Were you looking at a flat Tile Roof or possibly a Slate Roof? I agree, a picture or 2 may help us determine what you were looking at. Did they look like this?
this is an old expensive house and from what i understand cement shingles are kind of a specialty as far as not many people do them. they are thick cement shingles attached and laid out just like asphalt shingles. supposedly they are very expensive. they're nice looking but seem like a pain. all i know is what the owner told me. i told them i'd do some research. i'll try to get a pic on monday.
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i'm not even sure if there's algae there. they're just old and really dirty with multiple different colored stains. like i said i only know what the owner told me. copper gutters too, nice and green.
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Northern Neck Property Services
Proudly serving the Northern Neck, Middle Peninsula & Surrounding Areas
804.450.3341
Safe Roof & Exterior Cleaning Serving the NNK of VA
Those thick concrete shingles cleas up like tile IMHO, but there is a special way to learn to walk on them Some of the south/central florida boys would be a big help with these types of tiles, as they are a rarity in my neck of the woods.
Search the "tile shingle " forum for more inof. you should find a lots of news/tips/techniques there.
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