Blowing cellulose over fiberglass is a bad idea if you don't want mice in your house. Mice love fiberglass for some reason. They don't really like cellulose though. So if you put R 41 of cellulose on top of fiberglass you are effectively creating a very warm and cozy space for them to bed down. In my experience this ALWAYS happens. I have never seen an exception. No amount of cats in a house will keep them out in the winter. And I also highly recommend cellulose. Forget cost. It's better for any other number of reasons. The only, ONLY, benefit I see to other forms of insulation is that the foams have a higher R value. Cellulose has so many perks that there is literally thousands of pages written about it.
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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