The film is about as thick as kitchen aluminum foil, slightly thicker, in fact. A layer of silver lies beneath it. That was all the researchers at the University of Colorado Boulder needed in 2017 to create a material that will cool any roof, or any surface covered by it, including when exposed to full sun rays, using no power or water. According to CU Boulder's announcement of the research, even 10 to 20 square meters of such film covering your roof can noticeably cool a whole family-size home in summertime.
The material is simpler than it may first appear
