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This paper introduces and valorises pierre-simili and cimorne cladding by confronting knowledge resulting from literature, patents and lab analysis. This leads to original formulas and application methods, which will be further investigated towards scientific renovation and restoration strategies. Early 20 th century architecture is characterized by the development of innovative finishes like pierre-simili and cimorne cladding. Pierre-simili finish or ‘stone imitation’ is used in order to imitate sandstone masonry facades. The illusion of stone is obtained by adding lime, mica and crunched stone to a light grey or white cement (bad mortar) and by scraping the surface to create a rough texture. Consequently false joints are drawn into the wet mortar. Cimorne (ciment orne) means ‘decorated cement’. Opal glass fragments are projected into wet mortar. This technique allows applying a bright coloured mortar that does not fade. Currently, there is no scientific based strategy to solve present damage such as contamination, cracks and peeling off. The combination of a literature study, a study of records, patents and onsite research followed by laboratory analysis of onsite lifted samples leads to formulas and application methods that will contribute to future renovation/restoration projects.

Pierre-similiandcimornécladding: from modern craftsmanship to contemporary renovation techniques