How much does Interior Douglas Fir lumber weigh?
A Douglas Fir (Int.) 2×4, 8 ft weighs at 12% moisture content, kiln-dried.
34.7 lb/ft³ · 5.33 bd ft ·
Interior Douglas Fir is a softwood with a basic specific gravity of 0.46 (ovendry mass over green volume, USDA Wood Handbook Table 5-3b) — 34.7 lb/ft³ once dried to 12% moisture content. Its Janka side hardness is 660 lbf, the 19th hardest of the 46 species on this site. Green, freshly cut moisture content runs 37% in the heartwood to 115% in the sapwood. Total shrinkage from green to ovendry runs about 10.7% by volume.
Interior Douglas Fir weight by size
| Size | Actual (dry) | 8 ft, 12% MC | Per foot | Green range |
|---|---|---|---|---|
| 2×2 | 1-1/2″ × 1-1/2″ | 4.3 lb | 0.54 lb/ft | 5.3–8.4 lb |
| 2×3 | 1-1/2″ × 2-1/2″ | 7.2 lb | 0.90 lb/ft | 8.8–13.7 lb |
| 2×4 | 1-1/2″ × 3-1/2″ | 10.1 lb | 1.27 lb/ft | 12.2–19.1 lb |
| 2×6 | 1-1/2″ × 5-1/2″ | 15.9 lb | 1.99 lb/ft | 19.2–30.1 lb |
| 2×8 | 1-1/2″ × 7-1/4″ | 21.0 lb | 2.62 lb/ft | 25.6–40.2 lb |
| 2×10 | 1-1/2″ × 9-1/4″ | 26.7 lb | 3.34 lb/ft | 32.4–50.9 lb |
| 2×12 | 1-1/2″ × 11-1/4″ | 32.5 lb | 4.07 lb/ft | 39.3–61.6 lb |
| 4×4 | 3-1/2″ × 3-1/2″ | 23.6 lb | 2.95 lb/ft | 27.7–43.5 lb |
| 6×6 | 5-1/2″ × 5-1/2″ | 58.3 lb | 7.29 lb/ft | 66.1–104 lb |
Board-to-board variation of ±10-15% is normal even within one species and size. How these numbers are computed.
Related
- All species: wood species index
- By density: Lighter: American Elm (SG 0.46) · Denser: Sweetgum (SG 0.46)