The answer to 'why is my ridge vent sagging' is that the ridge vent is likely not properly secured or supported. Ridge vents can sag over time due to a few common causes, including poor installation, weak or deteriorating roof framing, or excessive weight on the vent.
Some key symptoms of a sagging ridge vent include visible sagging or dips in the vent, gaps between the vent and the roof, and potential leaks or water damage. To fix a sagging ridge vent, you may need to reinforce the roof framing, properly secure the vent, or in some cases replace the entire ridge vent assembly.