What does a drip edge do?

A drip edge plays a crucial role in managing water flow on a roof. It is specifically designed to direct water away from the edges of the roof and into the gutters. By controlling the direction of dripping water, the drip edge prevents water from running down the fascia and potentially causing damage to the underlying structures, such as the decking or framing. This not only helps in diverting water to prevent leaks and water damage but also minimizes the risk of erosion and deterioration of the roofing materials at the edges over time.

While other functions may seem relevant, they do not align with the primary purpose of the drip edge. For instance, supporting the roof assembly is more typically the role of rafters and trusses, not a drip edge. Enhancing the aesthetic design may be a secondary benefit of the drip edge in some cases, but it is not its fundamental function. Lastly, moisture absorption is not applicable here, as a drip edge is designed to redirect water rather than absorb it.