As the weather warms up and we all start getting outside a little more often, you may have noticed that the ugly stains on your roof that bugged you last year are still there. Lichen, green or black algae, moss, or mold and mildew on the roof can mar your home’s appearance and make you want to avoid gazing skyward this summer. Some stains won’t just bug you, though–moss can grow underneath of shingles and cause […]