Polonnaruwa Quadrangle Thuparama Image House: corbelled brick vaulted dome and thick masonry?
What medieval brick corbelling techniques allowed 12th-century builders to roof the massive image house at Thuparama without timber ceiling supports?
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4 Answers from travellers
The Thuparama Image House in the sacred Quadrangle of Polonnaruwa is the only ancient shrine in the city whose masonry vaulted roof remains completely intact. Built in the 12th century, the structure features massive exterior brick walls over 2.5 meters thick. To span the central sanctuary chamber without combustible wooden ceiling timbers, builders employed true brick corbelling and barrel-vaulted arches: successive horizontal courses of kiln-fired bricks were stepped inward progressively until meeting in a closed apex dome, distributing roof weight downward into exterior walls.
Thick masonry walls provided exceptional thermal mass, keeping the interior sanctuary cool and protecting stucco Buddha statues from monsoonal dampness.
The exterior facade displays arched window niches (gavaksha) housing seated terracotta and stucco deity figures.
Flash photography is prohibited inside the dim interior sanctum; low lighting preserves ancient stucco plaster details.
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