In either situation the leaking roof valley can be fixed by removing affected shingles and structural elements and upgrading your roof s flashing.
Roof hog valley.
And damaged flashing is behind most roof leaks.
Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
Closed cut shingle valleys work fine with strip shingles and laminated asphalt shingles.
One layer each of felt underlayment mineral surfaced roll roofing and two layers of shingles.
A flashing is a transitional roofing material that connects the roof material to some other building material or to another part of the roof.
There is usually a wall that this valley meets at the narrow end causing water to accumulate at.
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.
Valleys are a prime leak area so it s important to be careful.
A closed cut roof valley will have at least four layers of roof materials.