Defects In LumberManufacturing 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› Warping in lumber where the

ends twist in opposite directions.

Defects

Loose Knot

Tight Knot

Defects

Loose Knot Tight Knot

Defects Split

› A longitudinal separation of the fibers which extends to the opposite face.

Defects

Checking› A crack in the wood structure of a

piece, usually running lengthwise.

Defects Wane

› bark or absence of wood on corners

Defects Pitch Pocket

› An accumulation of sap on the surface or in pockets below the surface of wood.

Defects Grub Hole

› One 1/4 inch in diameter or larger.

Defects

Machine/Burn Marks› Discoloration and roughness to the

wood