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. Vent pipe flashing as the name implies this flashing is usually. The top joinery of both valleys when they meet on the same plane of roof is shown here. 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.

Install an underlayment centered in the roof valley. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses. The three methods to shingle a roof valley. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below.

Many roofers cut the shingles across because they say it s safer. Leave the old valley flashing in place and install new over it. Recommended procedures of basic valley flashing installation. I have my valley custom made with water trough to help with leaking b.

Flashing can be purchased in pre formed styles to help you install it more easily and these include. Iko recommends that you install architectural shingles with the open valley method for the best roof performance. 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. Especially if you live in an area that gets a lot of snow and ice.

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. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. 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.

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.