Not enough angle on Waste

[Rustyh]

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

 

[ShaunCorbs]

Can’t you drill another boss into the stack lower ?

 

[Rustyh]

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)

 

[ShaunCorbs]

Any pictures of the stack ?

 

[Rustyh]

Hopefully these photos work

 

[Rustyh]

Forgot to say,
Two photos are of the stack from the bathroom, the other two are from the kitchen underneath

 

[ShaunCorbs]

You might be able to just get into the toilet elbow piece on the middle eg between the stack and the bend