How To Install Valley Flashing To An Existing Roof

The three methods to shingle a roof valley.

How to install valley flashing to an existing roof.

For the valley areas of the roof you will be using valley flashing. Step flashing built to protect joints between roofs chimneys and other objects like skylights this flashing steps up above the shingles and attaches to the object providing comprehensive water protection. Flashing can be purchased in pre formed styles to help you install it more easily and these include. Recommended procedures of basic valley flashing installation.

Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. Leave the old valley flashing in place and install new over it. Vent pipe flashing as the name implies this flashing is usually. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Many roofers cut the shingles across because they say it s safer. Especially if you live in an area that gets a lot of snow and ice. I have my valley custom made with water trough to help with leaking b.

No one of this affirmat. Install the underlayment as directed by the manufacturer then set the valley flashing on top of it. Then install a non corrosive metal valley flashing of 24 minimum width. Install an underlayment centered in the roof valley.

Iko recommends that you install architectural shingles with the open valley method for the best roof performance. This recommendation includes iko s premium shingles. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses.

In this video i show you how i do the valleys on a shingle roof. The top joinery of both valleys when they meet on the same plane of roof is shown here.