A drip edge is a metal flashing installed along the edges of a roof to control the flow of water away from the fascia and underlying roof components. It is typically installed under the roofing material and over the roof decking at the perimeter.
The primary function of a drip edge is to prevent water from seeping back under the roof edge due to surface tension. It directs water into the gutters and away from the building structure.
Drip edges also protect the roof decking and fascia board from moisture damage, reducing the risk of rot and extending the lifespan of these components. They also help prevent wind-driven rain from infiltrating beneath shingles.
In many building codes, drip edges are a required component of roofing systems due to their importance in water management.
Proper installation ensures that water flows efficiently off the roof without damaging structural elements or exterior finishes.
