Lumber

  

Framing/Dimensional

Dimensional or Framing lumber is a term used for lumber that is finished/planed and cut to standardized width and depth specified in inches. Examples of common sizes are 2×4 (pictured, also two-by-four) and 2×6, and 4×4. The length of a board is usually specified separately from the width and depth. It is thus possible to find 2×4s that are four, eight, or 12 feet in length. In the United States and Canada the standard lengths of lumber are 6, 8, 10, 12, 14, 16, 18, 20, 22, and 24 feet. For wall framing, “stud,” or “precut” sizes are available, and commonly used. For an eight, nine, or ten foot ceiling height, studs are available in 93 inches, 105 inches, and 116 5/8 inches. (Because the term “stud” is used inconsistently when referring to length, care should be taken to always specify the exact, actual length required.) 

Finish boards

  • C&B Clear (1″ Clear of knots or better grade)
  • #2 Boards (1″ boards with small knots)

                                       North American softwood ACTUAL dimensional lumber sizes

Nominal (in)

Actual

Nominal (in)

Actual

Nominal (in)

Actual

1 × 2 34 in × 1 12 in 2 × 2 1 12 in × 1 12 in 4 × 4 3 12 in × 3 12 in
1 × 3 34 in × 2 12 in 2 × 3 1 12 in × 2 12 in 4 × 6 3 12 in × 5 12 in
1 × 4 34 in × 3 12 in 2 × 4 1 12 in × 3 12 in 6 × 6 5 12 in × 5 12 in
1 × 6 34 in × 5 12 in 2 × 6 1 12 in × 5 12 in 8 × 8 7 14 in × 7 14 in
1 × 8 34 in × 7 14 in 2 × 8 1 12 in × 7 14 in    
1 × 10 34 in × 9 14 in 2 × 10 1 12 in × 9 14 in    
1 × 12 34 in × 11 14 in 2 × 12 1 12 in × 11 14 in    

 

 

This is for planed lumber. Rough sawn lumber are the actual sizes a 2″x4″ board measures 2″x4″ but is not smooth to the touch. A common application would be timber framing or a barn.