Dimension lumber is structural softwood lumber. It is produced in thickness and widths in multiples of 2 nominal thickness. The nominal thickness is the dimension of the piece in the green, rough sawn state before it is dried and surfaced. The lumber is usually dried and surfaced (planed) such that the actual dimensions of the solid wood are less than the nominal ones.

Spruce-Pine-Fir (SPF) is the major species group from which dimension lumber is produced but Douglas-fir-Larch and Hem-fir are also used. Dimension lumber is grouped into four categories; structural light framing (2-4 thick, 2-6 or more wide), structural joists and planks (2-4 thick, 5 or more wide), light framing (2-4 thick, 2-4 wide) and studs (2-4 thick, 2-6 wide and 10 feet or less long). Within each of these groups there are a number of different grades. Dimension lumber is usually visually graded based on the quantity of natural characteristics present in the wood (e.g., size and location of knots, slope of grain, checks, wane, warp and manufacturing defects).

  • Kiln Dried SPF, Spruce-Pine-Fir
  • Kiln Dried Fir/L, Fir Larch
  • Kiln Dried Hem/Fir, White Fir
  • Kiln Dried Lodge Pole Pine
  • Kiln dried, 19% MC, moisture content
  • Some Green Douglas Fir and Green Hemlock
  • Select Structural, J-Grade, 2/Btr, Utility, #3, Economy
  • 2x3, 2x4, 2x6, 2x8, 2x10, 2x12
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