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Industry Terms and Definitions

Below you can find a glossary of terms related to the lumber and timber industry to help you better understand SPTP’s products and services and how they can benefit your organization. 

Niche product

A product that is manufactured and marketed for specialized uses; niche products are readily differentiated from other products

Nominal size

The size designation for most lumber, plywood and other panel products, used for convenience; in lumber, the nominal size usually is greater than the actual dimension; thus, a kiln dried 2 x 4 ordinarily is surfaced to 1.5 to 3.5 inches; in panel products, the size is generally stated in square feet for the surface dimension in increments of 1/ 8 inch for thickness


A reference to the specific gravity of wood' lumber classified as "non–dense" has five or fewer annual rings per inch, and/or less than 1/3 summerwood, measured at either end

Novelty siding

Siding with a lower edge intended to be decorative