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1 Natural defects. Such as knots, oblique textures, and defects due to growth stress or natural damage. The knot is the part of the branch that is wrapped in the xylem when the tree grows. The oblique texture of the log is often referred to as a twist, and the sawn timber is called a twill.
2 Biological defects. There are mainly decay, discoloration and insects.
3 Defects caused by drying and machining. Such as dry cracking, warping, slash injury and so on. Defects reduce the value of wood use.
In order to use wood reasonably, the type, size and quantity of defects allowed in the wood are usually restricted according to the requirements of different uses, and the wood is classified. Decayed and wormed wood is not allowed to be used in construction, so the defects affecting structural strength are mainly knots, twill and cracks.