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Current R-Value Calculator

R-Value Map

Please use the map and table below to determine the recommended R-Value for your area.

US DOE Map
Zone U.S. DOE Recommended R-Value Range
1 R30-R49
2-3 R38-R49
4 R38-R60
5-8 R49-R60

Map Notes:

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.


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Want to learn more about R-values? Click here.

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