Open Valley Roof Installation

Closed valleys or open valleys.

Open valley roof installation.

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

Open valley shingle installation. In this video i show you how i do the valleys on a shingle roof. Roofing shingles are installed then cut and sealed where they overlap the metal channel. 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. That flashing is left exposed so the roof has visible lines of metal running down the valley. Then install a non corrosive metal valley flashing of 24 minimum width. Before you install a shingle roof the contractor will install an underlayment over the entire roof deck.

Install an underlayment centered in the roof valley. The metal is usually pre painted to best complement the shingles color blend. Roof one side of the valley running the shingles across it. The open woven and closed cut methods are demonstrated.

For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. Open valleys and closed valleys. No one of this affirmat. Many roofers cut the shingles across because they say it s safer.

Stop nailing 6 inches from the center. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. In our opinion df while roll roofing or peel and stick ice and water shield membrane work well as roof valley underlayment using roll roofing as the final surface in an open roof valley is not as durable as the metal lined valley options or closed cut or woven valleys discussed below. Shingle the other side of the valley the same way.

An open valley relies on metal flashing for protection. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. 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. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.