Consider the roof in question to be completely dried-in and ready for shingling with a closed-cut valley. When I start to shingle is it best for me to start in both sides of the valleys and work my way towards the Eve or hip? I.e, run the standard two rows of shingles all the way up one side of the valley(smaller side with less water flow first of course) and then go over to the other side of the valley and do the same and from there just run both sides of the valley out until they reach their rake or hip.
Or should I start at the valley on only one side(side with lesser water flow first of course) and then for the other side of the valley start from the rake or hip and work towards the valley?
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