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Valley
A valley is the area where two roof planes meet and water concentrates.
Why it matters
Valleys handle a lot of water. Poor valley details cause leaks fast.
Where people get this wrong
A valley is not just shingles. It needs a specific water management detail. Debris buildup can make a good valley act like a bad one.
Real-world example
Leaves pile in a valley and water overflows during storms. That water finds the weakest seam and you get a leak.
Where this hits your build
This term shows up during construction and affects decisions that are hard to reverse once the work moves forward. Understanding it now saves time, money, and frustration later.
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