In plywood industries, the transverse hygrothermal deformation of wood has an important role in log end checks extension. In this survey, the transverse deformation /of wood and log end checks of hornbeam have been studied. Twenty seven hornbeam (Carpinus betulus) trees in three diameter classes were cut down at “ Kheyroodkenar Forest” in Nowshahr. From each tree, one log and two disks from ends, were cut. By a specified method, the elastic and hygrothermal deformation of disks were measured. Furthermore, all log end checks were measured before and after heat treatment and data were statistically analyzed. The results shows that hygrothermal deformation does not follow any specific pattern and varies among diametric classes of hornbeam logs. Among the diametric classes, there were little changes in the longest check relative factor and log waste percent. As the heat treatment temperature increases the mean checks length, the longest check relative factor and log waste percent increases due to the increased hygrothermal and total deformations.
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