A method of roof construction at the internal intersection of two sloping planes where the shingles or tiles are held back from the centerline. This leaves a wide strip of metal flashing exposed to catch and channel water. It sheds water and debris much faster than a closed valley, making it less prone to clogging from leaves or ice buildup.
There are too many trees around this property, so we're going to run an open valley in copper so the pine needles wash right off.
Do not mix it up with
- Closed-cut valley: An open valley leaves the metal flashing visible, while a closed-cut valley runs the shingles from one side across the joint.
Related terms
Closed-cut valley
A roof valley installation where shingles from one plane cross the center and the other side is trimmed.
Valley piece
A specialized roofing tile or shingle shaped to fit the internal intersection of two roof slopes.
Valley board
A flat timber installed in the internal angle of a roof to support metal flashing.