re: Why aren't white shingle or light colored roofs more common in the South and hot climates?

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houses/buildings in Flarda use lightweight concrete tiles in lighter colors. They do well and look nice, but look like shite after 5 yrs of dust, smog, mildew build up.

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There’s nothing lightweight about them. They are denser than concrete block. The exposed tops of the tiles are painted in a variety of light and neutral colors. Tile roofs need to be pressure cleaned every few years but it leaves the roof looking brand new. Tile roofs reduce cooling costs.