wane

A wane is a defect on the edge or corner of a piece of lumber where wood is missing, typically because the board was cut from near the outer edge of the log and the natural curvature of the tree was left in place. The missing section often exposes bark or the transition zone between bark and sapwood, creating a rounded or beveled edge instead of a sharp corner. Wanes are graded by size, location, and depth, and they directly affect the usable yield from a log.

Wane appears most commonly on the corner edges of squared lumber and on the top edge of flat-sawn boards. A board with wane on all four edges is called waney or wany. The size is usually measured as a percentage of the edge length or as a linear distance along the board. A small wane on a non-structural edge may be cosmetically acceptable in some applications, but structural members or finished pieces typically cannot tolerate it. A deep wane that removes more than 5 to 10 percent of the cross-sectional area may disqualify the board entirely.

Sawyers leave wane in place deliberately to maximize board length and minimize waste, especially with lower grades or when log diameter is small. Removing the wane requires additional milling that reduces yield and increases cost. However, wane must be removed before a board can be sold as a high grade or used in applications such as furniture, flooring, or structural framing that demand a complete edge.

Woodworkers and fabricators must account for wane during layout and planning. Widths and lengths must be cut from the usable central section of the board, and waned edges must be planed, sanded, or ripped away entirely. On occasion, a slight wane can be incorporated into design, such as a natural edge on a tabletop, but this is a design choice rather than an accident of milling.

The term comes from Old English and German roots meaning to lessen or diminish. It distinguishes the visible loss of material from skip, which is an absence of wood beneath the surface, and from checks, which are cracks caused by drying. Wane is listed in lumber grading standards and is one of the most common reasons a board is downgraded or rejected at the mill.