Historical masonry heritage in Italy has been endangered on several occasions by earthquakes. In particular, churches, due to their typical large hall conformation, have proven to be more vulnerable to seismic events than other architectural typologies. However, while numerous studies have been published on the collapse mechanisms of this typology, there is still much to be learned about the effects that interventions carried out following recent seismic events could have in case of future earthquakes. This research aims to analyze the strengthening interventions realized on churches after the 1996 earthquake in the Emilia area (in the North of Italy), in order to verify their real performance considering the damage suffered during the 2012 earthquake, also thanks to the design of a proactive GIS (Geographic Information System) database. In particular, this paper examines the effectiveness of tie-rod systems to prevent the overturning of the facade and steel reinforced cement rendering for the consolidation of the vaults, taking into account the construction technologies and methods used.