The answer to 'why is my roof vent algae growth' is that algae growth on roof vents is a common issue caused by moisture, lack of airflow, and organic debris buildup. Algae thrive in damp, shaded environments and can discolor the vent and surrounding roof. This can lead to premature wear and even leaks if left untreated.
To address algae growth on roof vents, you'll need to clean the vent thoroughly and improve airflow and drainage. This may involve removing debris, trimming nearby vegetation, and ensuring the vent is properly sealed. In some cases, replacing the vent or upgrading the roofing system may be necessary. While basic cleaning can often be done as a DIY project, more extensive repairs or replacements should be handled by a professional roofing contractor to ensure the integrity of your roof.