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Roof Moss Removal from Concrete Tiles

First off, it's important to know what type of roof that you have. I'm focusing here on concrete tile roofs.

About Concrete Tile

Sometimes called "slate", concrete tile is a light-weight, porous concrete that is shaped to fit over slats of wood nailed to your plywood roof. The concrete tiles interlock with each other. Most of them will probably not be nailed down, but are held in place by the interlocking parts and by the weight of the overlapping tile above and to the side of it. It's a pretty neat system.

That being said, I think it's obvious also that concrete tiles are not waterproof. They are not meant to hold water, they are meant to shed water. This is why it's important to keep concrete tile roofs clean of debris, especially in valleys where the water naturally collects as it flows downwards.

More to come later