Validation of an inspection and diagnosis system for anomalies in natural stone cladding (NSC)

Based on a proposal for a classification system for anomalies and their probable causes in natural stone cladding (NSC) an inspection plan was developed for recent buildings with anomalies in this type of cladding, to validate the system. This field work generated data from 59 buildings whose cladding exhibited various anomalies, in a grand total of 288. A specific area of Lisbon city (Portugal) was selected for most of the inspections: The Parque das Nações – an urban area that was regenerated for the Expo’98 World’s Fair. Based on these inspections, a comparative analysis was performed on various surfaces clad in this material, i.e. pavements versus walls and indoor versus outdoor applications. The resulting data underwent a statistical analysis and post-treatment, providing conclusions that could lead to actions to prevent degradation of this type of cladding and its substrate, with the aim of achieving a better quality and less costly built environment.

► Innovative inspection and diagnosis system of natural stone cladding. ► Validation of the system through a large scale sample of building façades. ► Application to a recent urban area known for its target high quality of living. ► Important lessons for the design, execution and maintenance of natural stone cladding.