Wood, specifically lumber, is generally sized depending on its type, either by its thickness for rough sawn lumber or by specific dimensions for dimensional lumber.
Understanding Wood Sizing Methods
The way wood is sized varies based on whether it is rough sawn or processed into dimensional lumber. This distinction is key to understanding lumber specifications for various projects, from construction to woodworking.
Rough Sawn Lumber Sizing
For rough sawn lumber, the primary method of sizing is according to thickness. This type of lumber is typically cut from the log but not planed or finished to exact, smooth dimensions.
- Key Characteristic: Sized mainly by thickness.
- Appearance: Has a rough surface left by the saw.
- Application: Often used in structural applications where appearance isn't critical, or for applications where the user plans to finish the lumber themselves.
Dimensional Lumber Sizing
Dimensional lumber, on the other hand, undergoes further processing to achieve precise measurements. It is sized in specific widths, thicknesses and/or lengths. This is the type of lumber commonly found in building supply stores for framing and other construction purposes.
- Key Characteristics: Sized in specific widths, thicknesses, and lengths.
- Appearance: Typically planed on all four sides (S4S - Surfaced Four Sides) for a smooth finish.
- Application: Used extensively in residential and commercial construction (e.g., 2x4, 2x6, etc.), furniture making, and DIY projects requiring consistent dimensions.
Comparison of Sizing Methods
Here's a simple comparison based on the sizing information provided:
| Type of Lumber | Primary Sizing Basis | Typical State |
|---|---|---|
| Rough Sawn Lumber | Thickness | Rough, Unplaned |
| Dimensional Lumber | Specific widths, thicknesses and/or lengths | Smooth, Planed |
Understanding these fundamental differences in sizing is crucial when selecting the right type of lumber for a specific application.
