Typical Defects of Wood

Knots

The classification of knots is far from straightforward, as their classes often depend on the quality standards being applied and the end-use of the wood material.

Sound knots (normal, edge, leaf, and horn):


Dry knots (normal, edge, leaf, and horn):


Encased knots (normal, edge, leaf, and horn):


Decayed knot:


Knot hole:

Resin pocket, core stripe, split, and wane:



Blue stain, brown stain, bark pocket, and mould: