Advice in laying a new soil pipe

Paul White 1984 · 7 Oct 2021

Hello All,

Could someone please offer advice on what would be the best way to install a new soil pipe.

I am looking to add a downstairs toilet to my house, the current bathroom is upstairs. Ive taken pictures of the current arrangement which has an existing soil pipe joining to the inspection chamber, along with a second pipe that also joins to the chamber which carries gutter surface water and kitchen water.

Would it be possible to join a new soil pipe to this existing non-soil pipe? Or would i have to join to the chamber as a completely seperate line? Joining to the existing pipe sounds a lot less work than breaking into the concrete chamber.

Ive included photos here, hopefully it makes things clearer.

Thanks in advance.

Exedon · 7 Oct 2021

Much better job to put it into chamber separately haunching probably won't take that much chopping through.

tell80 · 7 Oct 2021

Abit odd. the existing soil pipe is entering the m/h aginst the flow and dumpingabove the haunching ie. no channel fitting present.
What diameter is the existingpipe that runs from the waste and rainwater pointt through the m/h - is it 110mm?if it is 110mm then the proposed new soil pipe could tie into it well before the m/h as in proposal2.
the waste and rainwater point should be a traapped gulley. It could be arranged that the Aco linear drains into the trapped gulley.
offpage but the rendered m/h wall is well cracked and roots are entering.itneeds seeing to.

Hugh Jaleak · 7 Oct 2021

The new drain run would need to join into the chamber to allow access for rodding in the vent of a blockage, you really wouldnt want to be trying to clear it from inside the property..... Given the situation and reasonably shallow depth of the existing sewer, I would suggest breaking that existing chamber and getting rid, then graft in a new 450mm plastic chamber, reconnect the existing runs, and you'll have a 45 and 90° inlets available on the opposite side to connect the new WC.

Would also allow the connection from the upstairs soil pipe to be rejigged and hopefully let the flow enter the chamber at a more controlled pace, to avoid fouling the opposite side of the chamber.

Looks like a private sewer so Water Co wont be bothered, but Building Control would need to be informed.

Exedon · 7 Oct 2021

Building regs H.23 layout tell you to keep drain runs as simple as possible. If you do connect as in proposal 2 how do you intend getting rodding access to the branched in section?
As drain runs are so short I would seriously consider installing new 460mm inspection chamber and make a much better job of existing connections.

Paul White 1984 · 8 Oct 2021

Thankyou for the advice. The consensus seems to be to create a dedicated entrance to the chamber for the new soil pipe so i'll go with that. Not sure about replacing the chamber with a new one though, sounds a bit pricey. Thanks all.

Hugh Jaleak · 8 Oct 2021

New chamber about £100-150 for the bits, but it's your call.

petit_pablo · 8 Oct 2021

Hugh Jaleak said:
but Building Control would need to be informed.

Take note of this

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Advice in laying a new soil pipe

Paul White 1984

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