Connecting basin and shower wastes

[RKB]

I intend to install a standalone shower in my bathroom and move the basin from its current position to another wall. Is it possible to connect the waste and shower together with 40mm, or will I get problems with the shower trap gurgling when emptying the basin? The sequence would be:

waste through wall / shower / basin

Any other suggestions? I really don't want to take two separate wastes through the wall to the outside stack.

 Thanks

 

[ChrisR]

Separate wastes is the correct way to go. Anything else is likely to give you problems of one sort or another, depending on what measure you take to avoid problems!

 

[Nige F]

Agreed..2 wastes is correct ...but I suggest two Hep v-o waste valves..In my opinion ,the 21st century answer to waste pipe traps. Ask your local plumbers merchant.

 

[JPC]

i'm aware of the issues....but i connected my basin and bath wastes togother and have no syphon problems -re smell etc.
although it does gurgle some
i was going to fit an anti syphon but wont bother now ..unless it does become a problem in the future

 

[ChrisR]

But would you find it acceptable, looking at RKB's case, to have the likeliest trouble - that is basin waste water coming up the shower drain?
No fun to change that if it's not what you want.

A hepv0 waste is a good bit of kit for the application. But to just try it and see wityh normal parts is like crossing the road without looking; even if you get away with it , it's still a daft thing to do!