This angled metal strip is nailed along the eaves and rakes of a roof deck before the roofing material is installed. Its outward-kicked lower lip breaks the surface tension of water, forcing runoff to drop clear of the fascia board rather than curling back under the shingles. It protects the roof sheathing and exterior trim from rot and water damage.
We need another bundle of drip edge for the garage eaves before we can lay the starter strip.
At the eaves, install the drip edge directly on the wood deck under the underlayment. At the rakes, install it over the underlayment.
Related terms
Starter strip
The foundational first layer of roofing material applied along the eave edge.
Apron flashing
A piece of sheet metal installed at the base of a wall or chimney to shed water onto the roof.
Step flashing
Overlapping L-shaped metal pieces used to seal the joint where a sloped roof meets a vertical wall.