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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SPIB eLearning Go to Courses

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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SPIB Resource Monitoring Program

Date Published 03/23/2017

In the early 1990’s, new lumber design values were approved for all major softwood lumber species in North America. This testing program was known as the “In-Grade Testing Program” because each piece of lumber tested was required to be precisely of the grade being tested. The design values were based on tests of full-size pieces Continue reading..

Proper Planer Alignment Reduces Manufacturing Imperfections

Date Published 02/24/2017

With the arrival of grade scanners in many southern pine production lines, there is a growing need to be much more precise with the planer machine work to plane a defect-free piece of lumber.  Machine defects that the naked eye will miss on the production line, the scanners easily pick up and if only a Continue reading..

Visually Graded Lumber vs. Machine Graded Lumber

Date Published 01/13/2017

There are different ways of determining the grade of dimension lumber. Historically, “visual” grading is performed where a person looks at all four sides of a piece of lumber and evaluates the characteristics present to determine which of several visual grades the piece belongs. This grader works on a grading chain and quickly evaluates each Continue reading..