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International building code suggests that when singles
are cut back in valleys there should be 12 inch overlap
and nails should be 6 inches from the edge. Even with that
said, shingle should have sealant under the cut edge to
prevent driving rain or other conditions causing water to
back up. A lot of water collects on your roof during a
heavy rain and water will start to travel sideways instead
of straight down. When not sealed, we have found that even
nails 6 inches back from the valley will be rusty in 10
years. Most of our roofs are done with the cut back
valleys....
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