Had a new toilet installed and they replaced the vent/air stack. Problem is they used 100mm instead of 50mm like every other house on the street. They explain it helps toilet flush better? Comments please?

Linkback: https://www.plumbers.nz/q-and-a-toilets-wc-bidets/62/airvent-stack/1705/

You bring up a valid point,only wish the plumbing investigator we had to bring in had put that in his report. Is the plumber responsible for repairing the flashing surrounding the pipe?

Please check out my other posts for other issues and pictures. Feedback is always appreciated

Inspector as been looked at work listened to our issues but seemed more intetested in mediating a settlement between contractor behind our back because we refuse to pay remaining half of their $10k quote. His report found no issues with any of the work and with 25 years behind him the mediator in the disputes tribunal found in the  contractors favour.