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Softwood Lumber - Grading

Rough lumber, surfaced lumber (dressed), worked lumber, shop and factory lumber and yard lumber.

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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.

s4s wood lumber

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.

Actual lumber dimensions

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

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Related Topics

Miscellaneous - Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more

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Engineering ToolBox, (2009). Softwood Lumber - Grading. [online] Available at: https://www.engineeringtoolbox.com/s4s-wood-d_1454.html [Accessed Day Mo. Year].

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