I removed the side wall panels on my 2000 International (Bluebird) and the insulation was about an inch and a half of fiberglass insulation - relatively dense. I found that the side panels have small holes at the bottom - which I am guessing were just put there to annoy me (maybe to drain water?) - so the insulation was wet on the side panels.
The ceiling is the same insulation - I decided to leave that.
I hope that helps.
Originally Posted by Horsedriver
How much insulation is in the ceiling of your average 2000 school bus if there is any.