Open Valley Roof Addition

Roof one side of the valley running the shingles across it.

Open valley roof addition.

In this video we ll flash the valley. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Roofing shingles are installed then cut and sealed where they overlap the metal channel. When compared to a closed valley and open valley adds an additional layer of lining.

For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Shingle the other side of the valley the same way. Stop nailing 6 inches from the center.

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 metal is usually pre painted to best complement the shingles color blend. Roof valleys are like gutters with a steep pitch.

Again choosing the easy way out we opted to build blind valleys aka california valleys where one. The gable roof on the porch addition was framed with a dropped structural ridge supporting the common rafters above. Open valley shingle installation. Intricate roofs have many parts that incorporate several of the basic roof designs such as a gable roof sitting atop a gambrel or variations of the gable valley roof design using one or a variety of different types of roof trusses also see our very detailed diagrams showing the different parts of a roof truss.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. After the underlayment is placed a pre bent metal valley lining is installed. Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters. There are two common methods for completing the flashing of a valley in a shingle roof system.

This allows water to fall from the higher slope to the lower slope and prevents it from going under the shingles to the roof deck. This metal lining can be made of any. That flashing is left exposed so the roof has visible lines of metal running down the valley. In a previous video we covered how to flash roof edges before shingling.

Also different architectural styles will use the same type of roof. An open valley relies on metal flashing for protection. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side.