Running a new en suite soil pipe extension to existing stack

Discussion in 'Plumbing and Central Heating' started by david100, 1 Mar 2009.

  1. david100


    1 Mar 2009
    Thanks Received:
    United Kingdom
    Hi everyone,
    I am new to this forum and need some urgent advice from all you clever guys on here.
    I am fitting a new en suite bathroom (toilet, whb and pumped shower) on the 1st floor and wanted to run the 110mm soil pipe outside the house for approx 2.5 mtrs to the corner and then a further .55 mtrs to the existing soil stack. This run would be in the horizontal position with the required fall having 2 x 90 bends, one being at the exit of the WC and the other at the corner of the house. Simple solution I thought.
    However I have had a visit from Building Control and they have said this is not possible and that I should run the soil pipe internally above the existing bathroom floor with the use of a Stub stack in the new ensuite. If I do this then I will not be able to connect the whb and shower discharges into it as it will be too high.
    On reading the relevant part of "part H" it clearly states that a 110 mm pipe can be run up to 6 mtrs horizontally, so why cant I use my original plan.
    Hope this makes sense and advice/solutions can be given that will satisfy BC. Thanks in advance
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