installing waste pipe in footings Drainage and wastage systems and plumbing help, advice and answers

[dougs1]

i am doing a self build project and have planed to have tollets situated against internal walls. can i run a 110mm soil pipe from an internal wall, under the sub-floor (not poured yet) and then out through the wall? or do tollets need to be againt external walls ??

[dckidd]

Toilets do not have to be against external walls. If you have bends, junctions etc in you waste pipe then you may need a manhole, we have one with a trap door above it for access. If you need a manhole it will need a double seal to stop any smells. I would suggest you ask your building inspector (if he/she is any good) but if the run is straight then I doubt you will have to do anything special.