Open Vs Closed Roof Valley

The closed variation is a flashing that has been completely covered with shingles while in the open variation will have the flashing completely exposed to the elements.

Open vs closed roof valley.

This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants. Repairs to closed valleys are a lot more involved than working on an open valley as is re roofing or making changes to a portion of your roof in the future. The only type of valley that is unacceptable is the woven valley. Although the open valley is recommended by the manufacturer closed valley is acceptable.

You are probably wondering what the heck that means. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. This leaves a metal strip or line on the surface of the roof that serves as the valley line. This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants.

On a closed valley roof the shingles extend to the valley area completely closing it off. With each new course roofing shingles continue up the valley. Closed roof valleys are very popular among homeowners for this reason. It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves.

In comparison to a closed valley an open valley adds another layer of lining into the valley. After the underlayment is placed a pre bent metal valley lining is installed. When installing a new roof one of the decisions you have to make as a home or building owner is whether or not you want to have open or closed valleys. When compared to a closed valley and open valley adds an additional layer of lining.

According to long time iko sales representative jeff tessaro closed valleys for residential construction have been popular since he was a roofing contractor in the late 90 s. For a closed valley shingles are installed across the joint where planes intersect. Closed valleys are very vulnerable to mechanical damage. We don t normally offer this line although it is available.

Open valleys can help your roof shed ice and water more efficiently but closed valleys are faster easier and generally cheaper to install. 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. Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed. It s all a matter of determining what you re looking for in a roof.