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Softwood Timber Dimensions. Softwood lumber that has a thickness over 5" is called timber. While NIST Publication PS20 indicates that nominal 7" to 15" thick timbers should have 3/4" removed for a finished dimension (e.g. a nominal 8x8 timber has a minimum finished size of 7.25" x 7.25"), most timbers over 7" are finished with 1/2" removed.
Understanding and Identifying Dimensions The typical nominal dimensions for wood, such as 2 x 4, refer to the thickness and the width of the wood.If a third number is added onto the nominal dimensions, such as 2 x 4 x 96, it indicates the length of the wood.
Dimensional lumber is sold using what is referred to as the nominal dimensions of a board. These are the dimensions of the green board before it’s been dried and milled. The actual sizes of a board are smaller than that. The Actual Size of a 2×4. For example, a 2×4 board is actually 1 1/2″ x 3 1/2″. The board is advertised and sold ...
Dimensional lumber has two size categories for width and thickness: nominal size and actual size. Dimensional lumber is wood lumber cut to pre-defined, standard sizes. A two-by-four (2x4) is an example of dimensional lumber. Nominal is the stated name (2x4, for example), and actual refers to the physical dimensions (1-1/2 inches by 3-1/2 inches).
Hardwood Lumber Dimensions: Hardwood lumber is sized based on how many sides are surfaced, or smoothed (to remove saw marks). Hardwoods are rarely sold in standard dimensions, like softwoods, but are sold in board foot or in quarters. Softwood Lumber Dimensions: Softwood lumber is measured in a number of different standard sizes.
Dimensional Lumber Lengths. First of all, you need to know how to read lumber sizes. The first number is always thickness, followed by width. If you see a third number (e.g. 2x4x8), that number is length. Thickness and width are measured in inches, while length is measured in feet. So 2x4x8 is two inches thick by four inches wide, and the board ...
Common Nominal Lumber Sizes and Uses. Nominal lumber sizes come in a range, each suited for specific applications in construction and woodworking. We’ll explore some common sizes and their typical uses: 2×4 (actual: 1.5″ x 3.5″): The workhorse of framing, used for walls, studs, and rafters.
Nominal lumber refers to the size of lumber after it has been rough-sawn, meaning the initial cuts made to divide a log into boards. The surface of these boards are rough and full of splinters and saw marks can usually be seen. Actual lumber refers to the true size of the lumber after it has been seasoned (dried to reduce shrinkage) and planed ...
When calculating nominal and actual lumber dimensions, there is a simple rule you can use to determine the actual dimensions of your lumber vs. nominal lumber sizes: For lumber with a nominal size smaller than 1″, subtract 1/4″. For lumber with a nominal size larger than 2″ but smaller than 8″, subtract 1/2″.
Lumber is bought and sold by the board foot (BF), so calculating BF is key to planning purchases. BF is based on nominal dimensions, not actual thickness and width. BF = (thickness in inches x width in inches x length in feet)/12. For example, an 8′ 2×4 actually measures 1-1/2″ x 3-1/2″. Using the nominal thickness of 2″, width of 4 ...
Updated June 29, 2020. 1x Board Sizes. 1x4 and 1x6 boards lose 1/4 inch in thickness and 1/2 inch in width before leaving the mill. That means a 1 x 4 board is actually 3/4 inches by 3 1/2 inches.
Commercial Standard Lumber Sizes Table Chart. Commercial Lumber Sizes Chart Table. The following data is standard reference and size data for commercially available lumber within the USA. All data is in imperial units (Inches). Mechanical Tolerance Variations of Lumber: Per. Voluntary Product Standard PS 20-05, American Softwood Lumber Standard.
Construction softwood lumber is categorized into three different types based on nominal thickness: Boards: Less than 2” thick. Dimension: At least 2”, but less than 5”, thick. Timber: At least 5” thick. Actual thickness depends on whether the wood was “dressed” (surfaced or smoothed) when it was Dry or Green.
Actual size lumber is the actual measurements of a piece of lumber, not including any thickness or width. Nominal Size Lumber: nominal size lumber is usually 2×4 or 2×6 and has an actual measurement of 3/4 inch by 4 1/2 inches (the height does not include the thickness). Actual Size Lumber: actual size lumber has an actual measurement of 1-1/ ...
This reduces the actual lumber dimensions even further, as well as allowing the producer to be certain that the final product has the dimensions required by industry standards. In the case of a two-by-four, industry standards require the finished board to be 1.5 inches by 3.5 inches).
We recognize such “sizes” as 2x4, 2x6, 4x4, 1x2, etc. This measurement refers to the thickness and width of the lumber, with the length varying. In reality, these measurements are not a true measurement of the lumber thickness or width. The true measurement of a 2x4 is actually about 1.5″ x 3.5″. When the board is first rough sawn from ...
Nominal Lumber Sizes. Nominal lumber sizes are your common names that we all know like 1×2, 2×4, 1×3. The nominal dimensions are the size of the board before it is ran through the planer, squared to size and kiln dried. That is why the actual size is always smaller than the nominal lumber size we have known to call them. Actual Lumber Sizes
The most commonly available dimension lumber sizes are 2×4 through 2×12. The 2×4’s and 2×6’s are ½” less than nominal in width and the 2×8, 2×10’s and 2×12’s are ¾ of an inch less than nominal. This is common knowledge for the experienced lumber user and is the result of the fact that wider lumber shrinks more in width than ...
Green lumber dimensions for thickness and width are closer to the nominal dimensions than the dry lumber dimensions. When a piece of green lumber is surfaced to the “standard” green size, it will shrink to approximately the standard dry size as it dries down to about 15 percent moisture content. (The American Softwood Lumber Standard ...
Dimensional Lumber. 1" rough cut boards are often used for board & batten siding, floor boards, or roof boards. Because 10" and 12" wide boards must be cut from larger logs, they cost more than narrower boards (per board foot). Pine is sometimes preferred for boards due to its nailing ease and inherent soundness in larger log sizes.