What is the actual dressed size of a 2 by 8?

The actual dressed size of a board labeled as a "2 by 8" is 1 1/2 inches by 7 1/4 inches. This dimension reflects the standard practice in the lumber industry where nominal sizes are larger than the actual dimensions after the wood is milled, dried, and dressed.

When wood is sawn to its nominal dimensions, it often undergoes a process of drying and planing, which reduces its size. For instance, a "2 by 8" is initially cut to a rough size of approximately 2 inches by 8 inches, but after processing, the dimensions decrease to the dressed size of 1 1/2 inches in thickness and 7 1/4 inches in width. This reduction is a crucial factor for anyone working with lumber to understand, as it impacts the fit and installation of framing, cabinetry, and other construction-related tasks. Consequently, option A accurately reflects the commonly accepted dressed size for a 2 by 8, making it the correct choice.