Open Valley Roof Addition

The gable roof on the porch addition was framed with a dropped structural ridge supporting the common rafters above.

Open valley roof addition.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Roof one side of the valley running the shingles across it. The metal is usually pre painted to best complement the shingles color blend. Roof valleys are like gutters with a steep pitch.

There are two common methods for completing the flashing of a valley in a shingle roof system. That flashing is left exposed so the roof has visible lines of metal running down the valley. Open valley shingle installation. Shingle the other side of the valley the same way.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. 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. After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side. In this video we ll flash the valley.

After the underlayment is placed a pre bent metal valley lining is installed. Stop nailing 6 inches from the center. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. First clean the debris out of the valley including sawdust nails and whatever else is in there.

Again choosing the easy way out we opted to build blind valleys aka california valleys where one. 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. But the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash. In a previous video we covered how to flash roof edges before shingling.

This metal lining can be made of any. An open valley relies on metal flashing for protection. Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters. Roofing shingles are installed then cut and sealed where they overlap the metal channel.

One of the details that varies between homes is the method of flashing the valley areas of the roof. When compared to a closed valley and open valley adds an additional layer of lining. Also different architectural styles will use the same type of roof.