@article{25719,
  keywords = {Residential, Solar, Scattering, Metal, Absorption, Coating, Heat Island, Asphalt shingle, Concrete tile, Roofing, Methods & Protocols, Clay tile, Conversion coating, Near-infrared, Pigment, Reflective, Treatment, Wood},
  author = {Ronnen M Levinson and Paul H Berdahl and Hashem Akbari and William A Miller and Ingo Joedicke and Joseph C Reilly and Yoshi Suzuki and Michelle Vondran},
  title = {Methods of creating solar-reflective nonwhite surfaces and their application to residential roofing materials},
  abstract = {<p>We describe methods for creating solar-reflective nonwhite surfaces and their application to a wide variety of residential roofing materials, including metal, clay tile, concrete tile, wood, and asphalt shingle. Reflectance in the near-infrared (NIR) spectrum (0.7-2.5 μm) is maximized by coloring a topcoat with pigments that weakly absorb and (optionally) strongly backscatter NIR radiation, and by adding an NIR-reflective basecoat (e.g., one colored with titanium dioxide rutile white) if both the topcoat and the substrate weakly reflect NIR radiation. Coated steel and glazed clay-tile roofing products achieved NIR reflectances of up to 0.50 and 0.75, respectively, using only cool topcoats. Gray-cement concrete tiles achieved NIR reflectances as high as 0.60 with coatings colored by NIR-scattering pigments. Such tiles could attain NIR reflectances of up to 0.85 by overlaying a white basecoat with a topcoat colored by NIR-transparent organic pigments. Granule-surfaced asphalt shingles achieved NIR reflectances as high as 0.45 when the granules were covered with a white basecoat and a cool color topcoat.</p>},
  year = {2007},
  journal = {Solar Energy Materials and Solar Cells},
  volume = {91},
  number = {4},
  pages = {304-314},
  month = {02/2007},
  doi = {10.1016/j.solmat.2006.06.062},
  language = {eng},
}