Lumber's nominal dimensions are larger than the actual standard dimensions of finished lumber. Historically, the nominal dimensions were the size of the green (not dried), rough (unfinished) boards that eventually became smaller finished lumber through drying and planing (to smooth the wood).
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Rough sawn lumber comes in "true" thicknesses as reflected by the "quarters" size. Lumber sized according to "Quarters" reflects the number of quarters of an inch thick the lumber is. To figure the thickness of a board referenced in "quarters" sizes, simply divide the second number (4) into the first number.
Commercial Lumber Sizes Chart Table. ... which set specifications for lumber dimensions, grade, and moisture content; it also developed inspection and accreditation programs. ... The Canadian Lumber Standards Accreditation Board (CLSAB) monitors the quality of Canada's lumber grading and identification system.
If you find reading plans and wood board sizes confusing or have trouble identifying the exact dimensions of wood at a lumberyard or home center, read on. Most lumber is sold in “nominal” (in name only) sizes such as 1×3, 2×4, 4×4 and2x2 lumber.
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Lumber Buying Guide. ... Save Item. Send to a Friend Print. Lumber Definitions. Lumber is sold in various forms, sizes, types and cuts. These characteristics are used to describe the different types of lumber; certain projects may require one or more of these specific traits. ... Boards can be stained or painted. Larger boards may be edge-glued ...
Hardwood Lumber Dimensions. Hardwood lumber is sized based on how many sides are surfaced. Surfaced refers to a finishing process that smooths the lumber to remove all saw marks. In North America, hardwood lumber is usually specified using the quarter system, where a board is identified by its thickness in quarters of an inch.