3 by 2 timber refers to a standard size of lumber commonly used in construction. The name "3 by 2" is derived from its nominal dimensions in inches, though it's typically sold with slightly smaller finished dimensions in millimeters.
Understanding Nominal vs. Finished Size
It's important to understand the difference between nominal and finished sizes when working with timber.
- Nominal Size: This is the stated size of the timber before it is planed. The nominal size of 3x2 timber is 47mm x 75mm.
- Finished Size: This is the actual size of the timber after it has been planed and smoothed. The finished size of 3x2 timber is typically 45mm x 70mm.
3x2 Timber: Imperial vs. Metric Measurements
As noted in the reference, timber sizing is complicated by the use of both imperial (inches) and metric (millimeters) measurements. The name "3 by 2" is an imperial reference, but the actual dimensions are usually given in millimeters. The common sizes are:
| Measurement | Nominal Size | Finished Size |
|---|---|---|
| Metric (mm) | 47mm x 75mm | 45mm x 70mm |
Uses of 3x2 Timber
3x2 timber is a versatile size suitable for a variety of projects, including:
- Stud walls in internal constructions
- Timber framing
- Roof batons
- General carpentry projects
Key Takeaways
- 3x2 timber is a standard size of lumber.
- The "3 by 2" designation is an imperial reference, but timber is commonly sold with metric measurements.
- The nominal size (before planing) is 47mm x 75mm
- The finished size (after planing) is typically 45mm x 70mm
