THERMAX Wall System – Requirements per Zone


In six out of eight U.S. climate zones, continuous insulation (ci) is no longer simply a value-added option, it's required, according to ASHRAE 90.1-2007. And although the requirements reference using fiberglass insulation to achieve minimum R-values, they now recognize the value of continuous insulation. What's more, design professionals across the country are beginning to realize that continuous insulation alone can achieve specified R-values and optimum moisture control.

The prescriptive path to meeting the ASHRAE 90.1-2007 requirements outlines specific configurations for the various geographic locations or zones that must be used to meet the code requirements for walls, roofs and fenestrations (see map for zone locations). By simply varying the thickness of THERMAX™ (ci) Exterior Insulation to maintain prescribed U-factors, the THERMAX™ Wall System can meet ASHRAE 90.1-2007 building envelope requirements for all U.S. climate zones.

North America Zone Map

Code Table 

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