Attic Wood defect

The first time I looked at that picture, I thought the same as Robert. Once Brian did the closeup, I see the bracing now. It can be an optical illusion for some of us.

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Same here, Tom…odd.

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Sounds like several agree that JJ was correct.

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Huh? Adjustments are always made. Unprecise marking by 1/16" can compound or not placing the framing members exactly on the marks can throw off the layout for the sheathing. And then some of the boards will have a twist that has to be dealt with. Wood is rarely straight and that requires adjusting the boards as the sheathing goes down.
As a side note, I hear everyone complain about the crummy quality of lumber today, but forty years ago, we complained as much as today. Wood is not a precise building medium. Any of us who have done construction have seen a straight board take a turn within minutes after cutting the bands off a bundle. When I replaced my deck, some of the planks that had been held in a straight line for twenty years, immediately warped when no longer constrained.