Also keeps your cooling bills from going through the roof
Source: Self-Chilling Roof Material Could Cool Your House For Free | Popular Science
SYDNEY—Researchers at Australia’s University of Technology have developed a new material they say can keep roofs cooler than the air above them, even in direct sunlight. The material is made from layers of specialized plastics stacked on top of a layer of silver. It is designed to only absorb 3% of the sunlight that hits it. Compared to currently available roofing materials that are designed to reduce temperature (usually white roofs that reflect sunlight), the test material stayed more than 50°F (27.7°C) cooler. A test roof was placed on an existing rooftop in downtown Sydney and monitored for several days. Even when the roof got dirty, the material still worked.
