Dimensional lumber is standardized, sawn wood used in construction framing, defined by nominal sizes such as 2×4 or 2×6.

Dimensional lumber refers to wood products that are sawn and manufactured to standardized nominal sizes for use in construction framing and general building applications. Common examples include sizes such as 2×4, 2×6, and 4×4, which are widely used for structural and non-structural purposes.

In construction, dimensional lumber is primarily used for framing walls, floors, roofs, and other structural assemblies. It is typically produced from softwood species such as spruce, pine, or fir and may be kiln-dried or pressure-treated depending on exposure conditions. While nominal sizes are used for identification, the actual finished dimensions are slightly smaller due to milling and drying processes.

From a performance and compliance perspective, dimensional lumber must meet grading standards that define strength, moisture content, and allowable defects. Proper selection, spacing, and installation are essential to ensure structural integrity, code compliance, and long-term durability in residential and light commercial construction.

A standard 2×4 hasn’t actually measured 2 inches by 4 inches for decades—today it typically measures about 1½ inches by 3½ inches.

• Kiln-Dried Lumber
• Laminated Veneer Lumber (LVL)
• Quarter-Sawn Lumber