Footing issues [with images]

[Johnjames32]

Good evening all. 

 

Having recently started our 2 storey side extension and single rear, weve hit a bit of a snag..... sewer drains.

 

Having spoken with Seven Trent before work commenced our utilities provider as well as the local council (neighbours had an extension fairly recently), neither had any records of any existing drain/sewer runs across the back of the houses.

 

We has dug our footings to just over 1m below ground level as advised by the architect. Building inspector visited the property yesterday and advised to dig about 150mm lower at the rear to achieve sandier ground conditions (similar to that of the side). In doing so, we've discovered what looks like an existing sewer main....

 

What would people advise? Currently the single story (where the trench and subsequent sewer run is located) is only half the width of the house..... could we divert and put x4 90° angles and redirect the sewer (2 at the start and 2 at the end of the run)... I understand we would need permission from Severn trent but this seems the most logical approach? It would mean digging a new trench running parallel to the existing?!

 

Would welcome advice please.....

 

https://ibb.co/ZdwPs23

 

[Russell griffiths]

Oh bugger, that just got expensive. 

I wouldn’t use 90 bends they are to sharp, but it’s hard to say what you are proposing from that picture. 

[Jeremy Harris]

As @Russell griffiths says, I think we need a bit more info.  Can you try and see where the inspection chambers are, relative to that pipe you've uncovered?

 

There should be inspection chambers wherever a drain connects to that one, so in line with that run.  Tracing back where these are will give you a better idea of what you're dealing with.  It's debatable as to whether this has anything to do with the water company, it could be just one of your own drains, or it may even not be a foul drain at all, but a rainwater drain leading to a soakaway.

[scottishjohn]

37 minutes ago, JSHarris said:

As @Russell griffiths says, I think we need a bit more info.  Can you try and see where the inspection chambers are, relative to that pipe you've uncovered?

 

There should be inspection chambers wherever a drain connects to that one, so in line with that run.  Tracing back where these are will give you a better idea of what you're dealing with.  It's debatable as to whether this has anything to do with the water company, it could be just one of your own drains, or it may even not be a foul drain at all, but a rainwater drain leading to a soakaway.

yep a a bit of Archaeology required on your part

[Carrerahill]

1 hour ago, Johnjames32 said:

Good evening all. 

 

Having recently started our 2 storey side extension and single rear, weve hit a bit of a snag..... sewer drains.

 

Having spoken with Seven Trent before work commenced our utilities provider as well as the local council (neighbours had an extension fairly recently), neither had any records of any existing drain/sewer runs across the back of the houses.

 

We has dug our footings to just over 1m below ground level as advised by the architect. Building inspector visited the property yesterday and advised to dig about 150mm lower at the rear to achieve sandier ground conditions (similar to that of the side). In doing so, we've discovered what looks like an existing sewer main....

 

What would people advise? Currently the single story (where the trench and subsequent sewer run is located) is only half the width of the house..... could we divert and put x4 90° angles and redirect the sewer (2 at the start and 2 at the end of the run)... I understand we would need permission from Severn trent but this seems the most logical approach? It would mean digging a new trench running parallel to the existing?!

 

Would welcome advice please.....

 

https://ibb.co/ZdwPs23

 

Is it a sewer?  Or is it your drain?

 

Just for clarity, a sewer is what a utility company own, the definition of a waste pipe/drain/soil pipe is that if it only carries waste from a single dwelling and it's outbuildings and drains then it is just a waste pipe - if it passes into your property line carrying waste it immediately becomes a sewer.

 

Confirm what it is carrying first. We have a similar pipe along the side of our house but it only carries rainwater from the front gutters - I am going to trench it across into a new manhole much further over that will connect up to the garage too before heading back to the main stack joint.

 

 

Edited July 16, 2019 by Carrerahill

[Johnjames32]

Thanks all.

 

You'll have to forgive the terrible drawings as I've just done it on my phone on paint, but you can see the manhole (neighbours property) and where the existing drainage runs through out footings

[joe90]

No manholes on your property?, where are your drains?. My sister had drains for the street running through her backyard which caused problems with extensions.

[scottishjohn]

replace full length that goes under house with modern plastic

-encase in concrete and another manhole at other side ?

 no doubt someone will comment if this is allowable

Edited July 16, 2019 by scottishjohn

[Mr Punter]

I would replace the run and divert the whole length with 4 no 15 deg bends. It seems odd that it does not serve your property. Anything on your deeds, such as rights for others to run services over the land?

[ProDave]

It might serve your property.

 

In a previous semi detached house we had a pipe like that, with the manhole next door almost on the boundary, and indeed out waste connection went into that chamber in next doors garden.