How To Install Valley Flashing To An Existing Roof

In this video i show you how i do the valleys on a shingle roof.

How to install valley flashing to an existing roof.

Many roofers cut the shingles across because they say it s safer. 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.

Flashing can be purchased in pre formed styles to help you install it more easily and these include. The three methods to shingle a roof valley. Leave the old valley flashing in place and install new over it. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below.

For the valley areas of the roof you will be using valley flashing. Then install a non corrosive metal valley flashing of 24 minimum width. The top joinery of both valleys when they meet on the same plane of roof is shown here. No one of this affirmat.

Recommended procedures of basic valley flashing installation. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses. 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. Vent pipe flashing as the name implies this flashing is usually.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. 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. Before you apply the flashing you ll need to lay down a waterproof membrane. 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.

Install the underlayment as directed by the manufacturer then set the valley flashing on top of it. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.