History
The material, also known in Great Britain as faience and sometimes referred to as "architectural ceramics", was closely associated with the work of Cass Gilbert, Louis Sullivan, and Daniel H. Burnham, among other architects. Buildings incorporating glazed terra-cotta include the Woolworth Building in New York City and the Wrigley Building in Chicago.
Glazed architectural terra-cotta offered a modular, varied and relatively inexpensive approach to wall and floor construction. It was particularly adaptable to vigorous and rich ornamental detailing. Terra-cotta is an enriched molded clay brick or block. It was usually hollow cast in blocks which were open in the back, with internal stiffeners called webbing. Webbing substantially strengthened the hollow blocks with minimal weight increase. The blocks were finished with a glaze, with a clay wash or an aqueous solution of metal salts, before firing. Late 19th century advertising for the material promoted the durable, impervious and adaptable nature of glazed architectural terra-cotta. It could accommodate subtle nuances of modeling, texture and color. Compared to stone, it was easier to handle, quickly set and lower cost. The cost of producing the blocks, when compared to carving stone, was a considerable savings, especially when casts were used in a modular fashion—that is, used repeatedly. It never needed paint, and periodic washings restored its appearance.
Read more about this topic: Glazed Architectural Terra-cotta
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