stephanhg

Thank you Mark! Okay, my apologies - either way I do need pointing in the right direction, so if you do know of a better alternative forum for my sort of question, that would be greatly appreciated? These are just flats, not a hostel. So the load factor won't be quite as frequent. What are your thoughts?

Apologies if this is an obvious one. I've been searching all through internet, building standards, NBS and everywhere and couldn't find a conclusive answer. I'm aware for an individual flat or house a main wastewater drain would be c. 110m diameter. Would you suggest 160mm diameter when multiple flats run into it? (See the attachment) Thanks a lot in advance! Stephan