I am reviewing the requirements of the new Maine Uniform Building and Energy Code that goes into effect 12/1/2010. The required R value for a wood framed wall is R20. If I assume the Dense Packed Cellulose has an R value of 3.4 per inch and a 2x6 is really only 5.5" deep, then 5.5" of cellulose is only R18.7 which doesn't quite meet the standard.
I could put in R21 fiberglass and meet the standard, but I am sure the cellulose would out perform the glass in the real world.
How does everyone else view this subject?