The structural behavior of a wood-framed wall diaphragm is to a large extent dependent on the 3-dimensional behavior of the whole building. In this connection the influence of transverse walls is an issue of special interest. A plastic design method capable of analyzing the behavior and capacity of partially anchored wood-framed wall diaphragms has been presented in earlier papers. In this paper, the plastic model is applied to the case where a wall diaphragm is connected to a transverse wall. The paper describes the theoretical analysis and the experimental results for sheathed wood-framed transverse walls of different geometrical configurations and with different boundary conditions. Transverse walls are studied by varying the number of sheet segments and the horizontal fixing of the top rail. The effect of the tying-down action of transverse walls on the vertical uplift is studied and the horizontal load-carrying capacity of wall diaphragms is analyzed.