2 WC's, 1 waste pipe? All aspects of plumbing questions and answers, help, tips and information

[noodle]

Could anyone tell me if it's possible to have 2 WC's, back to back either side of a partition wall, running from a single waste pipe into the stack.

I want to build an en-suite adjacent to the existing bathroom, and wondered if I needed 2 waste pipes from the soil stack or if I can use the existing WC waste pipe and attach the new WC to this.

All help appreciated! Thanks.

[plumbbob]

It is quite reasonable to use two WC into one soil pipe provided the falls are arranged to prevent one flushing into the other.