Diaphragm arch

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]

Diaphragm arch, South East Tower, Beaumaris Castle

Diaphragm arches in Romanesque architecture (St Philibert, Tournus)

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]

See also

• Islamic architecture
• Romanesque architecture
• Kucheh