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As previously noted, less wood is needed to produce a given finished size than when standards called for the green lumber to be the full nominal dimension. However, even the dimensions for finished lumber of a given nominal size have changed over time. In 1910, a typical finished 1-inch (25 mm) board was 13 ⁄ 16 in (21 mm). In 1928, that was ...
Note: see dimensional lumber for a full discussion of the relationship of actual and nominal dimensions. Briefly, for softwoods, to convert nominal to actual, subtract 1 ⁄ 4 inch (6 mm) for dimensions under 2 inches; subtract 1 ⁄ 2 inch (13 mm) for dimensions over 2 inches and under 8 inches; and subtract 3 ⁄ 4 inch (19 mm) for larger ...
The nominal size may not match any dimension of the product, but within the domain of that product the nominal size may correspond to a large number of highly standardized dimensions and tolerances. Nominal sizes may be well-standardized across an industry, or may be proprietary to one manufacturer. Applying the nominal size across domains ...
The exact volume of wood specified is variable and depends on the type of lumber. For planed lumber the dimensions used to calculate board feet are nominal dimensions, which are larger than the actual size of the planed boards. See Dimensional lumber for more information on this.
Parallel-strand lumber (PSL) is a form of engineered wood made from parallel wood strands bonded together with adhesive. It is used for beams, headers, columns, and posts, among other uses. It is used for beams, headers, columns, and posts, among other uses.
The timber industry states that finishing and drying the lumber results in the nominal size differing from the actual size, however, you will find that many houses built prior to 1950 usually have timber where the actual size and nominal size are the same.