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

[Deleted member 267285]

When you mean partially combined does that mean rainwater with foul water ?

Yes. It might be worth checking out.

 

[jasonj1974]

Yes. It might be worth checking out.

What benefit would that give - allowing to use a rainwater drain for the waste to connect to ?

 

[Deleted member 267285]

What benefit would that give - allowing to use a rainwater drain for the waste to connect to ?

No, it just means that where it bends round to go to manhole, you could change the bend for a y piece and join on, just might save on the extra digging.

 

[Hugh Jaleak]

Unlikely a property of that age will be on a combined sewer, they started phasing those out in the 50's.... Secondly, it will be unlikely the Water Co's sewer map will have that level of detail, it may show the shared sewer if you're lucky, but the run from that to the house is probably not shown.

Only way you're going to do what you propose I suspect, is going to be to dig down and find the main (shared) sewer where it runs across the front of the house, and connect there. Bear in mind, if the sewer is indeed the depth quoted, then you will have no choice but to put another chamber in to make the connection, and install an external backdrop to bring the sewer up from the invert level of the chamber, before running back to the house, and then another, (a small chamber may suffice), to turn 90° towards the house.

Really think you need to ask yourself, if this extra WC is going to add sufficient value to the property to make it worthwhile doing the work required.

 

[oldbutnotdead]

Take it your driveway is concrete? That's going to be hard work.... quite a lot of groundwork involved. How much value will a downstairs loo add (I know it is very handy having one but your setup is going to be a dear do). You could have your soil pipe exit the house, drop underground a bit then along the side, across the front and meet the existing stack. Or dig down 3500 so the new soil pipe hits the existing manhole at invert level (and if its a shared drain your water company will be wanting some cash off you as well)

 

[jasonj1974]

Thanks for all the replies everyone greatly appreciated.

How about staying inside instead, here's a crude diagram from the under stairs proposed toilet to the existing stack inside a wooden box going down the inside of the kitchen wall. Would it be easier to dig inside total length is only around 3 meters, not sure what floor is but assume concrete so same as outside and then connect into the stack around a foot or so down from floor levels so long as the fall from the toilet to soil pipe is correct. Putting some cheap carpet and lino back on top when done isn't a problem and the building work is a friend so already giving a very good price for total outside work. This way no water companies involved and just a simple building reg sign off.

I was going to run water pipework through floorboards from upstairs bathroom and drop down but could take from kitchen instead saving any upstairs under floor work while the floor is up downstairs.

 

[reds42]

If its a block and beam suspended concrete floor you wouldn't be able to just cut a trench accross - but then there might be a void beneath.

Youll have to investigate how the floor is constructed.

 

[jasonj1974]

If the floor is all good, builder seems to think it screeded then concrete and underneath that just hardcore. Can anyone see any glaring issues with my rather crude drawing - builder knows exactly what type of connections etc are needed.

 

[Ian H]

Are you sure your foul drain isn’t on a back drop shaft to get to the 3.5mtr depth? If it is you could connect in at the higher level somewhere.

 

[jasonj1974]

Are you sure your foul drain isn’t on a back drop shaft to get to the 3.5mtr depth? If it is you could connect in at the higher level somewhere.

Not sure how I could tell, there isn't any inspection chambers before the manhole.

 

[Ian H]

Not sure how I could tell, there isn't any inspection chambers before the manhole.

There would be a bit of 4” pipe higher up the manhole wall like this:

The arrows show how the pipes would run.

 

[jasonj1974]

There would be a bit of 4” pipe higher up the manhole wall like this:

View attachment 177306

The arrows show how the pipes would run.

Nothing else in manhole apart from the bottom runs looking like this, the top pipe points towards the soil stack in the house.

 

[plastic_peanut]

Looks like a lot of effort to increase the house price. I assume the sell price will outway the cost of the works?

Looks like the internal connection is a good suggestion but I would be concerned you aren’t necessarily going to know what the floor construction is until you have committed to the works.

If it was me, I would have the property valued by a local estate agent and ask what the price would increase to with a downstairs WC. Assuming the benefit outways the costs and headache. They may be able to share houses that have had the work done and you could maybe knock on the door.
Otherwise look at zoopla and rightmove for sales in your neighbour to see if any similar homes have had a WC retrofitted.
May just help you decide which direction to take before picking the tools up