Climate Zones as determined by the Department of Energy Pacific Northwest National Laboratory and adopted by the International Code Council for use in its residential and commercial 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.
Commercial Roof Insulation Recommendations
Zones 1 thru 3
PIMA Recommended R-value – R-20
In climate zones one thru three, insulation can dramatically help to reduce cooling loads and lower energy costs. This is predicated on existing ASHRAE requirements and independent analysis that concludes that additional roof insulation is cost effective, saves energy, reduced pollution and carbon emissions.
Zones 4 thru 6
PIMA Recommended R-value – R-25
In climate zones four thru six, insulation can dramatically help to reduce heating and cooling loads, while lowering energy costs. This is predicated on existing ASHRAE requirements and independent analysis that concludes that additional roof insulation is cost effective, saves energy, reduced pollution and carbon emissions.
Zones 7 and 8
PIMA Recommended R-value – R-30
In climate zones seven and eight, insulation can dramatically help to reduce heating loads, while lowering energy costs. This is predicated on existing ASHRAE requirements and independent analysis that concludes that additional roof insulation is cost effective, saves energy, reduced pollution and carbon emissions.
Wall Insulation Recommendations
Zones 1 thru 3
PIMA Recommended R-value – R-20
In climate zones one thru three, insulation can dramatically help to reduce cooling loads and lower energy costs. This is predicated on existing ASHRAE requirements and independent analysis that concludes that additional roof insulation is cost effective, saves energy, reduced pollution and carbon emissions.
Zones 4 thru 8
PIMA Recommended R-value – R-25
In climate zones four thru eight, insulation can dramatically help to reduce heating and cooling loads, while lowering energy costs. This is predicated on existing ASHRAE requirements and independent analysis that concludes that additional roof insulation is cost effective, saves energy, reduced pollution and carbon emissions.
