building extension over existing access chamber sitting just outside kitchen window

[Lars P]

In digging out for block and beam for new extension to kitchen just found an 30cm wide ish chamber hidden under the existing paving. It's not on the public sewer.

Could I add a rodding point to the incoming 110mm piper under the kitchen sink or do I have to install a new rodding point from outside the new extension ?
I'd replace the chamber with a new y connector and connect it to a straight run to a rodding eye outside the extension - but as it's a terraced house it can't just be to the side of the extension instead a 180 degree long radius bend is required. Seems counterproductive - but of course don't have to deal with a kitchen drain clog from within the kitchen.

Has never happened in the last 20 years at least.

Any thoughts ?

Cheers

[Nickfromwales]

56 minutes ago, Lars P said:

In digging out for block and beam for new extension to kitchen just found an 30cm wide ish chamber hidden under the existing paving. It's not on the public sewer.

Could I add a rodding point to the incoming 110mm piper under the kitchen sink or do I have to install a new rodding point from outside the new extension ?
I'd replace the chamber with a new y connector and connect it to a straight run to a rodding eye outside the extension - but as it's a terraced house it can't just be to the side of the extension instead a 180 degree long radius bend is required. Seems counterproductive - but of course don't have to deal with a kitchen drain clog from within the kitchen.

Has never happened in the last 20 years at least.

Any thoughts ?

Cheers

A diagram with some idea of layout etc would really help folk to comment further. Just pen and paper is fine.

 

[saveasteading]

1 hour ago, Lars P said:

Has never happened in the last 20 years at least.

Any thoughts ?

My thought is that sod's law will come into play.  Plus it could be spotted in a survey.

So work to standards if possible. Maybe  a branch and a rodding point as you suggest: in the kitchen or beyond the extension.

[Nickfromwales]

Criteria will be that the chamber and rodding point must be in a straight line of sight. If not, they can ask for you to have rodding access from either side (up and down stream) of it. 

[Lars P]

this is as is :

 

so could simply remove chamber (black cylinder) and add double sealed inspection hole under kitchen sink

 

or

 

remove chamber and replace with the below - of course with a rodding eye fitted on the external end of the pipe. All 200mm radius bends

 

Edited July 30 by Lars P

[saveasteading]

How about remove chamber and link straight through. 

Fit rodding point riser in kitchen. There is another kind with a screwed on cap on the side.

If you go to a merchant (ie not TS/SF) you can handle them.

 

[Lars P]

Splendid - spoke to BCO and Rodding point riser in the kitchen is the way to go - thanks all for your input. Onwards to the next obstruction.

Edited July 31 by Lars P