![]() ![]() 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?
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