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Nominal Lumber Sizes

Nominal Lumber Sizes

Lumber Dimensions – The actual sizes of common lumber sizes.. Nominal, Actual, Actual – Metric. 1" x 2", 3/4" x 1-1/2", 19 x 38 mm. 1" x 3", 3/4" x 2-1/2", 19 x 64 .
Lumber sizes are usually given in "nominal" measurements. The nominal measurements are a board's size before it has been planed smooth (surfaced) on all 4 .
In Canada and the United States, the standard lengths of lumber are 6, 8, 10, 12, 14, 16, 18, 20, 22 and 24 feet (1.83, 2.44, 3.05, 3.66, 4.27, 4.88, 5.49, 6.10, 6.71 and 7.32 meters). For wall framing, "stud" or "precut" sizes are available, and are commonly used.
Softwood Dimensional Lumber Sizes. Nominal, Actual, Nominal, Actual. 1 × 2, ¾″ × 1½″ (19×38 mm), 2 × 2, 1½″ × 1½″ (38×38 mm). 1 × 3, ¾″ × 2½″ .
General rule converting nominal to actual softwood dimensions. subtract 1/4 inch for dimensions under 2 inches (51 mm) subtract 1/2 inch for dimensions under 8 inches (200 mm) subtract 3/4 inch for larger dimensions.
Commercial Standard Lumber Sizes Table Chart. be less than than 1/8" (3.2mm) thicker or wider than the nominal finished thickness or width, except that 20% .

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