Energy Code/R-Value Map - Canada
Energy Code/R-Value Map - United States

Energy Code/R-Value Map - Canada

All Canadian Climate Zones
Recommended Minimum Roof Insulation: R-40
In all Canadian climate zones, insulation can dramatically help to reduce heating loads, while lowering energy costs and reducing pollution and carbon emissions.

Recommended Minimum Wall Insulation: R-30
In all Canadian climate zones, insulation can dramatically help to reduce heating loads, lower energy costs, and reduce pollution and carbon emissions.

Minimum R-Value Map - United States

The Climate Zones shown here have been determined by the U.S. Department of Energy at the Pacific Northwest National Laboratory and have been adopted by the International Code Council for use in its building codes.

All of Alaska is in Zone 7 except for the following Boroughs which are in Zone 8: Bethes, Dellingham, Fairbanks N. Star, Nome, North Slope, Northwest Arctic, Southeast Fairbanks, Wade Hampton, Yukon-Koyukuk. Zone 1 includes Hawaii, Guam, Puerto Rico and the Virgin Islands.

The following recommendations are the MINIMUM roof insulation recommendations shown in the latest draft of ASHRAE Standard 189: Standard for the Design of High-Performance Green Buildings Except Low-Rise Residential Buildings (February 2008). This Standard recognizes that durable energy efficiency is an essential element of any green building effort.

Zone 1
PIMA Recommended R-value - R-20
In climate zone one, insulation can dramatically help to reduce cooling loads, lower energy costs and reduce pollution and carbon emissions.

Zones 2 thru 5
Recommended R-value - R-25
In climate zones two thru five, insulation can dramatically help to reduce cooling and heating loads, lower energy costs. and reduce pollution and carbon emissions.

Zone 6
Recommended R-value - R-30
In climate zone six, insulation can dramatically help to reduce heating and cooling loads, lower energy costs and reduce pollution and carbon emissions.

Zones 7 and 8
Recommended R-value - R-35
In climate zones seven and eight, insulation can dramatically help to reduce heating loads, while lowering energy costs, and reduce pollution and carbon emissions.

Zone 1 Recommended Roof R-value: R-20 In climate zone one, insulation can dramatically help to reduce cooling loads, lower energy costs and reduce pollution and carbon emissions.

Zones 2 thru 5 Recommended R-value - R-25 In climate zones two thru five, insulation can dramatically help to reduce cooling and heating loads, lower energy costs and reduce pollution and carbon emissions.

Zone 6 PIMA Recommended R-value - R-30 In climate zone six, insulation can dramatically help to reduce heating and cooling loads, while lowering energy costs and reduce pollution and carbon emissions.

Zones 7 and 8 PIMA Recommended R-value - R-35 In climate zones seven and eight, insulation can dramatically help to reduce heating loads, lower energy costs, and reduce pollution and carbon emissions.

Climate Zone Definitions
The climate regions shown here are based on those in ASHRAE Standard 169 and shown here by reference from ASHRAE Standard 189.