What is lumber sorting?

lumber sorting is a system for evaluating the appearance or strength of a piece of wood. The degree refers to the purpose for which the lumber is considered acceptable or the percentage of undepler or clear wood available from the plate of specific dimensions. Defects usually include nodes, spots and distribution that endanger the appearance of the board or its structural integrity. Hard wood, such as oak and maple, are classified differently than Softwoods and individuals who are sorting of timber on hard wood do not require any official certification. Softwoods, such as pine and spruce, are often used in building a building and must be evaluated by certified comparators.

In the US, the hardwood wood is established by the National Wood Wood Association, while the US Department of Trade releases US Standards of Lumber Softwood. The lumber sewer usually appears on the lumber itself. Soft wood is generally more consistent than hardwood.

dending about the amount of desired wood withoutDefects are commonly used for different projects for different hardwood wood. Long pieces of decorative moldings require longer pieces of clear wood, while for furniture and cabinet there are needed shorter pieces. Likewise, the defects of the appearance are less important if the wood is to be painted.

Hard wood

is graded on the basis of the percentage of surface surface without defects, which can be obtained from the factor side of the board. For example, the highest grade of hardwood must have a minimum length of 8 feet (2.43 m) and a minimum width of 6 inches (15.24 cm) and must be reduced to four clear wood in the range of 3 x 7 inches (7.62 x 17.78 cm) to 4 x 5 inches (10.16 x 12.7 cm). If both faces of the Board of Directors meet this requirement, it is first and seconds (FAS).

lumber, which is sorted by FAS-1st FAS lumber is often used face (FA1) or selection. The FA1 lumber lumber has one side that SPIt lines the FAS criteria, but the side with the lowest percentage of clear wood meets only the common class 1. Select the lumber meets the surface area requirements for normal number 1, but otherwise meets FAS criteria.

Numbers of common degrees 1, 2a, 2B, 3A and 3B for hardwood require less total surface surfaces and lower percentage of clear wood than FAS lumber. The percentage of pure wood requires a reduction in the degree of decreasing, and from a normal 2B degree, clear wood can include "sound" defects, including stains and intact knots. Number 1 Common is also called building class and it is the class most commonly used to build furniture, while number 2a is considered acceptable for the cabiket and 2b for painting.

Smoothing of soft wood timber can only be based on structural integrity or a combination of structural integrity and appearance. Stress or dimensoftwood Sion is mainly used in building buildings and is only evaluated on the basis of mechanical properties such as bending strength. DRescuers and craftsmen most often use either NEBSTERSS-GRASED or visually obtained soft wood, which are classified for a combination of strength and appearance. Unlike hardwood wood sorting, Softwood timber is sorted on the least defective or best side of the board.

non -party or conventional graded soft wood is sorted for strength and appearance, although strength is the primary consideration and appearance is less weight, as the degree decreases. The highest level is number 1 and has the smallest defects. Grade 3 and below are used only if the appearance is not important.

Softwood, which is classified primarily for appearance, is called Select Lumber and is graded as a selection of A, B, C or D, as the number of defects in the board increases. However, even the selection of class D should contain only small defects. When offered for sale, stamps and B are sometimes combined and marked "B & BTR", which means B and better.

strength and various other mechanical criteria are used to assess soft wooda. The appearance does not take into account. This timber will only be used for construction and will not be visible when the construction is completed.