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Short answer: yes, in most cases. Pressure washing roof warranty exclusions are written into GAF, Owens Corning and CertainTeed coverage. Here’s what high pressure actually does to a roof, and what to use instead. In This Article Asphalt ShinglesTile RoofsManufacturer RulesSoft WashingBlack StreaksPalm Beach CountyComparison TableFAQ If you’ve searched this question, you’ve probably already seen…