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# 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:

Softwood and Hardwood - Structural Strength and Density vs. Classes
Strength ClassCharacteristic 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

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Convert between drill bit dimensions - gauge numbers, inches and mm.

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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

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### 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 Hardness

Soft and hardwood - the Janka Hardness scale.

### Wood Headers - Max. Supported Weight

Weight supported by a double or triple wood headers.

### Wood Species - Densities

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### Wood, Panel and Structural Timber Products - Mechanical Properties

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