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High-pressure water can do serious damage in seconds. Pressure washing damages shingles, shortens roof lifespan, and may void warranties. Water forced under shingles can cause mold, leaks, and rot.

QDEAR TIM: My roof needs cleaning. It's a newer asphalt shingle roof, but parts of it are covered with moss, lichens and algae. Is a pressure washer a good tool for cleaning roof shingles? Will it ...