Biggest takeaway-Make sure to use sound barrier caulk between the ceiling and wall, NOT drywall mud so that the sound vibrations do not travel easily to the wall thus transfering the sound and you hearing it there instead.

I wonder how much vibration they feel/hear below when that old sucker fires up :) If you decide to buy the property I would definitely move the fce to the floor below just to ensure reasonable heating bills that will keep the unit rented.

It could have been a bad patch or previously damaged and then some new stress, temperature, shaking, vibration, etc could have caused it to fall.

Omg, don't forget the thunderous vibrations that tenant will have to endure all times of the day and night year around when they are trying to sleep in order to get up and go to work to earn enough money to pay rent...

The ring you turn to clamp the disposal to the sink might not have been pulled all the way tight and vibrated loose.

The floor will still carry the vibrations so a carpets floor may help but then you have the issues with carpet maintenance.

Over that we strap the wall/ceiling with resilient channel - the resilient channel both provides better hold for the sheet rock in the event of a fire {i.e. ceiling stays up longer} and, by suspending the drywall off the floor joist reduces the low frequency sounds/vibrations from the floor above {i.e. running little kids or pets}.  

Can you feel a vibration of thumping base or screams from an action movie?

And the thought was I would deal with that later.This laundry room is in the basement and the carpet and total space that had to have water restoration twice was all in the basement.I'm pretty sure the tenant glued the screws in place and eventually I had my contractor drill the screws out after the tenant had vacated.After the second back up I was very suspicious, of course, and after he had moved out I spent $108 again to have the rooter man destroy the grate and go in the relief hole that joins the main drain line behind the trap with a smaller rooter and vibrate the heck out of whatever he gets his rooter in behind.

Its been a god-awful couple months for me personally full of heartache and loss, and I need some positive vibrations in my life.