Installation Open Valley Roof

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

Installation open valley roof.

One of the details that varies between homes is the method of flashing the valley areas of the roof. The open woven and closed cut methods are demonstrated. There are two methods for sealing valleys. The metal is usually pre painted to best complement the shingles color blend.

Open valley shingle installation makes use of the metal flashing sheets that need to be installed so that they overlap each other by few inches with the upper piece of sheet is resting over the bottom piece. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. But the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash. Roofing shingles are installed then cut and sealed where they overlap the metal channel.

Open valley shingle installation. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. That flashing is left exposed so the roof has visible lines of metal running down the valley. The three basic valley types for asphalt shingle roof systems are woven open and closed cut.

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. Roof valleys are like gutters with a steep pitch. Closed valleys or open valleys. An open valley relies on metal flashing for protection.

Find out the differences before you talk to a roofing expert. Some homeowners do not like the look of open valleys while others feel the metal accentuates the roof s shape particularly if copper or painted flashing. Before you install a shingle roof the contractor will install an underlayment over the entire roof deck. Roof one side of the valley running the shingles across it.

Pros of open valley shingle installation. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. In addition there are recognized options for open and closed cut valleys commonly referred to as california open valleys and california closed cut valleys open valley. Stop nailing 6 inches from the center.

During its installation process the open valley shingle utilizes the w metal flashing which helps in preventing the water from rushing down. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. This video demonstrates the proper installation technique for installing roofing valleys.