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Apart from structural wood preservation measures, there are a number of different chemical preservatives and processes (also known as timber treatment, lumber treatment or pressure treatment) that can extend the life of wood, timber, and their associated products, including engineered wood. These generally increase the durability and resistance ...
Arising in cut timber they generally cause a reduction in strength. When found in a log they can result in a significant amount of waste, when a log is converted to lumber. Apart from heart shakes, often found in trees felled past their best, shakes in a log have no effect on the strength of shake free lumber obtained therefrom. [1]
Wood slabs can also become warped as a result of insufficient support from underlying shelf hardware (commonly referred to as sagging or bowing). [2] The types of wood warping include: bow: a warp along the length of the face of the wood; crook: a warp along the length of the edge of the wood; kink: a localized crook, often due to a knot
Detailed design / hardware: analysis of products prior to production. These are the most detailed (in MIL 1629 called Piece-Part or Hardware FMEA) FMEAs and used to identify any possible hardware (or other) failure mode up to the lowest part level. It should be based on hardware breakdown (e.g. the BoM = bill of materials).
Bark pockets are considered a nuisance in the lumber industry because they are considered a defect, and lower the grade of the wood. [1] Bark pockets can also weaken tree forks , and can result in damage to the junction under stress.
Natural durability is the inherent capability of wood to tolerate and resist fungal decay and insect attacks, such as woodboring beetles and termites, and marine organisms. [45] This protective feature is attributable to specific biological compounds, called extractives that are toxic to wood-destroying organisms.
Natural insulation: lumber is a natural insulator which makes it particularly good for windows and doors. Less construction time, labor costs, and waste: it is easy to manufacture prefabricated lumber, from which pieces can be assembled simultaneously (with relatively little labor). This reduces material waste, avoids massive on-site inventory ...
There are two types of drying defects, although some defects involve both causes: Defects from shrinkage anisotropy, resulting in warping: cupping, bowing, twisting, crooking, spring and diamonding. Defects from uneven drying, resulting in the rupture of the wood tissue, such as checks (surface, end and internal), end splits, honey-combing and ...
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