Open Valley Roof Addition

In a previous video we covered how to flash roof edges before shingling.

Open valley roof addition.

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. Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters. But the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash.

Roof one side of the valley running the shingles across it. Again choosing the easy way out we opted to build blind valleys aka california valleys where one. First clean the debris out of the valley including sawdust nails and whatever else is in there. Closed valleys or open valleys.

When compared to a closed valley and open valley adds an additional layer of lining. Open valley shingle installation. 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. After the underlayment is placed a pre bent metal valley lining is installed. Also different architectural styles will use the same type of roof. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.

Stop nailing 6 inches from the center. 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. Roofing shingles are installed then cut and sealed where they overlap the metal channel. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. 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. In this video we ll flash the valley.

After installing the rafters we still had to extend the porch roof back over the shed roof creating a valley on either side. An open valley relies on metal flashing for protection. 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.