To prevent moss and algae growth on your roof, keep trees trimmed to reduce shade and debris accumulation. Ensure proper roof ventilation to maintain dry conditions that discourage growth. Install zinc or copper strips along the ridge of your roof; when it rains, these metals release ions that inhibit moss and algae growth. Periodically clean your roof with a gentle bleach solution to remove existing growth and prevent future infestations. For more information, visit Ultra Dry Roofing.