Soil pipe along outside wall of house

[Munzy]

I’m having a nightmare trying to get waste away from a planned en-suite the far side of the house from the existing stack.

Due to a sloping site, three levels within the building and an open plan layout I have two options:

1) Install a pumping station underground to take the soil, macerate and then pump it to the far side of the house.

2) Run a soil pipe 7m along the inside of the house, through the external wall, turn 90 degrees and then continue along the external side wall for 12m before dropping down into the existing stack.

Whilst I’m much more comfortable with the pumping station than an individual macerator in the bathroom is like to avoid it if possible.

Is a long run along the external wall a consideration? I can easily find a fall of 25mm per meter inside and outside with the one right angle in between.

 

[muggles]

Building Regs state that the maximum permitted length of a soil pipe branch is 6m, so your 19m is well over I'm afraid. Can't you construct a new stack for it and connect into your main drainage underground?

 

[Munzy]

Building Regs state that the maximum permitted length of a soil pipe branch is 6m, so your 19m is well over I'm afraid. Can't you construct a new stack for it and connect into your main drainage underground?

Ah balls!

Unfortunately your suggestion isn’t possible, I don’t have enough fall between where I need the new stack and the existing drain the other side of the house because of the sloping site; essentially the main drain is uphill from the new bathroom.

I’ll post a picture.

 

[Munzy]

 

[Munzy]

And tapping into the main sewer isn’t an option due to time, money and the complexities of the land under which I would need to run not belonging to me.

 

[muggles]

I think a pump station is going to be your only option then. The soil stack option comes under work which is notifiable to Building Control, who will almost certainly tell you you can't do it.

 

[Munzy]

I think a pump station is going to be your only option then

Any first hand experience of these things? I’m thinking of using a 190L tank to serve the ensuite’s single toilet, basin and shower.

 

[muggles]

@just pumps is your man for that

 

[MeldrewsMate]

Is it possible to move the toilet to another wall of the en-suite, thereby saving a metre of pipe length, then use the internal run option. This is becuase I believe the regs do not allow any point to be 6m or more from a rodding point, and not the max length of the run to be 6m. Thus a straight pipe with a rodding point at each end could be up to 12m long.
At the bend where the pipe exits the building envelope, install an access bend (rodding point), then down to the existing sewer.

I hate macerators/she-ite pumps, they are long term liabilities.

Have you considered, given the sloping site, running your new waste to a septic tank system?

 

[Munzy]

Is it possible to move the toilet to another wall of the en-suite, thereby saving a metre of pipe length, then use the internal run option. This is becuase I believe the regs do not allow any point to be 6m or more from a rodding point, and not the max length of the run to be 6m. Thus a straight pipe with a rodding point at each end could be up to 12m long.

Interesting. So you’re saying that if I could stick to maximum 6m runs (essentially turning a 12m run into two 6m runs) with rodding points at each end I would meet regs?

Is this definitely correct?

Have you considered, given the sloping site, running your new waste to a septic tank system?

The lower side of the slope adjoins a road with limited space for a septic tank.

 

[dilalio]

Best bet would be to get BC out and discuss options with them.

 

[bernardgreen]

Any first hand experience of these things? I’m thinking of using a 190L tank to serve the ensuite’s single toilet, basin and shower.

We installed a Monopumps Grifter domestic sewage pump about 20 years ago in the house we built. Totally reliable unit.

http://www.mono-pumps.com/grifter_pump_system

 

[Hot&Cold]

Could the en-suite be re planned so the wet goods are closer to the existing soil pipe ?

Only onsite investigation will determine if the only solution is a foul/grey water pump.have been involved in basement conversions where pumps have been required but have always got in a specialist pump installer to install,notify and commission.

They use delta pumps,not to noisy when discharging

 

[muggles]

Interesting. So you’re saying that if I could stick to maximum 6m runs (essentially turning a 12m run into two 6m runs) with rodding points at each end I would meet regs?

Is this definitely correct?



The lower side of the slope adjoins a road with limited space for a septic tank.

New one on me if that's the case. As said though, you need to notify the intended works to Building Control so you should get them out first and ask what they'll be happy to sign off

 

[just pumps]

Munzy, thanks for the PM but I`m going to reply here out in the open if you don`t mind.
I don`t have any experience of doing the calculations for sewage lifting stations on new installations, I only deal will the servicing & repair side of things. I`ve never heard of that company or that make of pump in the link you supplied so can`t offer any comment however I have worked with this company before though https://www.google.co.uk/url?sa=t&r...ology.co.uk/&usg=AOvVaw324U83lZIHGXgnRLYg8459

You need a Grinder / Macerator system not a Grey water system, personally I would used a duplex system with a high water level alarm even though the costs do add up.