Removing any moss is also very important. Moss has roots that can penetrate and destroy the shingles. roof more than likely does not need repaired, just cleaned. Ridding the roof of all the dirt and mold will erase the terrible black stains. The price about ten percent of the cost of a new roof. In addition the building stays cooler.cleaning black streaks off of asphalt roofs using only low pressure (actually no pressure) cleaning techniques. No harm to the shingles!

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