Problem with new tub and toilet install
Just bought a house built in the 60's and immediately finished a bathroom in the basement. A sink was already installed and a toilet stub was already in place. We had the toilet drain moved a bit and had a bathtub installed.
Problem: when flushing the toilet that is a few feet away from it you can hear noises at the tub drain.
This new bathroom also shares a vent pipe with 2 bathrooms above it.
Option 1: Clogged vent pipe... BUT, If the noises I am hearing are because of the main vent pipe being clogged then why don't I hear them when one of the upstairs toilets are flushed or when any of the other upstairs plumbing is in use.
Option 2: Clog in main drain line... BUT again, why the noises only when that toilet is flushed.
Could there be an option 3... like a mistake or laziness by the plumber?