The answer to 'ridge vent sagging' is that a sagging ridge vent is often caused by improper installation, poor ventilation design, or damage from weather and age. Symptoms include a visible dip or sag in the ridge vent, which can lead to leaks, poor airflow, and even structural issues. To fix a sagging ridge vent, you may need to reinforce the vent, replace damaged components, or in some cases, completely reinstall the vent.
In many cases, a sagging ridge vent is best addressed by a professional roofing contractor. They can properly diagnose the root cause and make the necessary repairs to restore the vent's function and appearance. Attempting DIY repairs without the proper knowledge and tools can lead to further damage or safety issues.