Lineal High Grader X Checks X ![]() Splits X ![]() Bow X ![]() Crook X ![]() Cup X ![]() Twist X ![]() Lumber Characteristics - Seasoning Defects:
![]() Checks Small lengthwise separations of wood, caused by rapidly evaporating moisture from the surface of the wood. ![]() Splits Lengthwise separation of wood running from one face to other. Caused by severe checking or pressure in the planer on a cupped board. ![]() Bow Is a deviation flatwise from a straight line drawn end to end. Measured at the point of greatest distance from the line. ![]() Crook Is a deviation edgewise from a straight line drawn end to end. Measured at the point of greatest distance from the line. ![]() Cup Is a deviation in the face from a straight line drawn edge to edge. Measured at the point of greatest distance from the line. ![]() Twist Is a deviation flatwise, or a combination of flatwise and edgewise in the form of a curl. Measured as the distance one edge of the piece is raised above a flat surface. | ||