The answer to 'how often to replace roof vent' is that most roof vents should be replaced every 10-15 years, or sooner if they become damaged or stop functioning properly. Roof vents play a critical role in maintaining proper airflow and ventilation in your attic, which helps prevent moisture buildup, mold, and other issues.
Over time, roof vents can become worn down by exposure to the elements, such as wind, rain, and UV rays. The materials used to construct the vent, such as plastic or metal, can also deteriorate and lose their effectiveness. Replacing the roof vent before it fails completely is important to ensure your attic remains well-ventilated and protected.