What is the true thickness of a 1×6?
What is the true thickness of a 1×6?
Nominal vs. Actual Measurements of Dimension Lumber
| Nominal Size | Actual Size |
|---|---|
| 1 x 4 | 3/4 x 3 1/2 inches (19 x 89 mm) |
| 1 x 5 | 3/4 x 4 1/2 inches (19 x 114 mm) |
| 1 x 6 | 3/4 x 5 1/2 inches (19 x 140 mm) |
| 1 x 8 | 3/4 x 7 1/4 inches (19 x 184 mm) |
How wide is a 1×6 trim board?
Nominal vs. Actual
| 1x Lumber | |
|---|---|
| 1×4 | 3/4 x 3-1/2 |
| 1×6 | 3/4 x 5-1/2 |
| 1×8 | 3/4 x 7-1/4 |
| 1×10 | 3/4 x 9-1/4 |
When did lumber dimensions change from actual to nominal?
Early concepts called for rough lumber to be of full nominal size, often in the dry condition. After World War I, the increasing demand for construction 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.
What are the actual dimensions of lumber?
Common Dimensional Lumber Sizes
| Dimensional Lumber: Nominal Size vs. Actual Size | |
|---|---|
| Two-by-four or 2 x 4 | 1 1/2 inches x 3 1/2 inches |
| Two-by-six or 2 x 6 | 1 1/2 inches x 5 1/2 inches |
| Two-by-eight or 2 x 8 | 1 1/2 inches x 7 1/4 inches |
| Two-by-ten or 2 x 10 | 1 1/2 inches x 9 1/4 inches |
How wide is a 1×4 board?
Common Lumber Dimensions
| Nominal Size | Actual Size |
|---|---|
| 1×3 | 3/4″ x 2-1/2″ |
| 1×4 | 3/4″ x 3-1/2″ |
| 1×6 | 3/4″ x 5-1/2″ |
| 1×8 | 3/4″ x 7-1/4″ |
Why is lumber not true to size?
Maybe you’ve noticed that lumber sizes are often misleading. The “nominal” cross-section dimensions of a piece of lumber, such as 2 X 4 or 1 X 6, are always somewhat larger than the actual, or dressed, dimensions. The reason is that dressed lumber has been surfaced or planed smooth on four sides (called S4S).
When did they stop using true 2×4?
Size standards, maximum moisture content, and nomenclature were agreed upon only as recently as 1964. The nominal 2×4 thus became the actual 1½ x 3½, imperceptibly, a fraction of an inch at a time. It was a 34 percent reduction in actual volume; as those in the trade would say, it’s “selling air.”
What is the difference between nominal and actual sizes in lumber?
The nominal measurements are a board’s size before it has been planed smooth (surfaced) on all 4 sides. The actual measurements are the final size. If your project calls for precise measurements, be sure to check your lumber before purchasing.