Cellulose has a high insulative value, known as "R"
value. It is R-3.6 per inch.We spray cellulose into a 2x4 wall
cavity and get R13. Also, since it is a very high density material, the
resultant air seal stops those nasty drafts and convection currents you
get with just fiberglass batts behind your walls.
insulation is one of the most "Green Friendly"
materials in your house. It is made from recycled newspaper with
fire retardant in it. Follow this link to find out
blown in attics to the proper depth and density, outperforms fiberglass.
Note: Getting Your $$$ Worth
contract someone to add cellulose to your attic, or do it yourself, make
sure you or they follow the recommendations on the bags of
cellulose. It is important to get the correct VOLUME or
BAG COUNT installed. We have gone into new buildings
after another contractor had "Insulated" the attic only to find that the
owners had 1/2 or less the R-Value they were sold. How does this
happen? Simple. Either the contractor just intentionally
undershot the depth of the material, or he CHEATED the
owners by blowing a lot more air into the material which "fluffed up" and
made it appear that he had installed the correct amount. The way to
know if you're getting your dollars worth is to ask the contractor
BEFORE he installs the insulation what he estimated the
amount should be. Also the quantities of bags per 1000 square foot
of area is printed RIGHT ON THE BAG.