Diaphragm arch

A diaphragm arch is a transverse wall-bearing arch forming a partial wall dividing a vault or a ceiling into compartments while also bracing the walls.

When used under a wooden roof (with solid spandrels) it has the advantage of providing a partial firebreak. It was first used in Roman Syria, during the 2nd century AD. The diaphragm arch is present in Islamic, Carolingian, Ottonian and Romanesque architecture.

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