Nick Brooks wrote:
Hi all

We have gutted our cottage as we are in the process of joining two
together. The new bathroom will be above the kitchen. We are planning
to fit a loo, sink, shower and bath in the bathroom and a sink and
dishwasher in the kitchen.

I'm planning to take the waste from the shower and sink together down
a 40mm pipe and the bath down another 40mm pipe. At what point can
they join the 110 waste from the loo before it goes underground?

what are the relevant building regs?

Does this look like a good plan?


sink shower loo bath
| | | | |
| | | | |
(_______(_______40mm_____| | |
| | |
| | |
| | | sink dishwasher
| | | __)________)
| | |
| | |40 mm
| |_____|_______
|_______________to underground waste

Looks basically ok to me.
Check the charts on the Hepworth site as to what can be combined with what
at what slope.