New bathroom far away from existing soil pipe. Is this feasible?

[Jonny Vee]

Hi,

Not sure if this is the right place to post it

I was thinking to add a new bathroom against the party wall side and basically the opposite side of the existing soil pipe. I have attached drawings showing I have 5.5m to reach the external side of the house and another 5 m to reach the existing upstair bathroom soil and vent pipe.

Would this be possible? I have an old wood flooring system that should allow having some fall inside and concrete outside which can easily break and make a channel for the pipe.

Please advise on your experience.

Thanks

 

[Hugh Jaleak]

You need to look at achieving a 1:40 fall (gradient) on the soil pipe, so thats approximately 130mm of fall across the internal section. Once outside, you'll need to put a access chamber in at the change in direction, then aim to connect to the sewer leading away from the existing soil pipe, (unlikely you'll be allowed to connect to that, as you'll be too close to the bottom). You will then need another chamber where you connect to the existing drain.

All work will need to be approved by Building Control at the local Council.

 

[cdbe]

Can you do it all at first floor level and break into the existing first floor bathroom SVP rather than going below ground?

 

[Jonny Vee]

Can you do it all at first floor level and break into the existing first floor bathroom SVP rather than going below ground?

The bathroom I want to do is at ground level.

 

[Jonny Vee]

You need to look at achieving a 1:40 fall (gradient) on the soil pipe, so thats approximately 130mm of fall across the internal section. Once outside, you'll need to put a access chamber in at the change in direction, then aim to connect to the sewer leading away from the existing soil pipe, (unlikely you'll be allowed to connect to that, as you'll be too close to the bottom). You will then need another chamber where you connect to the existing drain.

All work will need to be approved by Building Control at the local Council.

HI, Thanks for the technical support. I got a little bit lost. I run the pipe from the bathroom with 1:40 gradient straight outside the house. I then put the access chamber and dig the trench to the current sewer. To get it approved from building reg where I need the second chamber?

Apologize if it may seem a stupid question, I'm just trying to get it right and once submitted to BCO won't them to comment or reject.

 

[Hugh Jaleak]

No, the whole lot will need BCO approval. Assuming you can get the correct fall across the pipework internally, see what level that gets you to outside. The drain will also need laying on a 1:40 fall, however you will be governed by the depth of the existing drain you are connecting to. If not too deep, run back to the house at that depth, and use a couple of bends immediately outside the house to lower the pipe coming through the wall to the drain.

However, if the existing drain is ridiculously deep, come back, as there are ways of laying a new drain at a shallower depth, then dropping to meet the required invert (level) of the existing drain.