The microclimates unbalance of subterrain historic spaces in Italy

One of the primary challenges in conserving a historic site or building in use is determining the optimal threshold for safe and comfortable usage, as well as quantifying and qualifying the risks associated with this usage. To establish a standardised monitoring procedure that effectively collects the necessary information and data, it is crucial to have robust data management procedures focused on capturing essential information for maintenance planning. Additionally, gathering information to support information exchange among key stakeholders involved in the conservation of historical buildings and surfaces, particularly regarding microclimate evaluation and management, is imperative. To achieve these goals, the paper presents microclimatic curves obtained from monitoring buildings in Milan and Sardinia (Cagliari), two regions with distinct geographical and climatic characteristics. The analysis of these curves allows researchers to identify similarities between different locations, similarities within the same location, and the range of days where exterior climate conditions are more stable. This stability enables frequent exchange between the interior and exterior with minimal risk to the conservation of historical materials. These findings are particularly important when a new usage requires the placement, substitution, resetting, or implementation of HVAC systems, including the use of dehumidifiers, to monitor and reduce rising damp [1-2].