The smooth surfaces of clay tiles, natural colored, engobed or glazed, do not allow airborne materials to accumulate. This helps to prevent the build-up of moss and other vegetation growth on the roof's surface.
And just to add some weekend humour if one may?
Smooth surface = no one can nick your ariel, if they slip off while trying? Right?
Pigeons will feel like they're standing on a slanted ice floor? No more p*o droppings? Right? Right?
Shiney like a tiled floor just after it's been moped kinda shiney? Hummm, it does have it's ascetic appeal if that is your preference? Not significantly more than a rough clay tile, I wouldn't think so.
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