Dimensional Lumber
Definition and meaning of Dimensional Lumber in real estate.
Dimensional lumber is wood that has been cut and planed to standardized width and depth measurements, such as two-by-fours or two-by-sixes.
In more detail
This lumber is the primary building material used in wood-frame construction for residential homes in the United States. It is important to note that the nominal size of the wood, which is its name before planing, is larger than its actual dimensions. For example, a standard two-by-four has an actual size of one and a half inches by three and a half inches.
Standardizing these sizes allows builders to design and construct homes efficiently because framing members, insulation, and drywall are manufactured to match these exact measurements.
Key facts
| Category | Property Types & Construction |
|---|---|
| Nominal vs actual | Actual dimensions are smaller than the nominal name |
| Common sizes | Two-by-four, two-by-six, and two-by-eight |
| Primary application | Wood-frame building construction and structural framing |
A carpenter purchases standard dimensional lumber from a local home improvement store to frame the interior walls of a basement remodel.
Frequently asked questions
Why is the actual size of dimensional lumber smaller than the nominal size?
The nominal size is the dimensions of the rough log before it is dried and planed smooth at the lumber mill, which removes wood and reduces the size.
What wood species are used for dimensional lumber?
In the United States, softwoods like Douglas fir, pine, spruce, and hemlock are most commonly harvested for framing lumber due to their strength and abundance.
How is dimensional lumber graded?
Lumber is inspected and stamped with a grade based on its strength and appearance, with higher grades used for load-bearing structures.