Design of wall diaphragms has been a topic of major discussions during the development of the European timber design code, Eurocode 5. The main problem has been that wall diaphragms are fastened to the substrate in different ways in different countries and that this fact must be reflected in the code. A plastic method for design of wood frame wall diaphragms is presented which can be used in case of partially or fully anchored studs and fully anchored bottom rail. In this paper the method is applied to walls that are more than one storey high. The principles of the method are demonstrated for walls with and without openings. The possibility of using transverse walls for anchoring with respect to vertical uplift is illustated