What is the purpose of a drip edge in roofing?

The purpose of a drip edge in roofing is to prevent water from flowing back under the shingles. A drip edge is a metal flashing that is installed along the roof's eaves and rakes to ensure that water is directed away from the roof deck and into the gutters. This helps to protect the underlying roof structure from water damage, which can lead to issues such as rot, mold, and deterioration of roofing materials.

By creating a barrier that allows water to shed off the edges of the roof, the drip edge plays a crucial role in maintaining the integrity of the roofing system. It is particularly important in preventing water from seeping underneath the shingles, which could compromise the waterproofing capabilities of the roofing materials. Proper installation of a drip edge ensures that the roof performs effectively in redirecting water, thereby extending its lifespan and enhancing the overall function of the roofing system.

While aesthetic appeal, airflow direction, and insulation contribute to various aspects of roof performance, they do not directly address the primary function of a drip edge, which is focused on water management and prevention of potential damage.