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.

Opus spicatum paving in Trajan's Market, Rome.
Wall in opus spicatum.

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.

Firebacks
Fireplace at Usk Castle

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

Examples

The herringbone method was used by Filippo Brunelleschi in constructing the dome of the Cathedral of Florence (Santa Maria del Fiore).[1]

Herringbone brickwork was also a feature of Gothic Revival architecture.

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See also
  • Roman concrete, also known as Opus caementicium – Building material used in construction during the late Roman Republic and Empire
  • Roman architecture

References
  1. Mueller, Tom (February 10, 2014). "Mystery of Florence's Cathedral Dome May Be Solved". National Geographic Society. Retrieved 31 December 2014.

Opus caementicium roman walls

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