We have 6 inches of cellulose insulation in our attic. After air and duct sealing we are going to add another 12 inches or more of additional insulation.

Been getting quotes on both blown-in fiberglass and cellulose. Is fiberglass OK? Been reading that it is about 20 to 30 percent spun glass. What is the remaining 70 to 80 percent. Air? or other stuff?

If this was your home.......what would you do?

Thanks