Softwood Lumber - Grading
Rough lumber, surfaced lumber (dressed), worked lumber, shop and factory lumber and yard lumber.
Rough Lumber
Sawn, trimmed and edged lumber. The faces are rough with saw marks.
Surfaced Lumber
Rough lumber smoothed by surfacing machines. Subcategories based on the number of sides and edges that have been smoothed.
- S1S - Surfaced on 1 Sides
- S2S - Surfaced on 2 Sides
- S3S - Surfaced on 3 Sides
- S4S - Surfaced on 4 Sides
- S1E - Surfaced 1 Edge
- S2E - Surfaced 2 Edges
- S1S1E - Surfaced 1 Side and 1 Edge
- S1S2E - Surfaced 1 Side and 2 Edges
Note that S4S lumber planed and surfaced all four sides will be noticeably less than in its nominal dimension.
Worked Lumber
Surfaced lumber that has been matched and patterned.
Shop and Factory Lumber
Millwork lumber - used for molding, door jambs and windows frames.
Structural Lumber or Yard Lumber
Yard lumber used for house framing, sheathing, concrete forms.
Yard lumber or structural softwood lumber is subdivided in
- Boards - no more than 1 inch thick and 4-12 inches wide
- Planks - more than 1 inch thick and more than 6 inches wide
- Timbers - width and thickness greater than 5 inches
Related Topics
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Miscellaneous
Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.
Related Documents
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Angle Calculator - Carpenter's Square
Calculate angles with a straight board across carpenter's square. -
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Lumber and surface finishing abbreviations. -
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Commercial softwood lumber dimension chart - nominal and actual sizes. -
Softwood Lumber - Standard Sizes
Nominal and minimum-dressed lumber sizes. -
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Basic size, area, moments of inertia and section modulus for timber - metric units. -
Structural Lumber - Properties
Properties of structural lumber. -
Wood Beams - Strength of Material
Bending and compression strength of wood species used in beams. -
Wood Species - Densities
Densities of various wood species - apple, ash, cedar, elm and more. -
Wood Species - Moisture Content and Weight
Weight of green and air-dried fire wood.