This refers to lumber that is nominally 1.25 inches thick. The designation, often pronounced “five-quarter,” indicates its rough-sawn dimension before drying and surfacing. After processing, the actual thickness is typically closer to 1 inch. As an example, a board labeled as such would be used where a slightly thicker material is required compared to standard one-inch stock, offering increased strength and stability.
Its significance lies in providing a balance between the structural integrity of thicker lumber and the ease of use associated with thinner stock. It finds frequent application in furniture making, cabinetry, and trim work where the extra thickness contributes to a more substantial feel and improved durability. Historically, this dimension arose from the need for materials that could withstand greater stress and wear in various applications.
