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Discuss Soil Pipe Vent Question in the Plumbing Forum area at

  1. David Usher

    David Usher New Member

    Hi all,

    In my new build I have 4 soil pipes that pop up at various walls on the ground floor. All pipes connect into a single pipe for the sewer.
    One pipe will connect to a toilet on the first floor and also connect to the shower and sink waste. Another will connect for kitchen water waste and the others for future provisions.

    For building regulations I understand that I need a vent.
    My question: Do I need to vent in only one place - i.e. near the toilet or do I need to vent all pipes?

    For the vent, how high does it need to vent?

  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    i would vent one to outside and then shove the rest on durgos
    • Agree Agree x 3
    • Like Like x 1
  3. Darren Jackson

    Darren Jackson Plumber GSR

    The one outside venting to atmosphere has to be a minimum of 900mm above any opening to the building ie window, dormer or vent etc.
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Isn't that with a Durgo on thought it was 1.2m for natural ?
  5. David Usher

    David Usher New Member

    OK, so I'll vent the one connected to the toilet (which is at a high point).

    Regarding the Durgos, I understand they have to be placed on a vertical connection. Do they have to be a certain height and presumably these are OK to add on the first and ground floor?

  6. Last Plumber

    Last Plumber Trusted Plumber GSR Top Contributor!!

    The original distance was three foot above any opening into a building. I still use that and I wish the rest of the world would stick to what's in my head lol.
    • Agree Agree x 2
    • Like Like x 1
  7. Darren Jackson

    Darren Jackson Plumber GSR

    Minimum 3ft (900mm) in my head too. I still stick to that as well. Makes me cringe how many times I see a low level hopper T'd into a stack or a gutter downpipe put into a stack effectively making the height of the vent void and now venting at gutter level inches away from a bedroom window or venting out of the hopper at the side of a kitchen door etc..
    • Agree Agree x 2
  8. oz-plumber

    oz-plumber Plumber

    To really get technical about the situation, you need to provide a plan of the drain runs, distances and pipe sizes.

    There are regulations available about venting of soil pipes available.
    As long as you follow the regulations, you shouldn't have a problem
    • Agree Agree x 1
  9. chris watkins

    chris watkins Plumber

  10. oz-plumber

    oz-plumber Plumber

    My understanding of AAV's were to be fixture based
    eg: You have a basin installed to a stack and you can't get the allowed distance from the vented stack to the fixture location.
    So without running a vent from the fixture to atmosphere you could install an AAV.

    I would never install an AAV at the top of a stack or on a branch drain that is picking up several fixtures.
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