A nominal 2x4 board starts out 1.56 in. All rights reserved. The tables below provide both the nominal and actual sizes so many common North American lumber sizes.

After the board is dried and planed it becomes its actual size of 1 1/2″x3 1/2″.If your memory is like mine, and you need a little help remembering the actual dimensions of the lumber you’ll need for your next project, then here is a In getting lumber at say Home Depot, the dem. 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. Definition of nominal dimension: Approximate or roughcut dimension by which a material is generally called or sold in trade, but which differs from the actual dimension. These are the most popular “nominal dimensions” and are the terms we are all used to hearing on TV shows and even in DIY deck building books. Nominal vs. Actual Measurements of Dimension Lumber However, what you need to know is that “nominal dimensions” refer to a piece of unfinished/rough lumber that has not yet been milled (aka surfaced).You see, during the milling process, every piece of decking gets smoothed out to remove any raised grains and splinters. Note the extra thickness over 1×6 decking material.5/4×4 Tongue & Groove is perfect for sunrooms, covered porches, and screened in lanais.This custom-milled rainscreen siding profile requires no predrilling and reduces water intrusion.Advantage 1×6 +Plus® is also available as a exterior wood siding option. ... a finished (dressed) 'two by four' piece is less than 2 inches thick and less than 4 inches wide. Other lengths and modules must be agreed separately. Certainly today, most timber is traded by the cubic metre, many companies machine these sections from sawn goods rather than buy them at source. Unlike lumber, which is nearly always sold in nominal …
Dimensional lumber is cut to a specific length, width, and depth.

As explained in the answer that Organic Marble dug up, aerospatial "nominal" is really a shorthand for something like within the allowed tolerances around the nominal (i.e. The second table shows the finished sizes. specified) value.We can speculate about how that shorthand evolved. Our 32x150mm decking is nominal size before profiling and treatment, meaning the actual finished size is approximately 27x145mm. If boards will be kiln dried …

Display and/or use of the information contained within this site constitutes acceptance of the It is important that all local codes and standards are adhered to. THIS DRIED PIECE IS TRIMMED TO ACTUAL DIMENSION. However, even the dimensions for finished lumber of a given nominal size have changed over time.

and the small tasks that require fiddly timber. 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.
Then, the edges are surfaced (planed), reducing the actual size to 1-1/2 in.

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.

If you’re looking to build a deck for the very first time, the first thing you need to know is how much decking to buy.

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