White Flat Tile
Another roofing material well-suited to warm climates is flat concrete tiling, and as mentioned earlier, it's available in cool colors. A close, but lighter-weight version is the bright white flat tile made of ceramic, elastomeric material or combinations of fibers and cement. These white flat tiles rank high in testing as both very heat-reflective and long lasting. Flat white cement tiles reflect as much as 77 percent of the sun's rays [source: Better Homes and Gardens]. As with the white barrel type, white flat tiles keep heat from filtering down into buildings.
Some upkeep comes with white roofing, as with most roof types, and power-washing helps to keep the surface from becoming dingy and losing its reflective edge over more traditional shingles.