Valleys are a prime leak area so it s important to be careful.
Roof hog valley.
There is usually a wall that this valley meets at the narrow end causing water to accumulate at.
Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.
And damaged flashing is behind most roof leaks.
One layer each of felt underlayment mineral surfaced roll roofing and two layers of shingles.
The hog valley is much wider at the top than the bottom.
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.
In either situation the leaking roof valley can be fixed by removing affected shingles and structural elements and upgrading your roof s flashing.
A flashing is a transitional roofing material that connects the roof material to some other building material or to another part of the roof.
The open woven and closed cut methods are demonstrated.