| Type of Lumber | Nominal size (in inches) | Actual size (in inches) | ||
|---|---|---|---|---|
| Thickness | Width | Thickness | Width | |
| Dimension | 2 | 4 | 1 1/2 | 3 1/2 |
| 2 | 6 | 1 1/2 | 5 1/2 | |
| 2 | 8 | 1 1/2 | 7 1/4 | |
| 2 | 10 | 1 1/2 | 9 1/4 | |
| 2 | 12 | 1 1/2 | 11 1/4 | |
| Timbers | 4 | 6 | 3 1/2 | 5 1/2 |
| 4 | 8 | 3 1/2 | 7 1/4 | |
| 4 | 10 | 3 1/2 | 9 1/4 | |
| 6 | 6 | 5 1/2 | 5 1/2 | |
| 6 | 8 | 5 1/2 | 7 1/4 | |
| 6 | 10 | 5 1/2 | 9 1/4 | |
| 8 | 8 | 7 1/4 | 7 1/4 | |
| 8 | 10 | 7 1/4 | 9 1/4 | |
| Common boards | 1 | 4 | 3/4 | 3 1/2 |
| 1 | 6 | 3/4 | 5 1/2 | |
| 1 | 8 | 3/4 | 7 1/4 | |
| 1 | 10 | 3/4 | 9 1/4 | |
| 1 | 12 | 3/4 | 11 1/4 | |