Softwood and Hardwood - Structural Strength Classes
Structural timer is classified according the EU-code in different strength grades - where
- D-Classes - refer to Deciduous Tree Species
- C-Classes - refer to Coniferous Tree Species
Strength classes and structural softwoods and hardwoods physical properties:
| Strength Class | Characteristic Minimum Bending Strength - σ - (MPa) | Typical Density - ρ - (kg/m3) |
|---|---|---|
| C14 | 14 | 350 |
| C16 | 16 | 370 |
| C18 | 18 | 380 |
| C20 | 20 | 390 |
| C22 | 22 | 410 |
| C24 | 24 | 420 |
| C27 | 27 | 450 |
| C30 | 30 | 460 |
| C35 | 35 | 480 |
| C40 | 40 | 500 |
| C45 | 45 | 520 |
| C50 | 50 | 550 |
| D30 | 30 | 640 |
| D35 | 35 | 670 |
| D40 | 40 | 700 |
| D50 | 50 | 780 |
| D60 | 60 | 840 |
| D70 | 70 | 1080 |
- 1 MPa = 106 Pa
- BS EN 338
Use the Engineering ToolBox - SketchUp Extension - to add Construction Lumber to Your Models
Related Topics
• Beams and Columns
Deflection and stress, moment of inertia, section modulus and technical information of beams and columns.
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.
Compression and Tension Strength of some common Materials
Common materials and average ultimate compression and tension strength.
Drill Bits - Conversion Chart
Convert between drill bit dimensions - gauge numbers, inches and mm.
Hardwood and Softwood Species
Species of hardwood vs. softwood.
Lumber - Surface Finishing
Lumber and surface finishing abbreviations.
Miter Saw - Calculate Sawing Angle
Calculate miter saw protractor angles for skirting and decorative mouldings work.
Modulus of Rigidity
Shear Modulus (Modulus of Rigidity) is the elasticity coefficient for shearing or torsion force.
Softwood Lumber - Grading
Rough lumber, surfaced lumber (dressed), worked lumber, shop and factory lumber and yard lumber.
Structural Lumber - Section Sizes
Basic size, area, moments of inertia and section modulus for timber - metric units.
Structural Lumber - Properties
Properties of structural lumber.
Trusses
Common types of trusses.
Wood - Compressive Strength vs. Moisture Content
Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength.
Wood - Density vs. Moisture Content
The density of wood versus moisture content.
Wood Beams - Strength of Material
Bending and compression strength of wood species used in beams.
Wood Columns - Safe Loads
Safe loads for wood columns.
Wood Hardness
Soft and hardwood - the Janka Hardness scale.
Wood Headers - Max. Supported Weight
Weight supported by a double or triple wood headers.
Wood Screws - Withdrawal Force
Allowable withdrawal load force.
Wood Species - Densities
Densities of various wood species - apple, ash, cedar, elm and more.
Wood, Panel and Structural Timber Products - Mechanical Properties
Density, fibre stress, compressive strength and modulus of elasticity of clear wood, panel and structural timber products.