Nominal dimensions which identify certain board, beam or post do not represent its actual parameters. Lumber measurements in width and thickness normally 0.25 inches 6 millimeters 0.75 in 19 mm smaller than nominal sizes.
Lumber Dimensions. 2x4s are not actually 2 inches by 4 inches. When the board is first rough sawn from the log, it is a true 2x4, but the drying process and planing of the board reduce it to the finished 1.5x3.5 size.
Softwood Lumber Dimensions 2x Nominal. These boards lose 1/2 inch in thickness and 1/2 inch in width before leaving the mill. That means a 2 x 4 board is actually 1-1/2 inches by 3-1/2 inches.
The reasons why the nominal dimension of this lumber what the lumber is called is larger than the actual dimensions involves historical practices in the lumber industry. Originally, a "2 x 4" was cut as a rough green board that was exactly 2 x 4 inches in size, but by the time the boards were dried and planed, the boards were smaller
Then, after it is dried, the wood is planed to smooth the surface and make the wood a uniform size. Once planed, the wood is considered "finished." Thus, the nominal size of the lumber you purchase is different from the actual size.
nominal size do to loss of material when run through planer. 4/4, 4/8. etc. Actual dimensions of of lumber, 1 board foot is equal to 144 cubic inches, to
Dimensions mean nominal sizes with the moisture content of the sawn timber at 20%. The most common lengths vary between 2.7 m and 5.4 m in steps of 300 mm. Other lengths and modules must be agreed separately.
Dimensional lumber is cut to a specific length, width, and depth. However, there is a difference between the nominal size what the lumber is referred to and the actual size.
Commercial Lumber Sizes Chart Table The following data is standard reference and size data for commercially available lumber within the USA. All data is in imperial units Inches .
Most lumber is sold in nominal in name only sizes such as 1×3, 2×4 and 4×4. But these sizes are not the actual 1×3 dimensions, 2×4 dimensions, 2×6 dimensions, 2×8 dimensions and 4×4 dimensions of the wood.
What Is a 2x4's Real Size? At the lumberyard, board sizes are typically given in nominal dimensions, but those arent the true sizes. Which means, for example, three 2x4 boards laid side by side will not measure a foot across.
lumber led to the first national size standard in 1924. This was revised in 1926, 1928, 1939, and 1953, while still another revision is proposed for adoption in 1964.
Youll notice that at 8, the amount subtracted from the nominal size goes up to 3/4 so the actual size drops to 1/4. The reason for this is that wider boards shrink a greater amount. That is a 6 board may shrink 3/8 while an 8 and wider boards may shrink 1/2 or 5/8.
The most common nominal thicknesses of plywood are 1/2 inch and 3/4 inch, but once again the actual sizes are slightly different. A sheet of 1/2-inch plywood is really 15/32 inch thick, while a 3/4-inch sheet is 23/32 inch thick.
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 .
The nominal thicknesses of plywood range from 1/8 inch, or 3.2 mm, to 1 1/4 inches, which is equivalent to 31.75 mm. These often aren't the actual thicknesses, however, because sanding during manufacturing removes up to 1/32 inch of material.