|Researchers at the University of Technology Sydney have come up with a roof coating that not only absorbs less sunlight, but actually makes the roof colder than the surrounding air, even in intense summer heat. “This new surface, however, stayed 11 degrees or more
colder than an existing state-of-the-art white roof nearby because it absorbs only 3 per cent of incident sunlight while simultaneously strongly radiating heat at infrared wavelengths that are not absorbed by the atmosphere,” said Emeritus Professor Geoff Smith from the university. The researchers think this breakthrough is important not just for keeping energy use down in individual buildings, but because of the major impact super cool roofs could have on the urban heat island effect. If all buildings in a city had this new coating,
there would be a combined effect on the local temperature and energy use would drop city-wide.