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Title
New Generation Solar Reflective Shingles
New Generation Solar Reflective Shingles
Date
9/2011
9/2011
Author(s)
Ming Shiao; Husnu Kalkanoglu
Ming Shiao; Husnu Kalkanoglu
Page(s)
Keyword(s)
asphalt shingle; roofing granule; cool roof; solar reflectance; weathering; color; aging; aesthetics; coating; cool pigment
asphalt shingle; roofing granule; cool roof; solar reflectance; weathering; color; aging; aesthetics; coating; cool pigment
Abstract
Increasing energy costs and global warming have created strong demand for cool roofs that can reduce summer cooling energy for indoor comfort while reducing carbon footprints. Using white or light surface colors, a roof’s solar reflectivity can be increased and a “cool roof” can be achieved. However, for many homeowners with asphalt shingles on their homes, color matters. Therefore, a new solution must be found so both requirements—energy management and aesthetics—can be fulfilled. This paper discusses a new generation of shingles whose solar reflectivity does not depend on their light-colored surfaces. On the contrary, these shingles exhibit vivid, dark colors yet possess solar reflective behavior similar to their light-colored counterparts. The paper will present results on improving their shingles’ solar reflectance through earth tone-colored roofing granules that achieve high solar reflectance. The microstructure/property relationships for these new solar reflective roofing granules will be presented and discussed to shed light on the potential benefits of enhancing solar heat reflectivity without sacrificing color strength. Field test data also will be presented; the results revealed these new generation solar reflective shingles can retain their solar reflectance after three years of outdoor weathering in various climates.
Increasing energy costs and global warming have created strong demand for cool roofs that can reduce summer cooling energy for indoor comfort while reducing carbon footprints. Using white or light surface colors, a roof’s solar reflectivity can be increased and a “cool roof” can be achieved. However, for many homeowners with asphalt shingles on their homes, color matters. Therefore, a new solution must be found so both requirements—energy management and aesthetics—can be fulfilled. This paper discusses a new generation of shingles whose solar reflectivity does not depend on their light-colored surfaces. On the contrary, these shingles exhibit vivid, dark colors yet possess solar reflective behavior similar to their light-colored counterparts. The paper will present results on improving their shingles’ solar reflectance through earth tone-colored roofing granules that achieve high solar reflectance. The microstructure/property relationships for these new solar reflective roofing granules will be presented and discussed to shed light on the potential benefits of enhancing solar heat reflectivity without sacrificing color strength. Field test data also will be presented; the results revealed these new generation solar reflective shingles can retain their solar reflectance after three years of outdoor weathering in various climates.