What is a Flying Buttress?

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What's a flying buttress?

Flying buttress
Flying buttress (Rouen, 1200s AD)

In the 1100s AD, architects in northern France wanted to build big impressive Gothic cathedrals, and they wanted their cathedrals to be full of light, so they would be inspiring, not dark and depressing. But if the walls were mostly glass windows, how would they hold up the heavy stone roof?

Somebody (nobody knows who) invented the flying buttress. Instead of the buttress being stuck to the side of the building, it would form an arch leading away from the building.

The flying buttress would start from the places at the top of the wall where the groin vaults were directing the weight of the roof. From there, the flying buttresses would carry the weight of the roof away from the building and down a column of stone to the ground. It wouldn't matter what the walls were made of anymore, because they wouldn't be carrying the weight of the roof.

Flying buttresses rouen
More flying buttresses (Rouen 1200s AD)

Once architects began to use flying buttresses in their churches, they began to make more and more of the wall out of glass, and cathedrals looked lighter and more heavenly. They used flying buttresses at Notre Dame and the Sainte Chapelle in Paris, at Chartres, at Rouen, Reims, and Amiens cathedrals. Architects also used flying buttresses in England, at Westminster Abbey. The flying buttress did not catch on so much in Italy, where people liked their cathedrals to have a lot of stone and not so much glass.

Bibliography and further reading:

Arches to Zigzags: An Architecture ABC, by Michael J. Crosbie (2000). Shows what an arch is, or a gable, or an eave. For younger kids.

Eyewitness: Building, by Philip Wilkinson, Dave King, and Geoff Dann (2000). Lavishly illustrated, like other Eyewitness books for kids, and with good explanations of most architectural terms.

City: A Story of Roman Planning and Construction, by David Macaulay (1983).

More about buttresses
What's a groin vault?
What's a nave?
What's a transept?
What's a basilica?
What's a cathedral?
Romanesque architecture
Gothic architecture
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Copyright 2012-2015 Karen Carr, Portland State University. This page last updated September 2015.

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