e of interest sufficiently, condensation from interior water vapor migrating into the wall assembly does not occur. This allows assemblies to be constructed in cold climates without interior vapor control layers. The building codes recognize this and provide guidance on the minimum thermal resistance values of rigid insulation required to control condensation, when Class I and II vapor retarders are replaced with Class III retarders in specific regions.
56 Table 5 is information taken from Table R Class III Vapor Retarders of the 2009 IRC and Table R Class III Vapor Retarders of the 2012 IRC and provides guidance for thermal resistance values to control condensation for Climate Zones 5, 6, 7, 8 and Marine 4. Table 5. Thermal resistance values to control condensation for climate zones 5, 6, 7, 8 and marine 4 from (2009 IRC and 2012 IRC).
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