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  • Costs and weight I'd say. Somebody who understands material science better than me will likely correct me, but a rectangular cross section (with the long edge vertical) will be stiffer than a square cross section of similar cross sectional area. So I'd rather use a 2x4 in that fashion than a 3x3 for the same/similar volume/weight of timber.

  • But would a 2x4 be stiffer than a 4x4? I want to be able to stand on the edge in the centre and possibly jump.

    My reasons are my own.

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