The drip edge, also known as edge cap, is a strip of sheet metal that is L-shaped and is used to allow water to drip clear of the decking and siding of the house. It runs along the eaves of the entire roof where one side is secured to the decking before the first course of shingles is laid. The drip edge can be secured through nailing it or using roofing cement adhesive.
WHY DO YOU NEED A DRIP EDGE?
Without a drip edge a roof would fail to get water shedding into the gutters, with water instead dripping behind the gutters against the siding of the house. This could lead to rotting fascia, rotting sheathing, and discolored siding. A drip edge must be corrosion resistant, and should be at least .036 gauge or heavier for sustained durability.
(photo by Aubuchon Hardware)