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diplomat
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5,292 Posts
Cchrc.org has both cellulose and fiberglass in their roof installed to r60 per manufacturer, full of sensors. The cellulose is performing much better.

Fiberglass is much more pleasant to install, but cellulose air seals better. For retrofit, the air sealing can be a big benefit. In walls the fiberglass air seals much better than it does in ceilings because it is much denser.

Regarding payback periods, in colder climates they can range from quick to almost never, but the added comfort can be worth something too.
 

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diplomat
Joined
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5,292 Posts
I believe, may be wrong, that cellulose reaches its R-value once it's settled. On initial application it is fluffy and full of air. Once it settles, it is denser. Our installer blows more than needed to allow for settling. We use cellulose in almost all of our attics.
Yes, it has an installed thickness and a settled thickness specified.
 
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