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Not enough angle on Waste

View the thread, titled "Not enough angle on Waste" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Evening All,

Looking for some advice.
Doing a bathroom refit at the moment where there is an internal cast iron soil stack.
Bathroom waste inlet to that soil stack sit quite higher. I am already pushing the height of the bath to high in my opinion (560mm), and I am barely getting any slope.

Not sure what to do?

One option I was wondering was that I could drop through the floor board, along the joist at an angle (no cutting needed), down the side of the soil stack and Tee close to the inlet for the ground kitchen.

Is this an option? And if so, do I need to prevent a back flow to the kitchen sink / appliances?

Cheers
Rusty
 
I don't think I can, as there are a series of joints where the toilet waste connector to the stack, so I would end up drilling in to a joint.
Only option for a new branch would be do as post 1, but further up thr stack in the kitchen (so a separate branch rather than T'ing to kitchen waste)
 

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