Connecting new utility & toilet space to existing drainage??

Hi, I'm looking for some advice / guidance on a project we are considering.

We are considering putting a new utility and toilet space downstairs. In order to do this we would need to run the waste pipes backwards, circa 2 metres, to join the existing waste drainage which joining waste from upstairs bathroom and kitchen; then flows out to the main drains out to the street.

First question - is it possible to run the flow backwards to join the existing drainage?

Then, if so, can you provide some guidance on how best do to so.

Thanks in advance for any help.

Thanks

 

Backwards? A rough sketch or photos may help, but I’m thinking you mean something else?

 

Hi Chris - here is an image (please excuse the drawing) and as you can guess I'm not a plumber!! Thanks.

 

Yes this is fine, just need to cut into existing soil pipe (if that’s what existing is) with a branch.

 

That is great news! Thanks Chris. With regards to a connect to the existing soil pipe would I use a multi point boss pipe and is there any requirement on angles at all?

 

Worth pointing out that this work is notifiable to Building Control, so you'd be well advised to get them involved as soon as you decide to go ahead.

 

No, better using a soil branch, as for falls, 18mm per metre, minimum. Have a look at downloading building regulations document H.

 

Thanks muggles; we have BC engaged already on the extension work already so will make sure to raise with them.

 

Perfect Chris; I downloaded that earlier; bit of a read! Really appreciate your help.

 

Thanks, I wasn’t aware. I’m guessing because of my employer, all of this would have been dealt with by them, for works I did as a plumber.

 

Assuming the existing run as shown in Green is underground, then you wont be allowed (or wise) to connect a WC on a blind junction, as you'll have no method of clearing the WC branch run should it block. Believe me, removing the pan to clear from the top end is NOT something you'd ever want to do.

Does the existing sewer run externally as shown across the top of the diagram? You'd be better off going straight through the wall and making a connection onto the run there, probably with a chamber. Wastes can easily be connected via boss connections or externally via a gulley.