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Abstract
The results of an ongoing exposure test of ten highly- solar reflective roofing sheets, polyvinyl chloride (PVC) and ethylene propylene diene monomer (EPDM), are reported. Some of them are pigment-mixed type and the others are paint-coated-type. These roofing sheets were mounted on substrate boards and installed on flat roofs located in six districts with different environmental conditions in Japan. The specimens were inclined at an angle of 1/50 and oriented due south. Rectangular small samples were removed from each of the sheets at three-month intervals for two years to measure the solar reflectance, color indices and water contact angle. Following these measurements right after sampling, namely untreated, each sheet was scrubbed and rinsed with water and the same characteristics were re-evaluted to determine the effect of cleaning on solar reflectance. Additionally, in order to investigate the influence of pollutants on the surface characteristics of the roofing sheets, rainwater was collected from each roof and analyzed for pollutants.
The results of an ongoing exposure test of ten highly- solar reflective roofing sheets, polyvinyl chloride (PVC) and ethylene propylene diene monomer (EPDM), are reported. Some of them are pigment-mixed type and the others are paint-coated-type. These roofing sheets were mounted on substrate boards and installed on flat roofs located in six districts with different environmental conditions in Japan. The specimens were inclined at an angle of 1/50 and oriented due south. Rectangular small samples were removed from each of the sheets at three-month intervals for two years to measure the solar reflectance, color indices and water contact angle. Following these measurements right after sampling, namely untreated, each sheet was scrubbed and rinsed with water and the same characteristics were re-evaluted to determine the effect of cleaning on solar reflectance. Additionally, in order to investigate the influence of pollutants on the surface characteristics of the roofing sheets, rainwater was collected from each roof and analyzed for pollutants.
Date
6/2010
6/2010
Author(s)
N Koshiishi; K Tanaka; R Sawanishi; I Shimizu
N Koshiishi; K Tanaka; R Sawanishi; I Shimizu
Page(s)
361-368
361-368
Keyword(s)
solar reflectance; cool roofing; ICBEST; aging; PVC roofing; EPDM roofing
solar reflectance; cool roofing; ICBEST; aging; PVC roofing; EPDM roofing