The aim of this study is the evaluation of mechanical behaviour of T-joints made in wood and reinforced with bidirectional long glass fiber and epoxy matrix, using numerical and experimental methods of investigation. Joints in composite / wood are not uniform and different interfaces are present in them, each of which responds differently over time when requested. These composites are also anisotropics and many important mechanical quantities, such as stiffness, vary independently of each other. Due to the characteristic heterogeneity of constituent materials, the diversity of the thickness [1,2,3], the characteristic loading mode, the study of these composites is very complex to be analyzed. The difficulty in developing analytical models able to interpret and to predict their behaviour over time, is complicated by the different phenomena interacting with each other. Obtaining coherent results from numerical-experimental methods of investigation, therefore, means having an ideal instrument to study and monitor the evolution of damage [4,5]. In this work, a numerical FEM model of a simple T-joint has been developed in order to evaluate stress field in the critical point. Finally, experimental static tests are carried out on the same kind of joints.