Looking For Ideas How To Go About Laying This New Soil Pipe Please

jasonj1974 · 29 Nov 2019

Hi all

I'm currently in the early planing stages to fit an under stairs toilet (outside wall on left side of house is stairs) and after speaking to building regs my initial thoughts of laying an underground pipe on the left into the sewer may be problematic as it is a shared sewer and will need to involve the local water company and using a drop inside the manhole could be a problem.

The manhole is also quite deep at around 3.5 meters. The existing soil stack for the upstairs bathroom comes down inside the house behind some wooded boxing as shown on the diagram as a red box to the right of the front door the problem being I do not know how far down the pipe goes down under the house before it bends to go into the sewer (would it bend at manhole level or likely come out from the house first and then bend down), as I thought about connecting directly into the existing soil pipe to alleviate the shared sewer concerns.

Can anyone recommend ideas that I may not have thought of, it needs to be fully compliant with building regs etc as I plan on selling the property afterwards.

johnny2007 · 29 Nov 2019

Open up the stack box, connect new toilet to stack, job done.

jasonj1974 · 29 Nov 2019

johnny2007 said:
Open up the stack box, connect new toilet to stack, job done.

Cheers Johnny - how do you get to the stack box without digging up the floors inside the house to connect into it. I was thinking it would be easier to connect outside but worried the pipe would be laid 3.5 meters down as well. It would have to run through the hallway and into the kitchen to get to the box inside.

Apologies if that isn't what you meant by 'stack box'

johnny2007 · 29 Nov 2019

Ah, sorry i thought the new toilet would be close by the stack.
Well, in that case it's digging time to see where the pipe is outside.
3.5m down is very deep for a manhole.
Is it one of the large ones, with fixed ladder and 3 foot wide?

jasonj1974 · 29 Nov 2019

No ladder inside its rectangular around 2.5 feet wide sort of large paving slab size, you can see on the photo where the left side red line ends is the top of it in front of the front door.

jasonj1974 · 29 Nov 2019

Is there a possibility of digging down say 2 feet in front of the house then under the house to the down pipe and connect in that way ?

reds42 · 29 Nov 2019

What type of floor is it in the house?

If its a suspended floor you could maybe run the pipe under it to meet the stack - bit of work but not impossible. If poured concrete slab then maybe not.

jasonj1974 · 29 Nov 2019

Think its solid concrete so would be quite a job

johnny2007 · 29 Nov 2019

jasonj1974 said:
No ladder inside its rectangular around 2.5 feet wide sort of large paving slab size, you can see on the photo where the left side red line ends is the top of it in front of the front door.

Saw it.
3.5m down?
That's a depth!

CBW · 29 Nov 2019

It looks new, how old is it? If that’s a partially combined system, you don’t need to go as far. Failing that macerator?

jasonj1974 · 29 Nov 2019

The Novice said:
It looks new, how old is it? If that’s a partially combined system, you don’t need to go as far. Failing that macerator?

I think the house was built in the early 90s. I really don't want a macerator as I'm adding the toilet to sell the property on and a lot of people have issues with them coming to sell from what I see on property sites, a single toilet in a three bedroom house isn't ideal so really wanted to add a standard one. When you mean partially combined does that mean rainwater with foul water ?

jasonj1974 · 29 Nov 2019

johnny2007 said:
Saw it.
3.5m down?
That's a depth!

I was pretty surprised how far it went down when I lifted the slab - it may be more like 8 to 10 feet - not something easy to work in the bottom at all though.

jasonj1974 · 29 Nov 2019

Another angle showing the next drain in line and how far out from the house it comes.

reds42 · 29 Nov 2019

Your stack may not join directly to the drain in the manhole. May be worth looking at drainage map to check where your drains run.

jasonj1974 · 29 Nov 2019

reds42 said:
Your stack may not join directly to the drain in the manhole. May be worth looking at drainage map to check where your drains run.

Thanks - any idea where to find the drainage map - local council or somwhere else ? I was led to believe the local authority would only show the main drainage not the actual private pipe flows on the property

Bottom of manhole is flowing like this with the top pipe pointing directly towards the stack

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Looking For Ideas How To Go About Laying This New Soil Pipe Please

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