Toilet stack pipe

[Andy Morrison]

I intend installing an en-suite in a bedroom.

Waste from new toilet will go straight through & down the wall then underground to meet the waste pipe from the existing toilet.

Question is, do I need a new stack for new soil pipe or will existing stack serve both old & new toilets?

cheers

Andy

[Alex]

you will need to vent this new waste ,or you could cause your self some problems,a new stack though may not be needed with modern vent systems

[Andy Morrison]

Thanks for the reply.

So how would I go about it then?

Andy.