The answer to 'why is my roof vent' is that there are several common causes for a roof vent not functioning properly. The most common issues are blockages, damage, or improper installation. Symptoms can include poor ventilation, moisture buildup, and even roof leaks.
If your roof vent is not working correctly, it's important to inspect it and address the underlying problem. For minor issues like a blocked vent, you may be able to clear the obstruction yourself. However, for more complex problems like structural damage or improper installation, it's best to call in a professional roofing contractor to diagnose and repair the issue.