What does the abbreviation of S2S stamp on a piece of lumber mean?

The abbreviation S2S on a piece of lumber stands for "Surfaced Two Sides." This designation indicates that the lumber has been planed and finished on both of its flat faces, resulting in a smoother and more refined appearance. This process enhances the lumber's aesthetic appeal and makes it easier to work with, especially for applications where a finished look is desired.

While "Smooth," "Shaped," and "Sand" may seem related to surface treatment, they each imply a different process or finish. "Smooth" suggests a finished texture but does not specifically indicate the surfacing process and could lead to ambiguity. Similarly, "Shaped" might refer to a different method of altering the lumber's profile, while "Sand" implies a finishing step that might occur after surfacing but does not encompass the initial planing and smoothing. Therefore, the correct terminology used in industry standards is "Surfaced Two Sides," reflecting both the process and the final result.