High solar reflectivity roof membranes have been a focal point of energy saving efforts in building design. These efforts have been codified in the International Code Council (ICC) International Energy Conservation Code (IECC) and the American Society of Heating and Air-Conditioning Engineers (ASHAE) Standard 90.1 Energy Standard for Buildings Except Low-Rise Residential Buildings. In both of these texts prescriptive aged and or initial roof membrane solar reflectivity is specified. This paper reports the numerical findings of this study, examines causation for the differential levels solar reflectivity values discovered and proposes guidelines for roof membrane solar reflectivity used for design and modeling.
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