The answer to 'why is my ridge vent algae growth' is that algae growth on a ridge vent is a common issue, often caused by moisture, shade, and organic debris buildup. Algae can thrive in the damp, dark environment of a ridge vent and can lead to premature deterioration of the vent material.
Some common symptoms of ridge vent algae growth include visible green or black discoloration on the vent, a slimy or mossy texture, and a foul odor. If left untreated, the algae can clog the vent, reducing airflow and causing other roofing problems.