Southern Pine Inspection Bureau


Since 1915, SPIB has provided grading rules, training, production surveys, and other services to ensure product integrity and build a sustainable future for the industry.

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The SPIB mark represents quality assurance and reflects our commitment to lead the industry in exacting standards, thorough training, and innovative application of advanced technologies to ensure the integrity of softwood lumber products.

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The Solution for Lumber Grader Training

SPIB eLearningIf you want to learn to grade dimension lumber, or if you just want to become more knowledgeable of the grading rules, the defects and characteristics of lumber, the terminology and theory of dimension lumber grading then this course is for you.

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Lumber Grade-Marking History: 1919

Date Published 03/06/2019

1919 was another year that left an incredible mark on the globe, and particularly on the United States. In July, the United States Army sent a convoy across the continental U.S. to see whether or not it would be possible to cross all of North America by road. This particular effort took many months to complete and was woefully inefficient, but because of it, the U.S. Highway System would be born.


Lumber Grade-Marking History: 1918

Date Published 02/07/2019

Even though we don't necessarily think about these early years of the 20th century as critical to human history today, all it takes is one cursory glance at some of the things that happened during 1918 to see that if anything, that may just be a bit of an understatement.


Lumber Grade-Marking History: 1917

Date Published 01/08/2019

1917 was a year of many firsts. Jeannette Rankin officially became the first female member of the United States House of Representatives in March of that year, right around the time that Woodrow Wilson was sworn in for his second term as president. The Republic of China would later terminate all diplomatic relations with Germany, something that would act as the starting point for a lot of the conflict born in the coming decades.