Concrete slate tiles have to be the most difficult type of roof cover to inspect. They are hard to walk on because of the flat surface. If one misses a step incorrectly the tile will crack. Many inspectors will not attempt to walk on this type of roof cover for that reason. If one doesn't have the experience on walking this type of roof cover, do not do it.
On the bottom left corner of the picture there is a cracked tile. Couple more tiles were found cracked not shown here on the pictures. Over all the roof was fine with the expection that the wrong type of nails were used to anchor the tiles. They were non-galvanized type, so the nails were rusted, which need to be replaced. With time the tiles will start to dislodge themselves.
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