The answer to 'roof vent sagging' is that a sagging roof vent is typically caused by a structural issue or deterioration of the vent itself. Symptoms include the vent not sitting flush with the roof, gaps around the vent, and potential leaks. Solutions may involve repairing or replacing the vent, reinforcing the roof structure, or properly securing the vent.
In many cases, a sagging roof vent is a sign of a larger problem that requires professional inspection and repair. While simple fixes like reattaching the vent may be possible for a handy homeowner, significant structural issues or vent replacement should be handled by an experienced roofing contractor.