What is the purpose of a drip edge on a roof?

The purpose of a drip edge on a roof is to direct water away from underlying materials. By extending slightly beyond the roof deck, the drip edge creates a channel that allows rainwater to flow off the roof and away from the fascia and soffit. This is crucial for preventing water from seeping under the roofing materials or into the building’s structure, which can lead to moisture problems, wood rot, and other issues over time.

Additionally, the drip edge helps to protect the underlying roofing layers and sheathing from potential water damage. By maintaining proper water drainage, it contributes to the longevity of the roof system and the overall integrity of the structure.