Spitting toilet, new installation

View the thread, titled "Spitting toilet, new installation" which is posted in Boiler Advice Forum on UK Plumbers Forums.

A

Angus28401

Built new bathroom on second floor, but the toilet spits back occasionally when flushed.
I think this is a venting issue. Attached is a diagram.
Can anyone see any problems with the configuration?

Thanks
 

Attachments

  • plumb (2).jpeg
Pipes look undersized. Is stack open to the air or just an AAV?
Or could it be bouncing off underfloor bend? Are you sure WC branch falls to the stack?
 

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