Interest in utilization of hardwoods for glued structural timber products like glued laminated timber and cross-laminated timber is increasing due to external factors such as shifting availability of softwoods and hardwoods and rising demand for timber in the building sector and favourable mechanical properties of hardwoods. In an orienting study, 83 beech boards sawn from 17 logs and 109 ash boards originating from 14 logs were examined. Dynamic measurement of modulus of elasticity for the logs as well as for the boards at different processing stages was performed, and the boards were visually strength-graded according to DIN 4074-5 (2008) and tested in tension according to EN 408 (2012). With regard to pre-grading of logs by dynamic measurement, the results seem promising for both tested hardwood species, with good correlations between log and board stiffness observed. In contrast, the relationship between tensile strength and static modulus of elasticity in tension was found to be lower compared to spruce. For the beech
sample it was still moderately strong, but for the ash boards only a weak correlation was observed. The frequent occurrence of pith strongly affected the result of visual grading and the pith might even have more adverse influence on the yield of high-strength boards than the knottiness. The application of internal log scanning for sawing optimization might be a key to an efficient production of structural boards from hardwoods.