B.I. Cellulose

[homnspector]

Anybody know offhand the approximate R value of 8 inches of blown in cellulose?

[Chad Fabry]

25 or 26

[homnspector]

Thanks Chad

[Bob White]

http://www.eere.energy.gov/buildings/bu ... /34902.pdf

is the 2002 version of the U.S. Department of Energy's Insulation Fact Sheet.

There's some good info in there, and the table on page 6 helps you calculate R values for different types of insulation.

[homnspector]

Thats a nice reference. I never paid much attention to R value, I think its kind of a useless estimate except to compare different types of insulation and I don't include any R value in a report. I usually just estimate the depth and report on type and depth. This client was very concerned about R value. Kind of like the same way everybody is suddenly concerned about miles per gallon.

[JEuriech]

Most of the time, I find a piece of paper stapled by the hot water heater or just inside the attic access with the insulation information. R-30 is 8.1".

Jeff Euriech

Peoria Arizona

[msteger]

Typically 1" of cellulose = R - 3.5