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Opus spicatum

Opus spicatum, literally "spiked work," is a type of masonry construction used in Roman and medieval times. It consists of bricks, tiles or cut stone laid in a herringbone pattern.

Uses

Its usage was generally decorative and most commonly it served as a pavement, though it was also used as an infill pattern in walls, as in the striking base of the causeway leading up to the gate tower at Tamworth Castle. Unless the elements run horizontally and vertically, it is inherently weak, since the oblique angles of the elements tend to spread the pattern horizontally under compression.

The type of construction was constantly employed in Roman, Byzantine and Romanesque work, and in the latter was regarded as a test of very early date. It is frequently found in the Byzantine walls in Asia Minor, and in Byzantine churches was employed decoratively to give variety to the wall surface. Sometimes the diagonal courses are reversed one above the other.^[1]

The herringbone pattern produces opposing shear plane faces, increasing the relative surface area and therefore rendering it a sounder design for mortar and brick.

Firebacks

Herringbone work, particularly in stone, is also used to make firebacks in stone hearths. Acidic flue gases tend to corrode lime mortar, so a finely set herringbone could remain intact with a minimum of mortar used. Usk Castle has several fine examples.

Examples

The herringbone method was used by Filippo Brunelleschi in constructing the dome of the Cathedral of Florence (Santa Maria del Fiore).^[2]

Examples in France exist in the churches at Querqueville in Normandy and St Christophe at Suèvres, both dating from the 10th century, and in England herring-bone masonry is found in the walls of castles, such as at Guildford, Colchester and Tamworth,^[1] as well as Usk Castle in Wales.

Herringbone brickwork was also a feature of Gothic Revival architecture.^{[citation needed]}

References

^ ^a ^b One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Herring-bone". Encyclopædia Britannica. Vol. 13 (11th ed.). Cambridge University Press. p. 391.
^ Mueller, Tom (February 10, 2014). "Mystery of Florence's Cathedral Dome May Be Solved". National Geographic Society. Archived from the original on February 14, 2014. Retrieved 31 December 2014.

Opus caementicium roman walls

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