Open Valley Roofing

Open valley when compared to a closed valley and open valley adds an additional layer of lining.

Open valley roofing.

That flashing is left exposed so the roof has visible lines of metal running down the valley. 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. 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. This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants.

This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants. Once the shingles are installed they don t run through the valley area. 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. 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. Lile points out that valleys lined with roll roofing are not as durable. This video demonstrates the proper installation technique for installing roofing valleys. This leaves a metal strip or line on the surface of the roof that serves as the valley line.