The answer to 'roof vent algae growth' is that algae growth on roof vents is a common problem caused by moisture, lack of air circulation, and exposure to the elements. Symptoms include a green or black discoloration on the vent, which can lead to deterioration and reduced efficiency.
In many cases, homeowners can address minor algae growth on roof vents through DIY cleaning and maintenance. However, for more severe cases or if the vent is damaged, it's best to call a professional roofing technician to inspect and repair the issue properly.