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Defects In Lumber

Defects In Lumber. Manufacturing II. Defects. Crook Warping along the edge from one end to the other. Defects. Bow A curve along the face of a board from end to end. Defects. Cupping Warping along the face of a board across the width of the board. Defects. Twist

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Defects In Lumber

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  1. Defects In Lumber Manufacturing II

  2. Defects • Crook • Warping along the edge from one end to the other.

  3. Defects • Bow • A curve along the face of a board from end to end.

  4. Defects • Cupping • Warping along the face of a board across the width of the board.

  5. Defects • Twist • Warping in lumber where the ends twist in opposite directions.

  6. Defects • Loose Knot • Tight Knot

  7. Defects Loose Knot Tight Knot

  8. Defects • Split • A longitudinal separation of the fibers which extends to the opposite face.

  9. Defects • Checking • A crack in the wood structure of a piece, usually running lengthwise.

  10. Defects • Wane • bark or absence of wood on corners

  11. Defects • Pitch Pocket • An accumulation of sap on the surface or in pockets below the surface of wood.

  12. Defects • Grub Hole • One 1/4 inch in diameter or larger.

  13. Defects • Machine/Burn Marks • Discoloration and roughness to the wood

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