The Marseille Unité’s béton brute and sealed-slab type become a model of high thermal mass and isolation from street energy of mixed cities

The 1952 Unité is a heavy concrete ship with brise-soleil, an interior street, and a roof deck — a sealed envelope against the Mediterranean and against the boulevard. He did not write a 2020s energy code. Archival locator: Ville de Marseille — official portal at https://www.marseille.fr/ (opens in a new tab) (Ville de Marseille). Independent locator: Fondation Le Corbusier — English portal at https://www.fondationlecorbusier.fr/en/ (opens in a new tab) (Fondation Le Corbusier).

Context

Not cosmetic twins: different mechanisms. Firminy and Berlin Unités are later copies/neighbours, not extra 1952 Facts. Independent locator: Fondation Le Corbusier — English portal at https://www.fondationlecorbusier.fr/en/ (opens in a new tab) (Fondation Le Corbusier).

That reading is an impact-path choice, not a property stored on the Fact itself.

Why it matters

A concrete housing type as resource-and-climate object is a modest energy path. Medium/low confidence on unique performance; high on 1952 as type date. Later retrofit programmes are not 1952.

Shared responsibility is part of The Marseille Unité’s béton brute and sealed-slab type become a model of high thermal mass and isolation from street energy of mixed cities. Naming Le Corbusier does not delete co-authors, institutions, or later transmitters. The lag from 1952-10-14 to any measured indicator is not treated as zero. Alternative explanations — weather, other armies, later statutes, or independent cultural change — remain live where the sources do not close them.