homnspector Posted July 10, 2007 Report Share Posted July 10, 2007 Anybody know offhand the approximate R value of 8 inches of blown in cellulose? Quote Link to comment Share on other sites More sharing options...
Chad Fabry Posted July 10, 2007 Report Share Posted July 10, 2007 25 or 26 Quote Link to comment Share on other sites More sharing options...
homnspector Posted July 10, 2007 Author Report Share Posted July 10, 2007 Thanks Chad Quote Link to comment Share on other sites More sharing options...
Bob White Posted July 10, 2007 Report Share Posted July 10, 2007 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. Quote Link to comment Share on other sites More sharing options...
homnspector Posted July 10, 2007 Author Report Share Posted July 10, 2007 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. Quote Link to comment Share on other sites More sharing options...
JEuriech Posted July 10, 2007 Report Share Posted July 10, 2007 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 Quote Link to comment Share on other sites More sharing options...
msteger Posted September 9, 2007 Report Share Posted September 9, 2007 Typically 1" of cellulose = R - 3.5 Quote Link to comment Share on other sites More sharing options...
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