Roof Valley Flashing Installation

Closed valleys or open valleys.

Roof valley flashing installation.

Flashing should be installed in all of the valleys. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present.

Stop nailing 6 inches from the center. Open valleys have metal flashing to protect this critical area of the roof. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Remember to caulk the underside of the flashing with a sealant.

In this video i show you how i do the valleys on a shingle roof. Roof one side of the valley running the shingles across it. Install an underlayment centered in the roof valley. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Architectural shingle installation is especially critical in roof valleys where iko recommends an open valley installation. One of the details that varies between homes is the method of flashing the valley areas of the roof. There are two common methods for completing the flashing of a valley in a shingle roof system. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

Now nail this first flashing at both its far ends. No one of this affirmat. Installing metal flashing for your roof project is a challenging but essential step to take to ensure that the new roof remains as weatherproof and as strong as possible the following steps will explain how to install metal flashing in roof valleys. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

Many roofers cut the shingles across because they say it s safer. Shingle the other side of the valley the same way. Then install a non corrosive metal valley flashing of 24 minimum width. 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.

Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Step 6 install the. 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.