Cool Roofs are roofs consisting of materials that effectively reflect the sun's energy from the roof surface. Cool materials for low-slope roofs are mainly bright white in color, although non-white colors are available for sloped roof applications. Cool roofs must also have high emissivity, allowing them to emit infrared energy. Bare metals and metallic coatings tend to have low emissivity and are not considered cool materials.
Cool roofs reduce the roof surface temperature by 50 to 60 degrees F, thereby reducing the heat transferred to the building below. This helps reduce energy costs by keeping attics and ducts cooler, improve occupant comfort, cut maintenance costs, increase the life span of the roof, and reduce urban heat islands and their associated smog. All cool roofs for which compliance credit is taken, regardless of compliance approach, must meet the Title 24 requirements.