Drip edge is one of the most important parts of your roof system. It’s also one of the least understood.
What is it? Drip edge is roof-to-gutter flashing that allows your roof to shed water properly.
Why is drip edge needed for Denver area roofs? The four main reasons are:
1. Prevent fascia and soffit damage
2. Keep small pests out
3. Stabilize roof during windstorms
4. Protect your basement and foundation from water damage
https://solvistaroofing.com/blog/all-about-drip-edge/