Multianalytical approach to diagnosis and conservation of building materials: the case of Punta Troia Castle in Marettimo (Aegadian Islands—Sicily, Italy)

The paper presents the results of a multianalytical study carried out through laboratory investigations on building materials of “Punta Troia Castle” in Marettimo Island (Sicily). The main aims of the work were to characterize the petrographic nature and to determine the geological provenance of the stone materials used to build the castle as well as to define the causes and mechanisms at the origin of their decay, in order to support and ensure greater durability to the restoration interventions. Based on the collected data, the local dolomitic limestone may be stated as the main stone for reconstruction purposes. In fact, this building stone shows low porosity, high compactness and a very good durability with respect to any other lithotypes identified in the building structure of the castle.