Using this kind of insulation in a bus is a bad idea. It absorbs and holds moisture.
That moisture comes from leaks, condensation, ect.
Around engines, wood stoves, and other heat sources are the only places you should use this type of insulation.
I just insulated a 500,000 BTU coal boiler with mineral wool. It falls apart easily, absorbs 500 times it's weight in water, and loses it's insulating ability's when wet.
However, unlike fiberglass, it's not itchy.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization