The nominal size is used when discussing lumber nearly 100 of the time. Mechanical tolerance variations of lumber.
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Same for 1×4 2×4 and 4×4 etc.
2×6 actual size lumber. When the board is first rough sawn from the log it is a true 2×4 but the drying process and planing of the board reduce it to the finished 15×35 size. Actual board sizes in inches nominal size. Measure the actual width and thickness of a pine board like a 2×4 and then look at the sign above the rack.
2x4s are not actually 2 inches by 4 inches. Something doesnt quite match up. 1 x 1 34 x 34 1 x 2 34 x 1 12 1 x 3.
Usually there is 12 inch difference in measurements over 2 inches and 14 inch in measurements less than 2 inches. In reality these measurements are not a true measurement of the lumber thickness or width. Commercial lumber sizes chart table.
A 2x6s real or true dimension is 15 x 55 within the industry it is referred to as its actual size. The true measurement of a 2×4 is actually about 15×35. We recognize such sizes as 2×4 2×6 4×4 1×2 etc.
When the inch symbol is used is lumber measurements it indicates that you are referring to the actual size. If you can stop someone in the store to help explain the inconsistency theyll start throwing around a few words like nominal sizes and actual sizes and softwood lumber and hardwood lumber. Dimensional lumber is cut to a specific length width and depth.
Those are its nominal dimensions. The tables below provide both the nominal and actual sizes so many common north american lumber sizes. Actually the nominal size is often never the actual size.
Voluntary product standard ps 20 05 american softwood lumber standard. 1×4 are 34 x 312 2×4 are 112 x 312. Actual sizes and dimensions of lumber.
Thus the nominal size of the lumber you purchase is different from the actual size. Its actual dimensions are smaller. The following data is standard reference and size data for commercially available lumber within the usa.
However there is a difference between the nominal size what the lumber is referred to and the actual size. Dimension lumber can be purchased as dry or green. This measurement refers to the thickness and width of the lumber and the length varies.
A two by six board you purchase at a home improvement center doesnt measure 2 inches thick and 6 inches wide. All data is in imperial units inches. Here are the common sizes of lumber and their actual sizes.
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