How to Install Drip Edge Flashing

What You'll Need
Metal drip edge
Tape measure
Galvanized roofing nails

Situated along the edge of the roof, drip edge flashing stops water from being blown or seeping under the roof tiles, preventing leaks. This type of flashing is available in 10-foot sections and can be purchased in several different profiles. Not only does the edging prevent water from blowing under your shingles, but a lip along the edge makes water drip down out and away from your house, instead of directly down the side of the wall or fascia. This helps prevent water damage all the way from the roof to the foundation.

Step 1 - Prep and Measure

Before you being, prepare your roof by removing all the dirt and debris. Next, take measurements of all the outer edges of your roof to determine how much drip edge you need.

Step 2 - Cut the Lengths of Drip Edge

Use a metal snip to cut the lengths of the drip edge according to your measurements. For the first piece, set the strip against the corner of the fascia where the slopped edge meets the horizontal edge. Mark the angle of the slope on the strip and cut it to match so that it will be flush with the edge when installed.

Step 3 - Start the Drip Edge

Do this on a warm day so the shingles can be easily peeled back. Start the installation at the lower edge of the roof and work your way up toward the peak. Lift the shingles and slide the top flange of the drip edge underneath. Tack the edge in place with a roofing nail every foot or so. Drive the nail through the drip edge into the roof surface, not through the fascia. Set the shingles back in place as you go.

Step 4 - Overlap Joints

When you reach the end of a strip, start the next length with a lap joint. To create lap joint, you overlap the drip edge ends with the upper edge over the lower edge, so water flowing down hill will pass over the joint, not divert under it. Continue the process until you have laid drip edge metal strip on all the edges of the roof, front and back and sides.