28 gauge. Measures 2 inches x 2 inches x 10 feet. Roofing Drip Edge Flashing is also known as roofing edge metal and gutter apron. Names vary in different parts of The United States. On the eave edges, drip edge is installed over the decking and underneath the underlayment. On the rake edges of the roof, drip edge is installed over the underlayment. Check your local building codes for preferred installation method in your roof project's jurisdiction.