Timber is one of the most widely used natural building materials due to its versatility, aesthetic appeal, and structural properties. However, like any natural material, timber is prone to defects, which can affect its strength, durability, and appearance. Understanding these defects is crucial for proper selection, use, and maintenance in construction and carpentry. Timber defects can be broadly classified into two main categories: natural defects and defects caused by seasoning, handling, or use. Natural defects are inherent in the timber due to the growth and development of the tree. One of the most common natural defects is knots, which occur where branches were attached to the trunk. Knots can be classified as live or dead knots. Live knots are firmly embedded and may not significantly weaken the timber, while dead knots are loose and may cause structural weakness. Knots can also affect the aesthetic appearance of timber and may interfere with smooth planing or finishing. Another common natural defect is shakes, which are cracks along the grain of the wood. Shakes can be classified into heart shakes, which originate from the heartwood and extend outward, and cup or ring shakes, which run along the annual growth rings. Shakes reduce the strength of timber and may lead to failure under load if present in structural members. Warping is another defect resulting from uneven growth or drying of the timber. Warping can take several forms, including bowing, where the timber