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Adriano Faria, Glaucio Dire Feliciano — Artefactum - revista de estudos interdisciplinares · The use of solid waste in improvised barricades embodies an urban contradiction: materials that increase environmental and sanitary hazards may be perceived as resources for protection and territorial ordering. This article critically analyzes this ambivalence and its implications for collective health, perceived safety, and environmental education in vulnerable urban communities, with emphasis on Rio de Janeiro. An integrative review with systematized procedures was conducted. On July 24, 2026, Google Scholar, SciELO, PubMed, and the institutional repositories of the Federal University of Rio de Janeiro, the State University of Rio de Janeiro, and the University of São Paulo were searched using Portuguese and English descriptors related to solid waste, urban vulnerability, favelas, sanitary risk, safety, and barricades. The canonical search record documented approximately 45 potentially