Moss and algae growth is common on shaded, north-facing roof planes in wet climates, and left untreated it lifts shingles and shortens roof life.
Moss treatment contractors combine safe removal (never pressure washing, which strips the protective granule coating) with zinc or copper strip installation to prevent regrowth. See our moss and algae guide for the recommended maintenance schedule.
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No — it strips the protective granule coating and can shorten shingle life by 5-8 years. See our moss and algae guide for the recommended approach.
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