Current R-Value Calculator
Please use the map and table below to determine the recommended R-Value for your area.
Zone 1 includes Hawaii, Guam, Puerto Rico, and the Virgin Islands.
All of Alaska is in Zone 7 except for the following Boroughs in Zone 8: Bethel, Dellingham, Fairbanks N. Star, Nome, North Slope, Northwest Arctic, Southeast Fairbanks, Wade Hampton, and Yukon Koyukuk.
|Zone||U.S. DOE Recommended R-Value Range|