The technology of wood applications has a significant role in many engineering constructions. Wood is an adaptable material with good proportion of strenght to weight ratio and has wide use in applications of engineering constructions [Winandy J.E., Encyclopedia of Agricultural Science. Orlando, FL: Academic Press: Vol. 4, 549–561, October 1994]. It is a construction material for rafters, struts and other parts of the buildings [2]. It is important to increase the strength of beams with big length or strengthen struts in old buildings. The strengthening can be achieved adhering wood in his upper and lower surface with composite material (sandwich beams with core from wood) or only in his lower surface. Typically, two strong and stiff skins that carry most of the in-plane and bending loads are adhesively bonded to wood 3, 4, 5, 6.