Thanks for your input. Insulating the roof will be a chore. The interior ceiling is gabled up with no access to the attic. I am going to put a new roof on within the next couple months and am going to try removing some of the slat decking and fill the roof cavities from the outside. I think this will work but am not sure.

Any feedback? I really don't know what else to do about insulating the space.

Also, what about an "ulta zone" system? I do not know anything about this stuff, but am curious based on their website.