Moving two bathroom waste pipes to soil stack

[dannyrico]

I want to move my bathroom sink and shower waste pipes to the soil stack.

I'm assuming this is fine, but just want to make sure I'm not missing anything important. Also not totally sure what fittings I should be looking for given the angles at play.

Thanks for any advice!

 

[Elsa TLC]

I see no problem with thst.

 

[denso13]

It's fine, straight in with the sink and a 45 degree bend on the shower.

 

[dannyrico]

Is there any syphoning risk on the sink if I'm attaching to the 45 degree part of the soil stack? I'm planning to use a boss strap, and I know they have the slight angle on them which is sort of pointless since it's a drop straight in from the sink.

 

[denso13]

Is there any syphoning risk on the sink if I'm attaching to the 45 degree part of the soil stack?

Not really, it is far shorter than the existing run..

 

[Hugh Jaleak]

Just ensure you don't make an opposing connection within 200mm of the Centreline of the WC Branch to prevent crossflow. If you cant get the right angle on the sink waste to join into the 45° run on the Soil pipe, you may be able to go across to the Left and join the vertical run with a bit of jiggery pokery.

Use 2 x 45° bends to 'dogleg' out from the wall and line up with the Boss into the Stack.