Open Valley Roofing

This leaves a metal strip or line on the surface of the roof that serves as the valley line.

Open valley roofing.

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 video demonstrates the proper installation technique for installing roofing valleys. Once the shingles are installed they don t run through the valley area. That flashing is left exposed so the roof has visible lines of metal running down the valley.

After the underlayment is placed a pre bent metal valley lining is installed. Open roof valley 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. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. 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. This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants. 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. Lile points out that valleys lined with roll roofing are not as durable.