Dont feel bad we got a 2012 and when I looked into the overhead behind all the stereo stuff found NO INSULATION. Company responded with a reply that a minimal amount is applied! It is a huge heat source for the inside of the coach and to fix I need to pull the cabinets out and try to install something? Again the maker was of no help. talked to a guy at an rv shop he agreed that the rolled foil stuff would work and we batted ideas around on how to secure it.
You would think for the prices of these that there would be some quality work involved by the major manufacturers particularly on their more $$ models!