A voussoir ( UK: ; US: ) is a wedge-shaped element, typically a stone, which is used in building an

arch An arch is a curved vertical structure spanning an open space underneath it. Arches may support the load above them, or they may perform a purely decorative role. As a decorative element, the arch dates back to the 4th millennium BC, but stru ...

or vault.“Voussoir, N., Pronunciation.” Oxford English Dictionary, Oxford UP, June 2024, https://doi.org/10.1093/OED/7553486115. Accessed 24 Mar. 2025. Although each unit in an arch or vault is a voussoir, two units are of distinct functional importance: the keystone and the

springer Springer or springers may refer to: Publishers * Springer Science+Business Media, aka Springer International Publishing, a worldwide publishing group founded in 1842 in Germany formerly known as Springer-Verlag. ** Springer Nature, a multinationa ...

. The keystone is the centre stone or masonry unit at the apex of an arch. The springer is the lowest voussoir on each side, located where the curve of the arch springs from the vertical support or

abutment An abutment is the substructure at the ends of a bridge span or dam supporting its superstructure. Single-span bridges have abutments at each end that provide vertical and lateral support for the span, as well as acting as retaining walls ...

of the wall or

pier A pier is a raised structure that rises above a body of water and usually juts out from its shore, typically supported by piling, piles or column, pillars, and provides above-water access to offshore areas. Frequent pier uses include fishing, b ...

. The keystone is often decorated or enlarged. An enlarged and sometimes slightly dropped keystone is often found in

Mannerist Mannerism is a style in European art that emerged in the later years of the Italian High Renaissance around 1520, spreading by about 1530 and lasting until about the end of the 16th century in Italy, when the Baroque style largely replaced it ...

arches of the 16th century, beginning with the works of Giulio Romano, who also began the fashion for using voussoirs above rectangular openings, rather than a lintel (Palazzo Stati Maccarani, Rome, circa 1522). Each wedge-shaped voussoir ''turns aside'' the thrust of the mass above, transferring it from stone to stone to the springer's bottom face ( impost), which is horizontal and passes the thrust on to the

buttresses A buttress is an architectural structure built against or projecting from a wall which serves to support or reinforce the wall. Buttresses are fairly common on more ancient (typically Gothic) buildings, as a means of providing support to act a ...

, piers or

abutments An abutment is the Bridge#Structure types, substructure at the ends of a bridge Span (architecture), span or dam supporting its Bridge#Structure types, superstructure. Single-span bridges have abutments at each end that provide vertical and l ...

. Voussoir arches distribute weight efficiently, and take maximum advantage of the

compressive strength In mechanics, compressive strength (or compression strength) is the capacity of a material or Structural system, structure to withstand Structural load, loads tending to reduce size (Compression (physics), compression). It is opposed to ''tensil ...

of stone, as in an

arch bridge An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its structural load, loads partially into a horizontal thrust restrained by the abutments at either si ...

. The outer boundary of a voussoir forms an extrados, internal - an intrados (soffit). In

Visigothic The Visigoths (; ) were a Germanic people united under the rule of a king and living within the Roman Empire during late antiquity. The Visigoths first appeared in the Balkans, as a Roman-allied barbarian military group united under the comman ...

and

Moorish The term Moor is an exonym used in European languages to designate the Muslim populations of North Africa (the Maghreb) and the Iberian Peninsula (particularly al-Andalus) during the Middle Ages. Moors are not a single, distinct or self-defi ...

architectural traditions, the voussoirs are often in alternating colours ('' ablaq''), usually red and white. This is also found sometimes in

Romanesque architecture Romanesque architecture is an architectural style of medieval Europe that was predominant in the 11th and 12th centuries. The style eventually developed into the Gothic style with the shape of the arches providing a simple distinction: the Ro ...

Etymology

The word is a

stonemason Stonemasonry or stonecraft is the creation of buildings, structures, and sculpture using stone as the primary material. Stonemasonry is the craft of shaping and arranging stones, often together with mortar and even the ancient lime mortar ...

's term borrowed in

Middle English Middle English (abbreviated to ME) is a form of the English language that was spoken after the Norman Conquest of 1066, until the late 15th century. The English language underwent distinct variations and developments following the Old English pe ...

from French verbs connoting a "turn" ('' OED'').

References

External links

Photo repertory of voussoirs
— at www.OntarioArchitecture.com {{Islamic architecture, state=collapsed Arches and vaults Masonry Ornaments (architecture) Architectural elements Architectural history Moorish architecture Islamic architectural elements

Etymology

See also

References

External links