I'm moving my bathroom to the adjacent corner in my house, and would like to know if I need to vent my soil pipe with my planed system before it reaches the existing external soil stack. Going directly through the floor is not possible as drilling holes through the joist will weaken them. Also, I can not exit out the rear of the property.
So my plan was to allow my toilet to connect directly down into a manifold so sink and shower can connect too. From there the pipe will travel vertically for approx 2.4 meters, then to a couple of 45 elbows to bring the pipe work to horizontal and to offset no more than 200mm, then it would run for approximately 4.5 meter before connecting into the external stack.
Does this branch require venting from the bathroom end?
If so can it be done internally with some kind clever vent?