I currently have fiberglass batt insulation of about 6 inches (in some spots less than that closer to 3 inches) due to a cleanout necessitated by rodent activity which has been hopefully remedied.
I have encountered the following recommendation:
"If you have cellulose, fiberglass above is ok, never let anyone blow cellulose over fiberglass. Batts or blown."
Can you please explain the reason for this and what is the best choice to put over the fiberglass batt. My research concludes that blown-in cellulose would provide better overall insulation vs. fiberglass for both temperature and sound factors. I am also on a slope and more exposed to fire risk and the cellulose has a borate fire retardant whereas I would not get that protection with fiberglass.