%0 Journal Article
%K Residential
%K Solar
%K Scattering
%K Metal
%K Absorption
%K Coating
%K Heat Island
%K Asphalt shingle
%K Concrete tile
%K Roofing
%K Methods & Protocols
%K Clay tile
%K Conversion coating
%K Near-infrared
%K Pigment
%K Reflective
%K Treatment
%K Wood
%A Ronnen M Levinson
%A Paul H Berdahl
%A Hashem Akbari
%A William A Miller
%A Ingo Joedicke
%A Joseph C Reilly
%A Yoshi Suzuki
%A Michelle Vondran
%B Solar Energy Materials and Solar Cells
%D 2007
%G eng
%N 4
%P 304-314
%R 10.1016/j.solmat.2006.06.062
%T Methods of creating solar-reflective nonwhite surfaces and their application to residential roofing materials
%V 91
%8 02/2007
%X <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>