Correct fitting for soil stack under floor

[SimonG]

most new builds i see are far from perfect. In fact you would be mad to buy many of them sadly.

I think you're being very generous with that statement AW. New builds are atrocious, unless its a one off. Give me an old stone house any day.

 

[spanner]

Asfor the notch I'd agree the depth is way hay out max is ..As for the diameter through the joist and discontinued waste the depth maximum is 1/4 of depth of joist maximum and 1.8m Ithink..As for venting the stack would not be a bad idea. as this causes poor runaways. Could you not removethe drain plug and use the old 100mm soil stack AAV ....