Can this work? Join Washbasin Waste Pipe with Bath Waste Pipe

[DaveFix]

Hi all,

When I install the WC against the wall, the waste pipe from the washbasin will be in the way. I'm trying to reduce the amount of unnecessary / visible pipework anyway.

My question is: If I feed the washbasin waste pipe straight down and join onto the bath waste pipe, am I likely to get water coming up into the bath when emptying a sink full of water? If so, is there a valve-like product I can fit to the pipework to stop that happening?

 

[Hugh Jaleak]

Fit an anti vac trap on the basin to stop bath pulling basin trap, and fit a non return or HepVo valve on the bath waste before the basin joins it.

 

[just pumps]

Or feed the basin pipe to the wc pan connector (McAlpine do one).

 

[Elkato531]

Just drop the basin waste and Tee into the bath waste. Very unlikely the basin would back fill into the bath from this arrangement unless there was a blockage downstream of the connection. Antivac trap on the basin a good idea.

 

[just pumps]

Just drop the basin waste and Tee into the bath waste. Very unlikely the basin would back fill into the bath from this arrangement unless there was a blockage downstream of the connection. Antivac trap on the basin a good idea.

Use the wc pan connector and there is no very unlikely about it!

 

[Elkato531]

Use the wc pan connector and there is no very unlikely about it!

True. Just a bit neater if basin waste pipe is hidden behind pedestal.

 

[DaveFix]

I'm going with Hugh Jaleak's suggestion because it reduces the visible pipework as per the original question. Thanks to everyone who answered, even if I didn't choose your solution, by showing me what all the other options are you helped me make a more informed decision.