S4s Wood

Overview

Engineering reference data for S4s Wood in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

Lumber Types

S4S lumber refers to wood that has been planed and surfaced on all four sides. This processing results in finished dimensions that are noticeably smaller than the nominal dimensions.

Surfacing Designations

Code	Description
S1S	Surfaced on 1 Side
S2S	Surfaced on 2 Sides
S3S	Surfaced on 3 Sides
S4S	Surfaced on 4 Sides
S1E	Surfaced on 1 Edge
S2E	Surfaced on 2 Edges
S1S1E	Surfaced 1 Side and 1 Edge
S1S2E	Surfaced 1 Side and 2 Edges

Structural Lumber Classification

Yard lumber (structural softwood lumber) is classified by dimensions:

References

• Original Source