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Timber is one of the most widely used materials in construction due to its versatility, strength, and aesthetic appeal. However, like any natural material, timber is prone to various defects that can affect its structural integrity, durability, and appearance. Understanding these defects is crucial for proper selection, treatment, and maintenance of timber in building and construction work. Defects in timber can be broadly categorized into natural defects, seasoning defects, and defects caused by external factors such as insects, fungi, and mechanical damage. Natural defects are inherent in the wood as a result of its growth patterns and environmental conditions during the life of the tree. One common natural defect is knots, which are portions of branches that become embedded in the tree trunk. Knots can weaken timber, particularly when they are loose or large, and may lead to uneven surfaces. Another natural defect is shakes, which are splits along the growth rings of timber caused by ________ ____ ____ __________ ___ ______ ________ ___ ______ _________.
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