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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Shakes, Checks and Splits in Dimension Lumber

Date Published 04/15/2015

What is the difference between a shake, a check and a split? They are similar in that they all are separations lengthwise in the grain of the wood; however, each has a different origin and a different effect on the grade of dimension lumber. First, let’s look at the definition of each. Shakes Shakes are Continue reading..

Learning to Grade Softwood Dimension Lumber

Date Published 04/08/2015

What is Dimension Lumber? We have all seen buildings being framed with lumber. Do you know what type and grades of lumber are used in this framing process? Sometimes referred to as “dimensional lumber” or “framing lumber”, this wood is the mainstay of the housing industry in the US and Canada. Dimension lumber, as this Continue reading..

Total Measurement: Understanding Knots in Dimension Lumber

Date Published 04/01/2015

Have you ever wondered why you observe some large and at times unsightly decayed knots on the surface of your framing lumber? How can this lumber be graded correctly, especially in No.2 or higher grades? If you do not understand how and why knots in Dimension Lumber are limited, then these knots that appear unacceptable Continue reading..