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A diaphragm arch is a transverse wall-bearing arch forming a partial wall dividing a vault or a ceiling into compartments [1] while also bracing the walls. [2]
When used under a wooden roof (with solid spandrels) it has the advantage of providing a partial firebreak. [3] It was first used in Roman Syria, during the 2nd century AD. [4] The diaphragm arch is present in Islamic, Carolingian, Ottonian and Romanesque architecture. [2]