Stone buildings are important representations of the history of the country and should be preserved for future generations. One of the major concerns with these structures is the out-of-plane strength of the walls under earthquake loads. Many of these buildings, notably churches, include buttresses which were originally included to improve the out-of-plane strength of the walls. Current Codes and Standards in Canada do not provide guidance for engineers to assess the out-of-plane strength of walls with buttresses. An Applied Element Method(AEM) software was then used to recreate existing experimental data on the out-of-plane and in plane strength of stone masonry walls, and the model was modiﬁed to analyze the behaviour of buttresses. The results from the modelling programme are related back to historic and modern analysis methods obtained from a thorough literature review.