The answer to 'how often to replace roof vent' is that roof vents typically need to be replaced every 15-20 years, or sooner if they become damaged or worn out. Roof vents play a critical role in maintaining proper airflow and ventilation in your attic, which helps prevent issues like excess moisture, mold, and premature roof deterioration. Over time, the materials in the vent can degrade due to exposure to the elements, so it's important to inspect your vents regularly and replace them when necessary.
If you notice any cracks, leaks, or other signs of damage around your roof vents, it's a good idea to have a professional roofing contractor take a look. They can assess the condition of your vents and let you know if replacement is needed. Proper roof ventilation is essential for the long-term health and performance of your roofing system.