Nominal dimensions are the green, rough, un-planed dimensions of lumber. “Rough”, sometimes also referred to as “full cut rough”, is defined as wood that is not dried or planed.

The NOMINAL dimensions are the common descriptors we use for lumber.

These are some examples of the common “two-by” nominal dimensions and their actual dimensions:

2 by 2 is actually 1½ inches by 1½ inches
2 by 4 is actually 1½ inches by 3½ inches
2 by 6 is actually 1½ inches by 5½ inches
2 by 8 is actually 1½ inches by 7¼ inches
2 by 10 is actually 1½ inches by 9¼ inches
2 by 12 is actually 1½ inches by 11¼ inches

And, here are some large lumber and smooth timber dimensions…

4 by 4 is actually 3½ inches by 3½ inches
4 by 6 is actually 3½ inches by 5½ inches
6 by 6 is actually 5½ inches by 5½ inches
8 by 8 is actually 7¼ inches by 7¼ inches

These are industry standard dimensions used for design and planning purposes.

Full-cut, rough lumber will typically be true to size but you should always verify with your lumber or timber supplier if you aren’t completely sure.

Learn more: [ Ссылка ]

свернуть