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

A board with a deviation flatwise across its width has which defect?

That is cup.

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  1. Crook
  2. Cup ✔
  3. Twist

Why: Cup is a curve across the width of a board, like a shallow trough. Crook is a curve along the edge. Twist is when the corners do not sit in one plane.

Huh, didn't know that: Bow is the lengthwise deviation flat to the face.

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What's a tree's favorite dating app? Timber.
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References

Answer: Cup. Cup is a curve across the width of a board, like a shallow trough. Crook is a curve along the edge. Twist is when the corners do not sit in one plane.

  1. Wood Handbook: Wood as an Engineering Material, FPL-GTR-282 (USDA Forest Products Laboratory, 2021) research.fs.usda.gov/treesearch/62200
    A distortion of a board in which there is a deviation flatwise from a straight line across the width of the board.
    Checked 2026-10-10.

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