Back to back toilets

[neilinbal]

Hi all
I'm considering changing a bedroom into a family bathroom. The bedroom backs onto a ensuite so all the pipework is there & easily accessible. Problem is the toilets. I'd have 1 in the middle of the bedroom wall & 1 offset on the other side in the ensuite. My question is will this cause problems if I T them into the same pipe (I have no other options). Please see crap drawing.
Cheers

 

[Hugh Jaleak]

I don't see an issue teeing into same pipe, provided it has adequate fall to the stack. I would try and offset the pans though, dead opposites could cause an issue with contents of one pan crossing over to the other when flushed, hence the need to offset.

 

[neilinbal]

Cheers mate
I'd been told I'd have same problem just using a T into horizontal pipe as they'd only be offset by a couple of hundred mm at most. You don't think when 1 toilet flushes other will start bubbling?
Thanks for your help

 

[Madrab]

As @Hugh Jaleak mentions, as long as they are staggered on the horizontal run and the fall is adequate towards the stack and it's 110mm soil pipe then there should be no issues with cross flow or syphoning.

 

[gas112]

just put anti rodent traps into them to stop playing sh#te ping pong , basically a flap with a spring on it so nothing can come back into pan
https://www.bellabathrooms.co.uk/mcalpine-arb-1-anti-cross-flow-and-rodent-barrier-valve.html

 

[neilinbal]

Sounds good
Thanks all.