The goal of this study was to find the optimum lamina size from red pine (Pinus densiflora) and Japanese cedar (Cryptomeria japonica) logs for the cross laminated timber (CLT) production. From visual inspection of the logs from two species, red pine log showed a larger knot and warp compared to the Japanese cedar. Different cross-sectional sizes of lamina (110 mm × 30 mm, 110 mm × 40 mm, 110 mm × 50 mm, 50 mm × 30 mm, 30 mm × 30 mm) from two species were analyzed for yield and grade. Regardless of the species, the optimized cross sectional size for maximizing the yield was 110 mm × 30mm. In grading for the different size laminas from Japanese cedar and red pine, a higher percentage of the first and second grade was found from the 110 mm × 30 mm lamina cut.