opus testaceum

Opus testaceum refers to Roman construction using bricks or tiles laid in mortar, a technique that became widespread during the imperial era. This method was more cost-effective than stone construction due to mass production and less specialized labor requirements.123

Roman construction primarily utilized masonry or concrete. While early structures used stone like tuff and travertine, brick became the dominant facing material for concrete walls. Triangular tiles were often used, appearing as thin bricks, with larger tiles called bipedales employed at intervals for bonding. This brick-faced concrete, known as opus testaceum, was a common wall-facing material throughout the empire. It eventually replaced earlier facing techniques like opus reticulatum (diagonal checkerboard pattern) and opus incertum (irregular stones).451