A closed cut roof valley will have at least four layers of roof materials.
Roof hog valley.
The hog valley is much wider at the top than the bottom.
And damaged flashing is behind most roof leaks.
The open woven and closed cut methods are demonstrated.
Weaving a shingle valley by dunn contracting 727 410 5717 james dunn.
In either situation the leaking roof valley can be fixed by removing affected shingles and structural elements and upgrading your roof s flashing.
Closed cut shingle valleys work fine with strip shingles and laminated asphalt shingles.
A hog valley is a section of roof that is usually a lower pitch or angle of roof that collects a lot of water from the other two steeper roofs that flow into it.
One layer each of felt underlayment mineral surfaced roll roofing and two layers of shingles.
Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.