Risk Evaluation Methodology for Weather-Related Degradation of Building façades

Weather action is a relevant cause of fa & ccedil;ade degradation. Specific research evidence concerning its impact on the durability of building materials still needs to be comprehensively investigated and fully evaluated. This paper outlines a risk evaluation methodology for weather-related degradation of building fa & ccedil;ades. Two phases are considered: (1) laboratory work focussing on generic weather simulation in the wind tunnel in order to establish the hygric and thermo-aerodynamic vulnerabilities of constructions and to evaluate possible protective measures; (2) analysis of meteorological data and mapping of actual and projected hazards. Methods include the simulation and validation of wind-driven rain with gravimetric assessment of rainwater penetration into material specimens, the characterisation of the thermal behaviour of fa & ccedil;ades and that of the interaction between wind and building, using pressure measurements and flow visualization. The results enable decision-makers and professionals to evaluate the risk of weather-related degradation, individuating those areas of the construction more prone to damage, and thus to plan for adequate protection strategies. This would optimise the allocation of resources and increase the overall resilience of building structures. Future work is suggested with the intent of further validating the methodology both experimentally and with real-life applications.