Abstract
The authors are researching on the application to the cool roof paint of self-cleaning technology. This paper describes the results of a comparison between the developed paint and commercial paint. In addition to it, also describes the results of verification of the accelerated soiling test method advocated in the United States. This study clarified the following results. (1)The development paint is good in solar reflectance retention as compared to the commercial paint. (2)The test method advocated in the United States is difficult to apply to the cool roof paint made in Japan without improvement.