Composite timber-masonry walls have been used in many old traditional and preservable buildings that constitute a significant part of the world cultural heritage. In this structural system the walls are composed by a timber substructure that is filled by masonry with (or without) mortar. The response of these walls to any static or dynamic loading, even of small intensity, is generally non-linear, mainly due to the complex interaction between the timber and masonry components. It is obvious that the analysis, design, strengthening and retrofitting of these composite structures demand a quite complex, reliable and effective structural model that can take into consideration all the above mentioned construction details and sources of non-linear behaviour. In the present study such a precise analytical micromodel for this structural system is further developed and demonstrated with application examples.