![]() Calculating board feet can be a little tricky, but it’s essentially just a measurement of the volume of the board.Ī board foot is equal to 144 cubic inches, or a board that measures 12″ long by 12″ wide by 1″ thick. Hardwood lumber such as oak, maple, or walnut is sold very differently from dimensional lumber and is usually measured by the board foot. Learn more about the actual thickness of plywood. Plywood is thinner than the nominal thickness as well, but for a different reason. Modern sawmills typically account for this, however, and will mill the dried boards to a more exact size, making dimensional lumber generally consistent. Today, boards are intentionally cut large to allow for shrinkage during kiln drying and the milling process.īecause the amount a board shrinks can vary by wood species, moisture content, and even the individual tree, the final size may vary slightly. Historically, softwood logs were cut green into 2″ x 4″ planks but would naturally shrink as the boards dried out, and after planing and milling, they ended up around 1-1/2″ x 3-1/2″. Why is dimensional lumber smaller than the nominal dimensions? If the nominal size is 8″ or larger, then the actual size of the board will be 3/4″ smaller. ![]()
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