Open Valley Roofing

This is almost the same as the closed roof valley method except a pre bent metal valley lining is installed instead of a secondary roof underlayment.

Open valley roofing. Roofing shingles are installed then cut and sealed where they overlap the metal channel. Generally flashing is a metal. The open woven and closed cut methods are demonstrated. And either an organic or modified underlayment depending on whether tiles or shingles are being installed.

When it comes time to replace your roofing system you may be overwhelmed by the different details that make up a roof. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. The metal is usually pre painted to best complement the shingles color blend. If homeowners are looking to have their roof last for many years an open valley is iko s recommended choice and a good up sell opportunity for the roofing professional.

Shingle the other side of the valley the same way. This roof is on a small cabin in the back of beyond and the only valleys will be on 3 small dormers with about 6 feet of valley per side so i m not sure the water will wear out the valley shingles argument will work. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. In comparison to a closed valley an open valley adds another layer of lining into the valley.

This video demonstrates the proper installation technique for installing roofing valleys. Looking at your roof and the roofs of your neighbors small details can really make a difference in how your roof function. Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters. The open valley looks like each plane of the roof was cut in separate and the eye is drawn to the separation.

If you are installing an open valley you will need to select a flashing material. A roof using the open valley style involves placing a v or w shaped piece of metal usually galvanized or sometimes copper in the seam of the valley and then covered with a base sheet such as 30lb. In a previous video we covered how to flash roof edges before shingling. What is an open valley roof.

Roof one side of the valley running the shingles across it. First clean the debris out of the valley including sawdust nails and whatever else is in there. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Stop nailing 6 inches from the center.

In this video we ll flash the valley. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. This valley flashing material can be manufactured from any metal that will resist the effects of weather. Open valley vs closed valley.

Valley flashing options for an open valley installation.