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.

How to install valley flashing to an existing roof.

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. This recommendation includes iko s premium shingles. Vent pipe flashing as the name implies this flashing is usually.

Iko recommends that you install architectural shingles with the open valley method for the best roof performance. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. I have my valley custom made with water trough to help with leaking b. 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. Recommended procedures of basic valley flashing installation. Flashing can be purchased in pre formed styles to help you install it more easily and these include. Leave the old valley flashing in place and install new over it.

Install the underlayment as directed by the manufacturer then set the valley flashing on top of it. Install an underlayment centered in the roof valley. Then install a non corrosive metal valley flashing of 24 minimum width. 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. No one of this affirmat. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Especially if you live in an area that gets a lot of snow and ice.

The three methods to shingle a roof valley. Many roofers cut the shingles across because they say it s safer.