The earthen architecture widely spread in many countries of Europe, America, Asia, Africa, testifies to a particular material and immaterial culture. Nevertheless, it is a fragile heritage, which needs continuous maintenance. To encourage the preservation of such evidence of building techniques, an experimental campaign aimed at the development and evaluation of the performances of protective earthen plasters was undertaken. The durability of the plasters was improved through the addition of different additives, some of them traditional (such as lime and gypsum) and others innovative (geopolymers, enzymes), and resulting from industrial wastes (cement kiln dust). These additives have been selected considering low production costs and a reduced environmental impact, to improve the sustainability of the interventions. The performances of the earthen plasters in terms of efficacy (resistance to water erosion, water absorption, drilling, thermo-hygrometric cycles) and compatibility (changes in color and water vapor permeability) have been evaluated. Good performances were obtained by the different mixtures and, in particular, by those stabilized with gypsum. The results of this experimentation could find a useful application in the preservation of both ancient and new earthen built heritage.

In recent decades, there has been a growing awareness of the importance and desirability of fostering the involvement of more actors, and in particular local communities, in the protection of cultural heritage. Since universities have long been asked to become promoters of actions aimed at increasing society’s general level of well-being through interventions with cultural, social, and educational implications via technology transfer and knowledge sharing, a mutual collaboration between different researchers of the Politecnico di Torino, public administrations, and local communities has been consolidated over the last few years to provide a proactive contribution to both the preservation of cultural heritage and the social and economic development of the territories. A new educational methodology with direct and mutual collaboration between teachers and students, local communities, and policymakers was tested. The experiences conducted so far testify to the university’s ability to fulfil its training, research, and “Third Mission” tasks, both by responding to the needs of the territory and by transmitting up-to-date work methodologies, disciplinary skills, attention to context, and dialogue with local communities. The work carried out, appreciated by citizens and municipal administration representatives, was able to provide hints and stimuli for new opportunities and actions to be undertaken, foreshadowing possible development trajectories of the contexts investigated.

Earthen architecture, by its nature, is a fragile because it has a poor resistance toward the action of weathering, which has also increased in recent years through the effects of climate change. The presence of interesting examples of earthen brick buildings, for example, in the Piedmont Region of Italy, is characterised by the absence of rendering, which reveals the need to test treatments for the protection and/or strengthening of the walls of these buildings. This action is of fundamental importance to improve its resistance to the aggressive action of atmospheric agents and avoid their disappearance. A testing campaign adopting protective products with sustainability characteristics and low environmental impact was carried out on earthen brick walls. Different products belonging to various categories (synthetic polymers, natural resins, nano-structured materials) and selected based on previous experiments or tested for the first time on earthen surfaces were selected. The performance assessment of the products was carried out by taking into account the standardised procedures in the field of cultural heritage conservation through the following tests: water absorption, water vapour permeability, drilling resistance, water erosion tests (Geelong and spray), contact angle measurements, colorimetric measurements, and ageing tests. Although the choice of the optimal protective product should be made on a case-by-case basis, where it is not sustainable to proceed in this way, the results of this experimental campaign—in the presence of materials and weathering conditions similar to those of the case study analysed—will provide indications in identifying of the most appropriate product.

This article compares the management plans of three UNESCO World Heritage cities—Lyon (France), Djenné (Mali), and Yazd (Iran)—to assess local community engagement in heritage conservation. The study explores cultural, social, and economic factors shaping participatory approaches, examining the roles of institutions, civil society, residents, and property owners. Management Plans and their implementation are analysed, which show how local initiatives are received and sustained over time. The comparison of the three cities reveals trends in community involvement, showing how spontaneous actions contribute to heritage durability, accountability and long-term preservation. Urban landscape preservation efforts further assess how proposed measures translate into practice and their impact across different contexts, examining how heritage awareness spreads differently in each city and emphasizing the importance of local engagement in achieving effective and sustainable conservation strategies.

Piedmont is characterized by the presence of numerous earthen buildings mainly concentrated in the province of Alessandria. Studies conducted over the last decade, however, have shown the presence of interesting examples of these buildings also in the provinces of Asti, Torino, Biella and Cuneo. They are generally two-storied rural constructions, built with both fired bricks (for the bearing structures) and adobe (for internal and external walls).

This paper investigates the building techniques and related materials of some earthen constructions in Tirana and Kavaje in the framework of a scientific collaboration project between Italy and Albania. This architectural heritage is at significant risk of disappearing for many common reasons: the perception of poverty and unhealthy conditions it generates in most citizens, building speculation whereby earthen buildings are considered an obstacle to urban development, and a lack of specific laws to protect it. Furthermore, following the many earthquakes that hit Albania, the last one in 2019, the damaged earthen dwellings were replaced with fired bricks and reinforced concrete constructions. Several unprotected buildings in Kavaje and Tirana were thus studied to collect data and materials that could represent the last existing documentation. This manuscript analyses data relating to construction techniques, mineralogical and granulometric characterisation of the earthen materials constituting the bricks and mortars, and decay phenomena of the built heritage.