What is the definition of closed or cut valleys in roofing terminology?

The definition of closed or cut valleys in roofing terminology refers to shingles that are trimmed back from the valley centerline. This method is commonly used to create a clean and defined angle where two roof surfaces meet. In this technique, shingles are cut to allow water to flow into the valley instead of pooling, which helps prevent leaks and improve drainage. By having the shingles run up to the valley's sides without overlapping each other in the center, it maintains a tidy appearance and reduces the chances of water seeping under the shingles.

In this context, the other options do not accurately describe closed or cut valleys. Shingles laid flat without overlap could create issues with water drainage and is usually not a preferred method in valley construction. Shingles arranged in a diamond pattern is more of a decorative technique that does not pertain to how valleys are formed. Finally, shingles from both sides overlapping equally is more characteristic of an open valley design, where the valley is left exposed to better manage water flow, contrasting with the closed valley technique.