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Title: A novel technique for the production of cool colored concrete tile and asphalt shingle roofing products

Abstract

The widespread use of solar-reflective roofing materials can save energy, mitigate urban heat islands and slow global warming by cooling the roughly 20% of the urban surface that is roofed. In this study we created prototype solar-reflective nonwhite concrete tile and asphalt shingle roofing materials using a two-layer spray coating process intended to maximize both solar reflectance and factory-line throughput. Each layer is a thin, quick-drying, pigmented latex paint based on either acrylic or a poly(vinylidene fluoride)/acrylic blend. The first layer is a titanium dioxide rutile white basecoat that increases the solar reflectance of a gray-cement concrete tile from 0.18 to 0.79, and that of a shingle surfaced with bare granules from 0.06 to 0.62. The second layer is a 'cool' color topcoat with weak near-infrared (NIR) absorption and/or strong NIR backscattering. Each layer dries within seconds, potentially allowing a factory line to pass first under the white spray, then under the color spray. We combined a white basecoat with monocolor topcoats in various shades of red, brown, green and blue to prepare 24 cool color prototype tiles and 24 cool color prototypes shingles. The solar reflectances of the tiles ranged from 0.26 (dark brown; CIELAB lightness value L* =more » 29) to 0.57 (light green; L* = 76); those of the shingles ranged from 0.18 (dark brown; L* = 26) to 0.34 (light green; L* = 68). Over half of the tiles had a solar reflectance of at least 0.40, and over half of the shingles had a solar reflectance of at least 0.25.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Environmental Energy Technologies Division
OSTI Identifier:
986314
Report Number(s):
LBNL-3813E
Journal ID: ISSN 0927-0248; SEMCEQ; TRN: US201017%%198
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Solar Energy Materials&Solar Cells
Additional Journal Information:
Journal Name: Solar Energy Materials&Solar Cells; Journal ID: ISSN 0927-0248
Country of Publication:
United States
Language:
English
Subject:
14; ABSORPTION; ASPHALTS; BACKSCATTERING; COLOR; CONCRETES; GREENHOUSE EFFECT; LATEX; PRODUCTION; RUTILE; SPRAY COATING; TITANIUM

Citation Formats

Levinson, Ronnen, Akbari, Hashem, Berdahl, Paul, Wood, Kurt, Skilton, Wayne, and Petersheim, Jerry. A novel technique for the production of cool colored concrete tile and asphalt shingle roofing products. United States: N. p., 2009. Web.
Levinson, Ronnen, Akbari, Hashem, Berdahl, Paul, Wood, Kurt, Skilton, Wayne, & Petersheim, Jerry. A novel technique for the production of cool colored concrete tile and asphalt shingle roofing products. United States.
Levinson, Ronnen, Akbari, Hashem, Berdahl, Paul, Wood, Kurt, Skilton, Wayne, and Petersheim, Jerry. Fri . "A novel technique for the production of cool colored concrete tile and asphalt shingle roofing products". United States. https://www.osti.gov/servlets/purl/986314.
@article{osti_986314,
title = {A novel technique for the production of cool colored concrete tile and asphalt shingle roofing products},
author = {Levinson, Ronnen and Akbari, Hashem and Berdahl, Paul and Wood, Kurt and Skilton, Wayne and Petersheim, Jerry},
abstractNote = {The widespread use of solar-reflective roofing materials can save energy, mitigate urban heat islands and slow global warming by cooling the roughly 20% of the urban surface that is roofed. In this study we created prototype solar-reflective nonwhite concrete tile and asphalt shingle roofing materials using a two-layer spray coating process intended to maximize both solar reflectance and factory-line throughput. Each layer is a thin, quick-drying, pigmented latex paint based on either acrylic or a poly(vinylidene fluoride)/acrylic blend. The first layer is a titanium dioxide rutile white basecoat that increases the solar reflectance of a gray-cement concrete tile from 0.18 to 0.79, and that of a shingle surfaced with bare granules from 0.06 to 0.62. The second layer is a 'cool' color topcoat with weak near-infrared (NIR) absorption and/or strong NIR backscattering. Each layer dries within seconds, potentially allowing a factory line to pass first under the white spray, then under the color spray. We combined a white basecoat with monocolor topcoats in various shades of red, brown, green and blue to prepare 24 cool color prototype tiles and 24 cool color prototypes shingles. The solar reflectances of the tiles ranged from 0.26 (dark brown; CIELAB lightness value L* = 29) to 0.57 (light green; L* = 76); those of the shingles ranged from 0.18 (dark brown; L* = 26) to 0.34 (light green; L* = 68). Over half of the tiles had a solar reflectance of at least 0.40, and over half of the shingles had a solar reflectance of at least 0.25.},
doi = {},
journal = {Solar Energy Materials&Solar Cells},
issn = {0927-0248},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {11}
}