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OSB boards often have a stamp that says "strength axis" with an arrow, usually parallel with the longer dimension of the board.

What is this strength axis? Should it be parallel or perpendicular to supporting joists? Why does OSB have a strength axis? I thought the point of OSB was supposed to be that it has randomly oriented strands so that you don't have to deal with things like wood grain direction.

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What is "strength axis" on OSB boards? Question

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