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

Drain run at bottom of foundation

Discussion in 'Building Regulations and Planning Permission' started by garyo, 3 Apr 2020.

  1. garyo

    garyo

    Joined:
    11 Apr 2006
    Messages:
    2,144
    Thanks Received:
    199
    Location:
    Berkshire
    Country:
    United Kingdom
    I have a clay drain run that crosses perpendicular to my foundation. The invert of the pipe is 50mm higher than the bottom of the foundation. Is it acceptable to box this in with 22mm OSB, fill with pea shingle, then mass-fill over the top without lintelling, or should I position some rebar lengths or PSC lintels over the top before mass filling? I expect the span would end up being ~300mm.

    I don't particularly want to shutter all the way to the top of the foundation for fear of it leading to a weakness in the run that might lead to brickwork cracks through differential settlement of either side of the foundation.

    Thanks
     
  2. Sponsored Links
  3. noseall

    noseall

    Joined:
    2 Feb 2006
    Messages:
    43,510
    Thanks Received:
    2,689
    Location:
    Staffordshire
    Country:
    United Kingdom
    Some BCO's will accept a box formed over the pipe, giving a clearance margin of say 100mm around the pipe. Is it a sewer or is it sole ownership?

    The foundation should always be deeper than the pipe.
     
    • Thanks Thanks x 1
    • Like Like x 1
  4. garyo

    garyo

    Joined:
    11 Apr 2006
    Messages:
    2,144
    Thanks Received:
    199
    Location:
    Berkshire
    Country:
    United Kingdom
    Thanks. It's a single clay 100mm drain pipe that takes the foul from our downstairs loo, so sole ownership.

    The foundation is just deeper than the pipe by around 50mm.
     
    • Like Like x 1
  5. martin hill

    martin hill

    Joined:
    7 Oct 2019
    Messages:
    460
    Thanks Received:
    78
    Location:
    salford
    Country:
    United Kingdom
    My drain inspection chamber is outside my french doors on the extension. When built they dug the pipe out and replace with a plastic one and poured the foundation. Then up with foundation blocks with a gap round it with a lintel cut into two and placed over the top with clearance. Dont think they filled in with anything like pea shingle on the foundation just a pea trench on each side if that helps.
     
  6. noseall

    noseall

    Joined:
    2 Feb 2006
    Messages:
    43,510
    Thanks Received:
    2,689
    Location:
    Staffordshire
    Country:
    United Kingdom
    As above - noo need for shingle, keep it clear.
     
  7. garyo

    garyo

    Joined:
    11 Apr 2006
    Messages:
    2,144
    Thanks Received:
    199
    Location:
    Berkshire
    Country:
    United Kingdom
    Cheers chaps. I'll box in and keep my fingers crossed.
     
  8. 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

     
  9. Sponsored Links
Loading...

Share This Page