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| Closed-Cut Valley | A method of valley application in which shingles from one side of the valley extend across the valley while shingles from the other side are installed over the top of those and then trimmed back approximately 2 inches from the valley centerline. |
| Open Valley | A valley where both sides of the roof are trimmed back from the centerline to expose the valley flashing material beneath. |
| Valley | The internal intersection of two sloping roof planes that runs from the eaves to the ridge. This intersection collects the most water run-off. See Open Valley, Closed-Cut Valley, and Woven Valley. |
| Woven Valley | A valley construction whereby the valley has a woven look which is effected by overlapping alternate courses of shingles from both sides of the valley. |