Open Valley Roofing

That flashing is left exposed so the roof has visible lines of metal running down the valley.

Open valley roofing.

Open valley shingle installation an open valley relies on metal flashing for protection. After the underlayment is placed 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 acid rain and other contaminants. This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants.

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 is used. This leaves a metal strip or line on the surface of the roof that serves as the valley line. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. Once the shingles are installed they don t run through the valley area.

In comparison to a closed valley an open valley adds another layer of lining into the valley. The open woven and closed cut methods are demonstrated. Nrca lile recommends that roof valley flashing metal for open roof valleys should be 26 gauge 0 45mm galvanized steel or equivalent noncorrosive nonstaining metal. This video demonstrates the proper installation technique for installing roofing valleys.