Adding to existing blown-in fiberglass insulation
I am located in climate zone 5, bordering 6. I have remedied sealing and kneewall issues in my attic. I am ready to add additional blown-in insulation to the existing blown in fiberglass (R-38). My plan is to bring the final R value to R-60. If I currently have blown-in fiberglass, is there any benefit to adding cellulose over the top or just top it off with additional blown fiberglass?