Currently have separate loo upstairs, the bathroom next door has lots of room for an additional loo (3 girls + wife, beleive me we need it)
Downstairs loo not really an option without a lot of digging round the side of the house so ....
Can I plumb a 2nd upstairs loo into the same soil pipe as the original upstairs loo? ta
Yup. I've seen commercial premises with many WCs all on the same standard soil pipe.
Yup, there is some guidance in the building regs as to what to do:
Depends a bit on which side the stack is. It's not too bad putting two toilets on the *same* side of the stack (have a look at the loos in your local supermarket next time you visit) - but putting them on opposite sides of the stack could prove a bit more tricky. You'd need to break into the stack and replace a single branch with a double branch, if such a thing exists - I've had a quick look on-line, and can't find any 110mm double branches!
They're definitely available, many new houses near here have them for their en-suite.
Good stuff! Still a bit of a fun job, installing in an existing stack, though!
Vass wrote: I plumb a 2nd upstairs loo into the same soil pipe as the original
Yes, but expect interference from the pen-pushers.
Why? If the two come in on a double branch, no problem. If the two come into branches on the same side, no problem. If they come in from opposite sides at different levels there is a minimum separation (200mm IIRC) to stop the flow from the higher one going up the lower one.
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