Lumber - 12 x Drawings & Dimensions

12 by lumber is a type of lumber that is 12 inches wide and has a variety of thicknesses including 12x12, 12x14, 12x16, and 12x18. It is typically used for floor joists, beams, and columns. 12 by lumber is made from a variety of wood species, including pine, fir, and spruce.

12英寸板材，又名12英寸宽板材，其厚度多样，包括12x12、12x14、12x16和12x18等规格。此类板材常用于楼板桁架、梁柱结构。12英寸板材可由多种树种制成，如松木、冷杉和云杉等。