The self-cleaning system consisting of waterborne two-component acrylic silicon polymers and alkyl silicate is used as a highly effective self-cleaning coating. This system is useful in the formation of a self-cleaning topcoat that effectively maintains the high solar reflectance of a cool roof after coating. This capability was confirmed by an outdoor exposure test that compared self-cleaning and non-self-cleaning coatings. The energy savings of the self-cleaning coating for cooling were estimated via a cooling load calculation. (C) 2017 Elsevier B.V. All rights reserved.