As part of renovating our first floor bathroom, I'm going to chop out the cast iron soil & vent pipe, and replace the relevant bits with newfangled PVCu (via an adapter) from the room below. There is a toilet, basin and bath connected at floor level to the SVP, with no other connections anywhere else. I had planned on using a Durgo, rather than through the roof at present (the 4th/5th house, end-of-row constraints are ok in my case).
However, I think I might use Hepworth HepVO traps on the basin and bath instead, and not bother with the Durgo at all. Assuming I do this, is it ok to connect the bath & basin wastes to the SVP just below the toilet branch? Or do they need to be above/level with the toilet branch?
Another point, would it be ok to use a single 40mm waste branch, and then tee to the basin and bath, or should each have it's own branch from the SVP?
I suppose I could just give Hepworth a call, but I thought I'd check here first :-)
Creaky