Installing upstairs toilet soil stack

[kjsmith1701]

I have installed a toilet upstairs and completed all the pipework, I am now ready to run the soil stack down in line with the downstairs wc. Can I run the upstairs toilet soil pipe directly (which runs straight down) into the downstairs toilet connections via a u-bend to discharge into the main (not the d/s toilet)(which would be a lot easier than breaking up concrete to find the mains) or do I have to connect it to the main sewer pipe? would appreciate any advice, many thanks.

 

[joni os]

If you can connect D/S toilet into side of Tee piece then U/S can be connected into vertical part of Tee. Use Tee again for U/S connection, rise above basin level and finish with AAV.(Air Admittance Valve).

 

[kjsmith1701]

That's great thank you for your advice and replying, sorry to trouble you further but will this all be okay with building regs? thanks kate.

 

[Riley]

Do you mean is it correct or do you have to notify building control?

 

[kjsmith1701]

The d/s wc soil connection is on the inside and goes straight down under the floor, there is no external soil pipe other than what I am installing. My preferred option is to run the soil pipe from upstairs vertically down in line with the d/s wc and then connect to the vertical of a tee (as suggested by joni os) however as the soil for d/s wc is inside, I would have to run down vertically then come in to fit the top of the tee via a bend - this is the bit I am unsure of as I have been advised that there should be no bends?? I want to sell the house when all the work is done so would not want anything flagged at that stage. any advice really appreciated - many thanks kate

 

[Riley]

I think I know what you mean but it's difficult to picture without a photo or diagram. If you can post one then that would help. Other alternative is speak to building control as I believe they must be notified about a w/c upstairs that wasn't there before.