What is lumber grading?

Lumber grading involves evaluating wood’s quality based on criteria like strength, appearance, and other characteristics to assign a specific grade. Each grade corresponds to particular uses and applications, so grades must be correct to ensure the lumber is suitable for its intended use. For instance, structural lumber must meet stringent strength criteria for load-bearing purposes. In the U.S., six associations including the Western Wood Products Association (WWPA), Southern Pine Inspection Bureau (SPIB), Northeastern Lumber Manufacturers Association (NELMA), and National Lumber Grades Authority (NLGA) are responsible for setting and managing lumber grades.

Why is precise lumber grading and marking so important?

Proper grading is vital to ensure lumber is fit for its intended purpose. For example, if a piece of lumber is incorrectly graded, a builder may use it for the wrong application, leading to structural failure and potentially dangerous consequences. Building codes mandate that all lumber used for structural applications bear the stamp of an approved grading or inspection agency. Building inspectors typically won’t approve structures built with ungraded lumber or with missing grade marks as they won’t know the load-bearing capacities of joists and rafters, for example. Furthermore, accurate lumber grading upholds your business’s reputation by providing suitable products for clients, building your brand with clear logos, and facilitating successful building inspections. Provide clear and precise lumber grading, and your customers (and bottom line) will thank you.

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