What Is Timber?
The wood which is suitable for engineering purposes or construction is called timber. The word timber is derived from an old English word ‘timbrian’, which means ‘to build’.

A piece of timber may have a defect in it that reduces its structural adequacy but enhances its aesthetic qualities.

A defect in timber is an irregularity or abnormality occurring in or on wood that is responsible for its-

Strength reduction
Lowering of durability
Lowering of utility
Poor Appearance
Decay
Classification of Defects In Timber
list the common defects in timber,

Natural Forces Insects
Seasoning Defects
Fungi Defects