The answer to 'drip edge sagging' is that a sagging drip edge is typically caused by improper installation, age, or damage. Symptoms include water leaking behind the drip edge, gutters pulling away from the roof, and visible sagging or separation from the roof edge. Solutions can include re-securing the drip edge, replacing damaged sections, or completely reinstalling the drip edge if it has pulled away significantly.
For minor sagging, a DIY fix may be possible by re-securing the drip edge with roofing nails or screws. However, for more extensive damage or if the drip edge is pulling away from the roof, it's best to call a professional roofer to properly assess and repair the issue. Attempting a complex roof repair without experience can lead to further damage and leaks.