How To Install Valley Flashing To An Existing Roof

Then install a non corrosive metal valley flashing of 24 minimum width.

How to install valley flashing to an existing roof.

Many roofers cut the shingles across because they say it s safer. 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. The top joinery of both valleys when they meet on the same plane of roof is shown here. The three methods to shingle a roof valley.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. Iko recommends that you install architectural shingles with the open valley method for the best roof performance. For the valley areas of the roof you will be using valley flashing. Install an underlayment centered in the roof valley.

This recommendation includes iko s premium shingles. 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. Before you apply the flashing you ll need to lay down a waterproof membrane. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses.

Especially if you live in an area that gets a lot of snow and ice. 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. I have my valley custom made with water trough to help with leaking b.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. 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. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below.

No one of this affirmat. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.