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Winding sticks assist in viewing this defect. curl: a warp in the center that creates a sort of bow; Wood warping costs the wood industry in the U.S. millions of dollars per year. [citation needed] Straight wood boards that leave a cutting facility sometimes arrive at the store yard warped.
Lumber is wood that has been processed into uniform and useful sizes (dimensional lumber), including beams and planks or boards. Lumber is mainly used for construction framing , as well as finishing (floors, wall panels , window frames ).
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]
'Dry rot' is an 18th-century term that generally described what is now called brown rot.The term was used because the damage was present in cured or dried timber of ships and buildings and was thought to be caused by internal ‘fermentations’ rather than water.
Since internal defects are determined by external indications, scaling is not an exact science and is subject to interpretation of log scaling rules. The log scaler is subject to random "check scales" in which another scaler rescales exactly the same logs and the results are compared.
Lumber’s price drop has been particularly dramatic in just the last 90 days in the futures market, with contract prices for July falling 28% to $466 per thousand board feet (futures prices are ...
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.
Wood to be used for construction work is commonly known as lumber in North America. Elsewhere, lumber usually refers to felled trees, and the word for sawn planks ready for use is timber. [46] In medieval Europe oak was the wood of choice for all wood construction, including beams, walls, doors, and floors.