How To Install Valley Flashing To An Existing Roof

To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below.

How to install valley flashing to an existing roof.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Install an underlayment centered in the roof valley. Leave the old valley flashing in place and install new over it.

In this video i show you how i do the valleys on a shingle roof. 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. This recommendation includes iko s premium shingles. Many roofers cut the shingles across because they say it s safer.

Iko recommends that you install architectural shingles with the open valley method for the best roof performance. Then install a non corrosive metal valley flashing of 24 minimum width. For the valley areas of the roof you will be using valley flashing. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses.

Vent pipe flashing as the name implies this flashing is usually. W type valley flashing is more rigid for handling so it stays straight and it stops waler rushing down one side of a roof from rushing back up the other side. Especially if you live in an area that gets a lot of snow and ice. Flashing can be purchased in pre formed styles to help you install it more easily and these include.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. The three methods to shingle a roof valley. Before you apply the flashing you ll need to lay down a waterproof membrane. The top joinery of both valleys when they meet on the same plane of roof is shown here.

Recommended procedures of basic valley flashing installation. Install the underlayment as directed by the manufacturer then set the valley flashing on top of it.