Toilet + Shower in same downpipe

[russ8585]

Im replacing the bathroom in my new house and found the toilet and shower share the same downpipe. The basin runs to a different stack.

I used to do some plumbing when I was younger and I've never seen this setup. It seems a bit unhygienic. It's an older house so the waste and rainfall downpipes will share one sewer in the street, but I still feel the toilet and shower shouldn't be connected like this. A back up could cause sewage to flood the shower before the toilet (those in theory if it all runs to one sewer in the street, this may not matter).

Should I move the shower waste to another downpipe (basin is using the old bath waste) or is it a waste of time and money?.

 

[denso13]

Should I move the shower waste to another downpipe

No, it's perfectly normal.

 

[oilhead]

I think if that downpipe backed up to the shower level you'd know it before fooding the shower.

 

[Exedon]

As above all normal
It's called single stack.
Pic of one i did this morning.

 

[Hugh Jaleak]

Single Stack system, widely used since the 60's. Provided the smaller appliances are fitted with the correct depth traps, you should never have an issue. Waste pipes into Hoppers are banned unless as a direct replacement for an existing setup.

 

[russ8585]

Thanks all.

 

[russ8585]

Quick question: if I was to connect the basin into the same waste pipe as the shower, how would I avoid the basin syphonig the shower trap. I had this issue in my old flat, but I was on the 3rd floor and I think the fall of the downpipe was a big factor.