Installation Open Valley Roof

The open woven and closed cut methods are demonstrated.

Installation open valley roof.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. There are two common methods for completing the flashing of a valley in a shingle roof system. This video demonstrates the proper installation technique for installing roofing valleys. Open valley shingle installation.

Closed valleys or open valleys. 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. The three basic valley types for asphalt shingle roof systems are woven open and closed cut. But the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash.

There are two methods for sealing valleys. Shingle the other side of the valley the same way. An open valley relies on metal flashing for protection. The metal is usually pre painted to best complement the shingles color blend.

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. Stop nailing 6 inches from the center. That flashing is left exposed so the roof has visible lines of metal running down the valley. Open valleys and closed valleys.

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. Pros of open valley shingle installation. Roof one side of the valley running the shingles across it. 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.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. One of the details that varies between homes is the method of flashing the valley areas of the roof. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Roof valleys are like gutters with a steep pitch. During its installation process the open valley shingle utilizes the w metal flashing which helps in preventing the water from rushing down. Before you install a shingle roof the contractor will install an underlayment over the entire roof deck.