How To Install Step Flashing On Existing Roof

Install a piece of step flashing over each shingle in a weave fashion.

How to install step flashing on existing roof.

Now notch the first step flashing so that it will bend to go around the chimney front and side as well as at the base. In order to properly install new flashing you ll have to remove the shingles surrounding your old flashing and then re lay them after installation. Step flashing for chimneys. Installing your roof flashing is going to be slightly different depending on the specific type that you re installing.

But it doesn t work that way. Install the roofing screws vertically along each rib in the panel. Once the shingles have been installed lay the base flashing around the base of the chimney approximately 4 past each end. It may seem as if a single piece of flashing would offer more protection than many pieces of step flashing.

Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run. Make sure the caulk joint between these two pieces is bedded evenly. The roof deck flange of step flashings are to be fastened to the surface of each shingle in a position whereby the next course of shingles will cover up hide the flashing from view. This allows each step flashing piece to overlap the piece below.

Wide and 2 in. Typically flashing is installed using roofing nails and roofing cement. Step flashings are to be installed one per course. Then sink one nail into the sidewall to hold the step flashing in place.

Once even a small section of roofing cement fails you ll have a leak. Secure the screws but do not overtighten. Longer than the shingle s exposure. With step flashing you do a little flashing then a lot of roofing then a little more flashing and so on.

Cut step flashing pieces to be 10 in. When retrofitting step flashing you will need to slide the step flashing up and under the existing shingles. The bottom edge of the flashing should extend just below the nail line. Proper installation of step flashing.

The washer under the screw head should seal to the surface of the panel without bulging or shifting. The first piece of step flashing needs one bend so that it laps cleanly over the corner flashing installed in the previous step. Length to extend 5 in. Each piece of step flashing laps over the shingle below and under the shingle above.