The study of the state of the art has shown the lack of methodological references and best practices when it is necessary to carry out an intervention to improve the energetic behavior of historic stone masonries. This lack refers above all to the values of transmittance and thermal resistance of the walls. Therefore, this paper aims to illustrate an experimental methodology aimed at identifying the most probable value of transmittance of historical masonries using the UNI ISO 9869:1994 standard. It is based on preliminary surveys and subsequent in situ measurements, in accordance with the conditions and procedures set by the aforementioned standard. The methodology illustrated was applied to a case study located in Italy, in the hinterland of the Abruzzo region. The study showed how the transmittance value measured in situ was considerably lower than the corresponding data provided by the literature. Once the actual trasmittance data were obtained, a three-dimensional modeling of the building aggregate under study was carried and winter heating/summer cooling requirements were calculated. The study presented in this paper is part of a broader research aimed at investigating the energetic characteristics of historic walls in the particular context of the Province of L'Aquila, Italy.
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