Open Valley Roofing

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

Open valley roofing.

The open woven and closed cut methods are demonstrated. This video demonstrates the proper installation technique for installing roofing valleys. Lile points out that valleys lined with roll roofing are not as durable. This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants.

After the underlayment is placed 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. This leaves a metal strip or line on the surface of the roof that serves as the valley line. Open valley when compared to a closed valley and open valley adds an additional layer of lining.

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. After the self adhering underlayment is installed across the valley 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. Once the shingles are installed they don t run through the valley area.