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Title: Aging and weathering of cool roofing membranes

Abstract

Aging and weathering can reduce the solar reflectance of cool roofing materials. This paper summarizes laboratory measurements of the solar spectral reflectance of unweathered, weathered, and cleaned samples collected from single-ply roofing membranes at various sites across the United States. Fifteen samples were examined in each of the following six conditions: unweathered; weathered; weathered and brushed; weathered, brushed and then rinsed with water; weathered, brushed, rinsed with water, and then washed with soap and water; and weathered, brushed, rinsed with water, washed with soap and water, and then washed with an algaecide. Another 25 samples from 25 roofs across the United States and Canada were measured in their unweathered state, weathered, and weathered and wiped. We document reduction in reflectivity resulted from various soiling mechanisms and provide data on the effectiveness of various cleaning approaches. Results indicate that although the majority of samples after being washed with detergent could be brought to within 90% of their unweathered reflectivity, in some instances an algaecide was required to restore this level of reflectivity.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE. Assistant Secretary for Energy Efficiency andRenewable Energy.Office of the Deputy Assistant Secretary for TechnologyDevelopment. Office of the Building Technologies Division
OSTI Identifier:
860745
Report Number(s):
LBNL-58055
R&D Project: EK241L; BnR: 600303000; TRN: US200524%%307
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: First International Conference on Passive and LowEnergy Cooling for the Built Environment, Athens, Greece, May 17,2005
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; AGING; CLEANING; DETERGENTS; MEMBRANES; REFLECTIVITY; ROOFS; SOAPS; SPECTRAL REFLECTANCE; WATER; WEATHERING

Citation Formats

Akbari, Hashem, Berhe, Asmeret A, Levinson, Ronnen, Graveline, Stanley, Foley, Kevin, Delgado, Ana H, and Paroli, Ralph M. Aging and weathering of cool roofing membranes. United States: N. p., 2005. Web.
Akbari, Hashem, Berhe, Asmeret A, Levinson, Ronnen, Graveline, Stanley, Foley, Kevin, Delgado, Ana H, & Paroli, Ralph M. Aging and weathering of cool roofing membranes. United States.
Akbari, Hashem, Berhe, Asmeret A, Levinson, Ronnen, Graveline, Stanley, Foley, Kevin, Delgado, Ana H, and Paroli, Ralph M. Tue . "Aging and weathering of cool roofing membranes". United States. https://www.osti.gov/servlets/purl/860745.
@article{osti_860745,
title = {Aging and weathering of cool roofing membranes},
author = {Akbari, Hashem and Berhe, Asmeret A and Levinson, Ronnen and Graveline, Stanley and Foley, Kevin and Delgado, Ana H and Paroli, Ralph M},
abstractNote = {Aging and weathering can reduce the solar reflectance of cool roofing materials. This paper summarizes laboratory measurements of the solar spectral reflectance of unweathered, weathered, and cleaned samples collected from single-ply roofing membranes at various sites across the United States. Fifteen samples were examined in each of the following six conditions: unweathered; weathered; weathered and brushed; weathered, brushed and then rinsed with water; weathered, brushed, rinsed with water, and then washed with soap and water; and weathered, brushed, rinsed with water, washed with soap and water, and then washed with an algaecide. Another 25 samples from 25 roofs across the United States and Canada were measured in their unweathered state, weathered, and weathered and wiped. We document reduction in reflectivity resulted from various soiling mechanisms and provide data on the effectiveness of various cleaning approaches. Results indicate that although the majority of samples after being washed with detergent could be brought to within 90% of their unweathered reflectivity, in some instances an algaecide was required to restore this level of reflectivity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {8}
}

Conference:
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