bathroom drainage

[kbuck]

I am in the process of installing a new bath and sink (re siting) in an existing bathrom. The original sink and bath wastes drained independently to a stack outside the house (soil stack also). The new location of the bath and sink is such that I want to have only one drainage point to the outside stack and to plug up/disconnect the other one.

Are there any problems having the bath and sink waste emptying into the same waste pipe and hence into the outside stack? The bath is freestanding with a shallow waste - the bath and sink are about 1m apart.

Thanks

 

[Expertboy]

You cuold get away with this but if your bath is on the run after the sink and you were to empty them both together, your sink would drain very slowly.

Also your sink is 32mm and your bath is 40mm on the waste so you will need to modify your waste pipe to suite.

 

[kbuck]

The bath will be upstream from the sink - will this be okay?

 

[Expertboy]

The bath will be upstream from the sink - will this be okay?

Again should be ok.

 

[bster]

You will probably suffer from induced siphonage of the basin (trap gurglings) when the bath is emptied depending on pipe sizing and runs.

 

[kbuck]

Are there any building regs regarding waste pipes (sink/bath) etc being behind plasterboard?

Thanks