How To Install Step Flashing On Existing Roof

Install the roofing screws vertically along each rib in the panel.

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. When retrofitting step flashing you will need to slide the step flashing up and under the existing shingles. The washer under the screw head should seal to the surface of the panel without bulging or shifting. Step flashing for chimneys.

Secure the screws but do not overtighten. This allows each step flashing piece to overlap the piece below. Once the shingles have been installed lay the base flashing around the base of the chimney approximately 4 past each end. Install a piece of step flashing over each shingle in a weave fashion.

Installing your roof flashing is going to be slightly different depending on the specific type that you re installing. Typically flashing is installed using roofing nails and roofing cement. The first piece of step flashing needs one bend so that it laps cleanly over the corner flashing installed in the previous step. 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. Step flashings are to be installed one per course. Bend the 10 in. Each piece of step flashing laps over the shingle below and under the shingle above.

It may seem as if a single piece of flashing would offer more protection than many pieces of step flashing. Cut step flashing pieces to be 10 in. Length to extend 5 in. Once even a small section of roofing cement fails you ll have a leak.

Then sink one nail into the sidewall to hold the step flashing in place. But it doesn t work that way. Wide and 2 in. Flashing is generally installed at any joints or edges in the roof where water could otherwise work its way in.

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. Continuous flashing against a sidewall is one way to install a roof but it s not the correct way. Proper installation of step flashing.