thanks Received:
    1
    Country:
    United Kingdom
    Hi, I'm looking for some advice / guidance on a project we are considering.

    We are considering putting a new utility and toilet space downstairs. In order to do this we would need to run the waste pipes backwards, circa 2 metres, to join the existing waste drainage which joining waste from upstairs bathroom and kitchen; then flows out to the main drains out to the street.

    First question - is it possible to run the flow backwards to join the existing drainage?

    Then, if so, can you provide some guidance on how best do to so.

    Thanks in advance for any help.

    Thanks
     
  2. Sponsored Links
  3. Chris_W

    Chris_W

    Joined:
    26 Sep 2019
    Messages:
    5,766
    Thanks Received:
    1,529
    Location:
    North
    Country:
    United Kingdom
    Backwards? A rough sketch or photos may help, but I’m thinking you mean something else?
     
  4. DHPea

    DHPea

    Joined:
    20 Jan 2021
    Messages:
    5
    Thanks Received:
    1
    Country:
    United Kingdom
    Hi Chris - here is an image (please excuse the drawing) and as you can guess I'm not a plumber!! :D Thanks.
     

    Attached Files:

    • Thanks Thanks x 1
  5. Chris_W

    Chris_W

    Joined:
    26 Sep 2019
    Messages:
    5,766
    Thanks Received:
    1,529
    Location:
    North
    Country:
    United Kingdom
    Yes this is fine, just need to cut into existing soil pipe (if that’s what existing is) with a branch.
     
    • Thanks Thanks x 1
  6. DHPea

    DHPea

    Joined:
    20 Jan 2021
    Messages:
    5
    Thanks Received:
    1
    Country:
    United Kingdom
    That is great news! Thanks Chris. With regards to a connect to the existing soil pipe would I use a multi point boss pipe and is there any requirement on angles at all?
     
  7. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    12,761
    Thanks Received:
    2,833
    Location:
    Daventry
    Country:
    United Kingdom
    Worth pointing out that this work is notifiable to Building Control, so you'd be well advised to get them involved as soon as you decide to go ahead.
     
    • Thanks Thanks x 3
  8. Sponsored Links
  9. Chris_W

    Chris_W

    Joined:
    26 Sep 2019
    Messages:
    5,766
    Thanks Received:
    1,529
    Location:
    North
    Country:
    United Kingdom
    No, better using a soil branch, as for falls, 18mm per metre, minimum. Have a look at downloading building regulations document H.
     
    • Thanks Thanks x 1
  10. DHPea

    DHPea

    Joined:
    20 Jan 2021
    Messages:
    5
    Thanks Received:
    1
    Country:
    United Kingdom
    Thanks muggles; we have BC engaged already on the extension work already so will make sure to raise with them.
     
    • Like Like x 1
  11. DHPea

    DHPea

    Joined:
    20 Jan 2021
    Messages:
    5
    Thanks Received:
    1
    Country:
    United Kingdom
    Perfect Chris; I downloaded that earlier; bit of a read! Really appreciate your help.
     
    • Like Like x 1
  12. Chris_W

    Chris_W

    Joined:
    26 Sep 2019
    Messages:
    5,766
    Thanks Received:
    1,529
    Location:
    North
    Country:
    United Kingdom
    Thanks, I wasn’t aware. I’m guessing because of my employer, all of this would have been dealt with by them, for works I did as a plumber.
     
    • Thanks Thanks x 1
  13. Hugh Jaleak

    Hugh Jaleak

    Joined:
    3 Feb 2008
    Messages:
    7,033
    Thanks Received:
    1,632
    Location:
    Northamptonshire
    Country:
    United Kingdom
    Assuming the existing run as shown in Green is underground, then you wont be allowed (or wise) to connect a WC on a blind junction, as you'll have no method of clearing the WC branch run should it block. Believe me, removing the pan to clear from the top end is NOT something you'd ever want to do.

    Does the existing sewer run externally as shown across the top of the diagram? You'd be better off going straight through the wall and making a connection onto the run there, probably with a chamber. Wastes can easily be connected via boss connections or externally via a gulley.
     

    Attached Files:

    Last edited: 21 Jan 2021
    • Thanks Thanks x 1
Loading...

Share This Page