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.

Make things easier by using our product locator

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.

Use our product locator as a tool to find the quality products you are looking for at the nearest place to you.

Email Sign Up

Want to keep in touch?

Stay up to date with SPIB training classes and more by signing up to our email list.

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.

Our Blog See More →

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..

Behind The Mark – A Look At The SPIB Treated Wood Inspection Process

Date Published 08/05/2016

SPIB Treated Wood Quality Mark OK, we’ve covered a ton of information in our first two Treated Wood Inspection blogs! Essentially, the plant inspection has been completed…records were reviewed, in-plant QC was assessed, product was evaluated for penetration and retention analyses have all been completed and uploaded into the plant’s database. What happens now? As Continue reading..

What is Wood Grain – Part 2

Date Published 07/18/2016

In our first Blog, “What is Wood Grain’’, (May 12, 2016), we learned that one way the term “wood grain” can be used is to describe the density of the wood as it relates to structural properties of dimension lumber.  We learned that the closer together the annual rings are, and the higher the percentage Continue reading..