Question

How did flying buttresses change cathedrals?

Answer 1

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Anglo-Norman cathedrals of the 11th and 12th centuries needed very thick and robust external walls to support both the heavy roof timbers and the internal vaulting of Norman arches. For this reason, window apertures had to be small and the height of the walls was fairly limited. 

The advent of flying buttresses took the downward and outward stresses away from these walls and instead fed the weight into these buttresses - meaning that the walls could be made much thinner, much taller and with much larger window apertures. This was the birth of the huge stained-glass windows seen in many of the Gothic (or Perpendicular) style cathedrals around Europe. 


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