Add Counter Flashing to Your Roof

What You'll Need
Metal cutters
Flat bar
Roofing caulk
Aluminum flashing
Roofing nails

Installing counter flashing to your roof is a weather protection necessity, that can easily be done by any homeowner. It only requires a few simple tools, and some basic roofing materials, in order to accomplish the task within a few hours. This process uses basic aluminum flashing, and attaches with nails and roofing caulk.

Step 1: Clean the Area

Scrape the area in which the counter flashing will be installed. Make sure to remove all old tar, caulking, staples, and nails. The area has to be completely free of solvents and debris, in order for the counter flashing to apply correctly.

Step 2: Prepare the Area

Run a large bead of silicone along the entire area where the counter flashing will be, and spread it evenly, to ensure that the flashing will adhere to the wall and roof. Cut a piece of flashing at the length that you need, with a minimum height of 4 inches, preferably around 6 inches, depending upon how much room you have in the area where it will be placed.

Step 3: Install the Counter Flashing

Using a straight edge, or piece of scrap lumber, bend the aluminum in half, making sure that the crease runs evenly down the entire length of it. Press it into place as carefully as you can, making sure that the outside edge of the crease goes solid against the inside corner of the roof. Press the surfaces of the flashing down, and secure into place with roofing nails. If the top portion is going into brick or concrete, be sure to use the appropriate nails for the specific application. Be sure that the flashing overhangs the outer edge by at least an inch, to allow for drainage of moisture and water.

Repeat this process as many times as needed. Remember that if you have to add more than one piece to a run, that the counter flashing should start from the bottom and overlap as it goes up.

Step 3: Seal

Run a bead of roofing caulk around all the outer edges, as well as any seams that were made. Flatten it down by running your finger along it, pressing down slightly, so that it presses into any areas in the flashing that may have moved away from the surface. This is one of the most important steps, because it ensures that the roofing materials will effectively weatherproof the building. Take your time, and make sure that all the edges and creases are completely covered, and that any imperfection between the flashing and the wall or roof is completely filled in before the final coating is applied.

Installing counter flashing is a very easy process that can be accomplished within an hour, depending upon the amount of it that needs to be installed. There is no point in hiring a roofing contractor to do this task, because it can save you time and money by completing the task yourself.