Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Softwood Lumber - Grading

Sponsored Links

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
Sponsored Links

Related Topics


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

Related Documents

Angle Calculator - Carpenter's Square

Calculate angles with a straight board across carpenter's square.

Board Feet Chart and Calculator

Board feet is used as a volume measurement of lumber.

Glue-Laminated Timber - Dimensions

Common sizing of glue-laminated timber.

Grit Size vs. Surface Roughness

Comparing sandpaper grit size and surface roughness.

Hardwood and Softwood Species

Species of hardwood vs. softwood.

Hardwood Lumber - Dimensions

Sizing of hardwood lumber.

Horizontal Roof Rafters - Maximum Spans

Douglas Fir in horizontal roof rafters and maximum spans.

Lumber - Surface Finishing

Lumber and surface finishing abbreviations.

Lumber - Weights

Weights of green, kiln dried and pressure treated lumber boards.

Maximum Floor Joist Span

No. 1 and No. 2 Grade of Douglas fir and maximum span floor joists - imperial units

Miter Saw - Calculate Sawing Angle

Calculate miter saw protractor angles for skirting and decorative mouldings work.

Softwood and Hardwood - Structural Strength Classes

Strength classes, bending stress and mean density of hardwood and softwood

Softwood Lumber - Dimensions

Commercial softwood lumber dimension chart - nominal and actual sizes.

Softwood Lumber - Standard Sizes

Nominal and minimum-dressed lumber sizes.

Structural Lumber - Section Sizes

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.

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!


We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.