Black streaking discolors a Clifton Park roof. Moss and lichen damage it. Moss builds a sponge that holds water against the shingle, works under the courses, and lifts edges — and in Capital Region freeze-thaw winters that trapped water expands and pries the shingle apart, over and over, from November through April.
Those patios are now 15–25 years old: the original joint sand is gone, moss has moved into the shaded backyards near Vischer Ferry, and pavers rock underfoot at the edges.
Lichen is worse still, because it roots into the shingle mat itself and can't be brushed off at all. Both have to be killed chemically and allowed to release on their own with weather — never scraped, and never blasted with a pressure washer.