Unfortunately that growth is alive, and it is eating your shingles! Mold, moss, mildew, algae, and lichen are extremely damaging to your roof. Root structures burrow in between the shingles and sometimes through them, depending on how bad the organic growth has become. They eat the lime from in the shingles and then to top it off, the byproduct from the lime consumption is an acid further deteriorating the shingle. Don't ignore the problem. Just like a car in Connecticut that doesn't get washed in the winter will rust from the salt, your roof needs to be washed too.
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