GCCA Board Member Ronnen Levinson just announced the publication of ASTM D7897-15, ‘Standard Practice for Laboratory Soiling and Weathering of Roofing Materials to Simulate Effects of Natural Exposure on Solar Reflectance and Thermal Emittance’.
This practice was developed and shepherded through ASTM by the LBNL Heat Island Group and by Concordia University, with support from DOE’s Building Technologies Office, and from many industrial and academic partners. It will be used to accelerate the development and deployment of cool roofing materials, and has already been accepted for interim rating of roofing products by the Cool Roof Rating Council (CRRC) and by California’s Title 24 Building Energy Efficiency Standards. The CRRC and LBNL will offer courses at LBNL next month to train and certify test laboratories. Research is underway to adapt the method for use in China, India, and Europe.
While they work with the Berkeley Lab News Center to prepare a release, you can read this earlier write-up describing the acceptance of the practice by CRRC and CA Title 24. You can also learn more about the method itself in the first half of this eight-minute Science at the Theater talk, Cool Roofs Though Time and Space, and in their 2014 SOLMAT article.