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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Shake and Splits, What’s the Difference?

Date Published 11/21/2016

In our previous BLOG,  Shakes Checks and Splits in Dimension Lumber, we discussed the differences between these three types of defects or characteristics found in dimension lumber. All three are commonly thought of as different types of “cracks” or, “splits” in the wood.  Each will have different limits in various grades depending on their effect on Continue reading..

Determining Design Values for Lumber

Date Published 10/25/2016

Recently, we shared a blog discussing the various types of lumber strength properties. These are important for engineers to use to design structure with wood. But where do the lumber design values come from? The process of determining lumber design values has evolved over the years. Originally, people building structures from wood used a trial Continue reading..

Lumber Design Properties

Date Published 09/30/2016

Wood has different strength properties when loaded in different manners. In fact, there are six main design values that are published for lumber and timbers in order for engineers to appropriately design a structure. Bending: Two values are published for bending properties. The fiber stress in bending, Fb, is related to the breaking strength of Continue reading..