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A primary drawback of barrel vaulting innovation in Romanesque architecture is that it inhibits light and circulation.
What is barrel vaulting?
A barrel vault, also known as a tunnel vault, waggon vault, or waggoned head vault, is an architectural element formed by the extrusion of a single curve (or, in the case of a pointed barrel vault, a pair of curves) along a given distance. The curves are usually circular in shape, giving the overall design a semi-cylindrical appearance. The barrel vault is the most basic type of vault, consisting essentially of a series of arches placed side by side (i.e., one after another). It is a barrel roof.
Since the barrel vault exerts thrust as the arch does, it must be buttressed along its entire length by heavy walls in which openings must be limited in size and number. This is a disadvantage, since it inhibits light and circulation.
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