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Re: Rafter/ridge board
Please excuse my "artwork", but this is the kind of rafter damage that is best avoided by having a ridgeboard that fully accepts the bearing end of attached rafters. A fully bearing cut rafter end that is "tight" to the ridgeboard does not split but rather transfers its load to (and through) the ridgeboard to the complementary rafter on the other side (even when they are somewhat offset laterally at the ridgeboard).
With an engineered truss system, no ridgeboard is needed at all because there is no lateral offset allowed (by design) and the bearing faces of the rafters/upper cords are in complimentary alignment. But that’s another thread altogether!
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