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

Connecting detached garage to existing soil stack

Discussion in 'Plumbing and Central Heating' started by Iamnotarobot, 17 Aug 2017.

  1. Iamnotarobot

    Iamnotarobot

    Joined:
    17 Aug 2017
    Messages:
    3
    Thanks Received:
    0
    Country:
    United Kingdom
    Afternoon All,

    I have a detached garage which I wish to have a waste pipe installed in for a dog grooming bath. The new build house has an internal soil stack in the corner closest to the garage.

    Plan is to dig up the garden alongside the garage and run a 6m long soil pipe just under the house foundation and into the existing soil stack before it inverts towards the inspection chamber which is not near the garage.


    Question is how deep does the typical soil stack go into the ground before it inverts? Also, if it inverts to soon and I can not get a connection then what are my option?
     
  2. Hugh Jaleak

    Hugh Jaleak

    Joined:
    3 Feb 2008
    Messages:
    5,887
    Thanks Received:
    1,220
    Location:
    Northamptonshire
    Country:
    United Kingdom
    Answer to question is How long is a piece of string? Only way to find out is to dig down and find it, but by the sound of things you would be better to dig down outside the footprint of the house and couple onto the underground drain, not the stack.

    You really don't want to be undermining the foundations, and you cannot connect to a stack lower than 450mm above the invert of the tail of the bend at the foot of the stack.

    Connect to the drain with a suitable method, (junction or inspection chamber, you will need to notify Building Control at the local Council, so they will advise what is required), then run in a straight line to your garage, and fit a bottle gulley or stub stack for the waste to discharge into.
     
    • Thanks Thanks x 1
  3. Iamnotarobot

    Iamnotarobot

    Joined:
    17 Aug 2017
    Messages:
    3
    Thanks Received:
    0
    Country:
    United Kingdom
    Does anyone know why you cannot connect 450mm to the tail? Interested in the logic of it.?
     
  4. Hugh Jaleak

    Hugh Jaleak

    Joined:
    3 Feb 2008
    Messages:
    5,887
    Thanks Received:
    1,220
    Location:
    Northamptonshire
    Country:
    United Kingdom
    The 450mm rule applies to buildings of up to 3 storeys, higher buildings, and that distance needs to be increased. Theory is, waste falling from above will compress the air underneath as it travels, and to prevent this slight increase in pressure blowing out traps etc, the regs prohibit connections in that bottom 450mm section.
     
  5. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    11,685
    Thanks Received:
    3,328
    Location:
    Lanarkshire
    Country:
    United Kingdom
    wait till you see the regulations regarding the water supply to taps ,showers etc for pet washing you might change your mind
     
  6. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page