As you get quotes for your new roof, you will need to determine what materials you want to use on it. One of those materials is the roof drip edge, which is not required for your roof but does provide many benefits. 1. Stop Water Damage One of the most significant benefits of installing a roof drip edge is that it can help stop water damage. The edge of your roof, where the decking meets with the fascia, is a vulnerable spot where water can work its way under your roof, destroying the underlayment and the decking.