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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All Pine Trees Aren’t the Same: It May be One of Several Species

Date Published 02/16/2018

The term,” yellow pine”, can refer to several pine species or groups of species which tend to grow in similar forest types and yield similar strong wood. In the Western US, yellow pine refers to Jeffrey pine or Ponderosa pine. In the United Kingdom, yellow pine refers to Eastern white pine or Scots pine. In Continue reading..

Your Rules Writing Agency for Southern Pine

Date Published 09/20/2017

How was SPIB formed? The Southern Pine Association was formed in 1915 to provide a common set of grading standards for the industry. Prior to the formation of the SPA, each regional pine association published their own grading rules using different grades and sizes. With the advent of World War I, the Department of Commerce Continue reading..

Density of Wood

Date Published 06/05/2017

What is density of lumber? In a general sense, density is defined as mass per unit of volume. For lumber, that could be given in units of pounds per cubic foot, or expressed as specific gravity (or relative density) where the density of the lumber is divided by the density of water (also in pounds Continue reading..