Visually Graded Lumber vs. Machine Graded Lumber

Visually Graded Lumber vs. Machine Graded Lumber

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 […]

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Shake and Splits, What’s the Difference?

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 […]

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determining-design-values

Determining Design Values for Lumber

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.

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Lumber Design Properties

Lumber Design Properties

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 […]

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What-is-Wood-Grain

What is Wood Grain – Part 2

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 […]

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BEHIND-THE-MARK---PART-2---THE-SPIB-LABORATORY

Behind the Mark – Part 2 – The SPIB Laboratory

The SPIB Laboratory During last month’s Blog, we looked at the Treated Wood Field Inspection Process…so what happens next? As we learned previously, core samples are taken by the SPIB Inspector as part of the routine audit process of a given treating plant and the number of charges to be sampled is based on the […]

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What-is-Wood-Grain

What is Wood Grain

Wood grain is the longitudinal arrangement of wood fibers [1] or the pattern resulting from this.[2] R. Bruce Hoadley wrote that grain is a “…confusingly versatile term…” including the direction of the wood cells (straight grain, spiral grain), surface appearance or figure, growth-ring placement (vertical grain), plane of the cut (end grain, quarter sawn, flat […]

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How to Grade Displaceable Knots

How to Grade Displaceable Knots

Grading Knots Away From the Edge Learning to grade edge knots and combination knots in dimension lumber takes a fair amount of study and practice. These type knots most often limit the grade of a piece. Once the grader has a complete understanding of how these knots are measured and limited it becomes a matter […]

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