On the influence of narrative in the perception of raw earth construction
Résumé
Raw earth has fundamental environmental values, including low embodied energy, reduced greenhouse emissions, and
endless reuse. These benefits are driving the growing interest in earth-based construction projects and research (Morel
and Charef, 2019).
Moreover, raw earth as a material has numerous technical advantages, which can contribute to the quality of life of
people living in and using raw earth buildings. To date, its hygrothermal advantages are probably those which have been
most widely investigated (McGregor et al., 2016). However, raw earth has other strong points, less well known, which
can also contribute to quality of life in a building, and which deserve more detailed attention. Such is the case regarding
acoustic performance. A good acoustic comfort and quality is frequently attributed to earth architectures, but these
assertions are usually not supported by facts nor data (Degrave-Lemeurs, Glé and Hellouin de Menibus, 2018).
Nevertheless, its contribution is not limited to the physical field. The sensory domain in the questioning and design of
lived space is also essential for placing people at the heart of the process (Audas, 2008). In order to treat the issues
connected with both physical and sense-related factors, this study will take an approach based on architectural
ambiances (Dubois, 2012), and more specifically, sound ambiances.
Studying raw earth's role in a specific environment, that of primary schools, allows a rich and complimentary analysis
of both physical and perceptual factors. This choice of environment enables physical factors determining raw earth's
potential impact on architectural acoustics to be studied in a place where successful sound ambiance management is of
fundamental importance to quality of use. Regarding research into perceptual factors, the school environment allows
access to a wide range of users: adults and children of different ages and different socio-cultural profiles.
The current work being carried out has highlighted the possible influence of construction history on the ambiances
perceived by the future users of a building and it is this evidence that we want to share here. In contrast to conventional
building sites using conventional materials, earth construction sites can offer greater involvement and participation for
future users, non-professionals, and the general public. In countries such as France, it is common to use this possibility
to organize workshops or training sessions for professionals or volunteers, supervised by earthen craftsmen in order to
lower the expenses of building and to create a synergy of exchange and a diffusion of knowledge (BRUDED, 2019).
Consequently and as a result of the observations made on the study sites, when users are given the opportunity to
become active participants in the construction of buildings which will become their homes or workplaces, their
perceptions of the ambiances of those buildings are likely to be influenced by their experiences of the construction
process. Other factors, such as knowing the particular narrative of the building’s construction or the use of ecological
materials including raw earth, can also influence the end user’s perception. However, in the case of raw earth a
controversy arises, as its ancient character often gives it an archaic and negative image that is not always out-weighed
by its benefits as an ecological material.
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