The answer to 'why is my drip edge algae growth' is that algae growth on the drip edge of your roof is a common issue caused by moisture, shade, and environmental conditions. Drip edges are prone to algae buildup because they are often in damp, shaded areas where algae can thrive.
The main symptoms of algae growth on the drip edge include a green, slimy buildup that can spread across the metal edge. This can be an aesthetic issue, but it can also lead to premature deterioration of the drip edge over time. Fortunately, there are some steps you can take to prevent and remove algae growth on your drip edge.