How To Install Valley Flashing To An Existing Roof

Before you apply the flashing you ll need to lay down a waterproof membrane.

How to install valley flashing to an existing roof.

Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses. Recommended procedures of basic valley flashing installation. 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. The top joinery of both valleys when they meet on the same plane of roof is shown here.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. In this video i show you how i do the valleys on a shingle roof. Flashing can be purchased in pre formed styles to help you install it more easily and these include. This recommendation includes iko s premium shingles.

When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof. For the valley areas of the roof you will be using valley flashing. Install an underlayment centered in the roof valley. Vent pipe flashing as the name implies this flashing is usually.

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

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.