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SESK: Stuff Everyone Should Know · sesk.info/wood-twist-definition

A board whose four corners no longer lie in the same plane has what defect?

That is twist.

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  1. Twist ✔
  2. Cup
  3. Crook

Why: Twist comes from a board's edges winding in opposite directions, so it rocks on a flat bench. Cup bends across the width and crook along the edge.

Huh, didn't know that: The extreme juvenile wood in a 10 foot board can try to shrink 2.4 inches lengthwise, which can cause severe warping.

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References

Answer: Twist. Twist comes from a board's edges winding in opposite directions, so it rocks on a flat bench. Cup bends across the width and crook along the edge.

  1. Wood Handbook: Wood as an Engineering Material, FPL-GTR-282 (USDA Forest Products Laboratory, 2021) research.fs.usda.gov/treesearch/62200
    A distortion caused by the turning or winding of the edges of a board
    Checked 2026-10-10.

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