Insulation, Radiant and Vapor Barriers - Attic insulation

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dan619fan
03-28-05, 08:12 PM
When puting blow-in insulation in an attic, how much r-value is in an inch of insulation? Ive heard 3.1 r-value= 3.7 inches and 3.7 r-value= 1 inch. I Do not know witch one to go by. Dose anyone have any info?

thanks.

twelvepole
03-29-05, 11:13 PM
Blown Pink or Yellow Fiberglass 2.2
Blown White Fiberglass
(certainteed Insulsafe) 2.8
Blown Rockwool 2.8
Blown Cellulose 3.7