Glazed architectural terra cotta is a

ceramic A ceramic is any of the various hard, brittle, heat-resistant and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcelain ...

masonry Masonry is the building of structures from individual units, which are often laid in and bound together by mortar; the term ''masonry'' can also refer to the units themselves. The common materials of masonry construction are bricks, building ...

building material Building material is material used for construction. Many naturally occurring substances, such as clay, rock (geology), rocks, sand, wood, and even twigs and leaves, have been used to construct buildings. Apart from naturally occurring materia ...

used as a decorative skin. It was popular in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

from the late 19th century until the 1930s, and is still one of the most common building materials found in U.S. urban environments. It is the glazed version of

architectural terracotta Architectural terracotta refers to a fired mixture of clay and water that can be used in a non-structural, semi-structural, or structural capacity on the exterior or interior of a building. Terracotta pottery, as earthenware is called when not us ...

; the material in both its glazed and unglazed versions is sturdy and relatively inexpensive, and can be molded into richly ornamented detail. Glazed terra-cotta played a significant role in

architectural style An architectural style is a set of characteristics and features that make a building or other structure notable or historically identifiable. It is a sub-class of style in the visual arts generally, and most styles in architecture relate closely ...

s such as the Chicago School and

Beaux-Arts architecture Beaux-Arts architecture ( , ) was the academic architectural style taught at the École des Beaux-Arts in Paris, particularly from the 1830s to the end of the 19th century. It drew upon the principles of French neoclassicism, but also incorpora ...

History

Gloucester Road stn former Piccadilly building look north

The material, also known in Great Britain as

faience Faience or faïence (; ) is the general English language term for fine tin-glazed pottery. The invention of a white pottery glaze suitable for painted decoration, by the addition of an oxide of tin to the slip of a lead glaze, was a major ad ...

and sometimes referred to as "architectural ceramics", was closely associated with the work of

Cass Gilbert Cass Gilbert (November 24, 1859 – May 17, 1934) was an American architect. An early proponent of skyscrapers, his works include the Woolworth Building, the United States Supreme Court building, the state capitols of Minnesota, Arkansas and We ...

Louis Sullivan Louis Henry Sullivan (September 3, 1856 – April 14, 1924) was an American architect, and has been called a "father of skyscrapers" and "father of modernism". He was an influential architect of the Chicago School, a mentor to Frank Lloy ...

, and Daniel H. Burnham, among other architects. Buildings incorporating glazed terra-cotta include the

Woolworth Building The Woolworth Building is an early skyscraper, early American skyscraper designed by architect Cass Gilbert located at 233 Broadway (Manhattan), Broadway in the Tribeca neighborhood of Manhattan in New York City. It was the tallest building in ...

New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...

and the

Wrigley Building The Wrigley Building is a skyscraper located at 400–410 North Michigan Avenue on Chicago's Near North Side. It is located on the Magnificent Mile directly across Michigan Avenue from the Tribune Tower. Its two towers in an elaborate style wer ...

Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name ...

. 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. It was created by

Luca della Robbia Luca della Robbia (, also , ; 1399/1400–1482) was an Italian Renaissance sculptor from Florence. Della Robbia is noted for his colorful, Tin-glazed pottery, tin-glazed terracotta statuary, a technique which he invented and passed on to his ne ...

(1400–1482), and was used in most of his works. 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 saving, especially when casts were used in a modular fashion—that is, used repeatedly. It never needed paint, and periodic washings restored its appearance.

Usage

Variations in the color and pattern of the glaze could make it look like

granite Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies undergro ...

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...

; this flexibility helped make it attractive for architects. Four major types of terra-cotta were widely used : # Brownstone was the earliest type. A dark red or brown block which was not necessarily glazed, it was used as imitation sandstone, brick or with real

brownstone Brownstone is a brown Triassic–Jurassic sandstone that was historically a popular building material. The term is also used in the United States and Canada to refer to a townhouse clad in this or any other aesthetically similar material. Type ...

and associated with the architectural styles of

Richard Upjohn Richard Upjohn (22 January 1802 – 16 August 1878) was a British-born American architect who emigrated to the United States and became most famous for his Gothic Revival churches. He was partially responsible for launching the movement to su ...

, James Renwick, Jr., H. H. Richardson. #

Fireproof Fireproofing is rendering something (structures, materials, etc.) resistant to fire, or incombustible; or material for use in making anything fire-proof. It is a passive fire protection measure. "Fireproof" or "fireproofing" can be used as a n ...

was developed as a direct result of the growth of the high rise building in America. Cheap, light and fireproof, the rough-finished hollow blocks were ideally suited to span the I-beam members in floor, wall and ceiling construction. Certain varieties are still in production today. # Veneer was developed during the 1930s and is still used today. Unlike traditional architectural terra-cotta, ceramic veneer is not hollow cast. It is a veneer of glazed ceramic tile which is ribbed on the back like bathroom tile and usually attached to a grid of metal ties which have been anchored to the building. # Glazed architectural terra-cotta was the most complex building material developed. The hollow units were hand cast in molds or carved in clay and heavily glazed, then fired. This is the terra-cotta associated with the architecture of Cass Gilbert, Louis Sullivan and Daniel H. Burnham.

Use in the United States

The American Terra Cotta Corporation, founded in 1881, operated for eighty-five years in the little town of Terra Cotta in the heart of Illinois dairy country (near

Crystal Lake, Illinois Crystal Lake is a city in McHenry County in the U.S. state of Illinois. Named after a lake southwest of the city's downtown, Crystal Lake is 45 miles northwest of Chicago. The population is 40,269 as of the 2020 Census, a 1.2% decrease from 201 ...

). The company fabricated architectural terra cotta for more than 8,000 buildings throughout the U.S. and Canada. It was the last exclusive manufacturer of architectural terra cotta by the time it ceased production in 1966. From its founding, in time to rebuild the fire-ravished city of Chicago, until its closing, it was the major producer of architectural glazed terra cotta in North America.

Guastavino tile The Guastavino tile arch system is a version of Catalan vault introduced to the United States in 1885 by Spanish architect and builder Rafael Guastavino (1842–1908). It was patented in the United States by Guastavino in 1892. Description ...

was used in many places, including the Bridgemarket under the

Manhattan Manhattan (), known regionally as the City, is the most densely populated and geographically smallest of the five boroughs of New York City. The borough is also coextensive with New York County, one of the original counties of the U.S. state ...

side of the

Queensboro Bridge The Queensboro Bridge, officially named the Ed Koch Queensboro Bridge, is a cantilever bridge over the East River in New York City. Completed in 1909, it connects the neighborhood of Long Island City in the borough of Queens with the Upper East ...

. ;Illinois examples Image:Albert Hecht1.jpg, 6715-6725 S. Paxton Ave., c. 1925, Chicago, IL Image:Albert Hecht2.jpg, 2301-2347 E. 70th Pl., c. 1925, Chicago, IL Image:Albert Hecht3.jpg, 7247-51 S. Phillips Ave., c. 1925, Chicago, IL Image:Albert Hecht4.jpg, 7936 S. Luella Ave., c. 1925, Chicago, IL Image:Three Sisters Fixed.jpg, 13042 S. Western Ave., The Woolworth Building, for Teresa Klein, 1915, Blue Island, IL Image:Georgian 1.jpg, 422 Davis St., Evanston, IL. 1926, Main entrance, the Georgian Hotel Image:Georgian 2.jpg, 422 Davis St., Evanston, IL. 1926, Corner detail, the Georgian Hotel Image:Georgian 3.jpg, 422 Davis St., Evanston, IL. 1926, Cornice detail, the Georgian Hotel

Use in Canada

Although glazed terra-cotta was much more common in the US, it was used in central

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

starting around 1900, on many of the area's first skyscrapers. The glazed terra-cotta used in central Canada was usually imported from the US or England.

Use in Great Britain

Leeds University Great Hall Staircase March 2017 01

From around 1880 unglazed terra-cotta was supplanted by the glazed version - faience, and glazed brick - which were easily cleaned, and not blackened by city smoke, notably by the

Burmantofts Pottery Burmantofts Pottery was the common trading name of a manufacturer of ceramic pipes and construction materials, named after the Burmantofts district of Leeds, England. Company history The business began in 1859 when fire clay was discovered in a ...

company which also exported to

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...

and

Montreal Montreal ( ; officially Montréal, ) is the List of the largest municipalities in Canada by population, second-most populous city in Canada and List of towns in Quebec, most populous city in the Provinces and territories of Canada, Canadian ...

.''Pevsner Architectural Guides'' - Leeds, Susan Wrathwell, 2005,

Use in Australia

Faience was popularised in

Melbourne Melbourne ( ; Boonwurrung/Woiwurrung: ''Narrm'' or ''Naarm'') is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in both Australia and Oceania. Its name generally refers to a met ...

in the 1920s by architects such as

Harry Norris Harry Norris (12 June 1888 – 15 December 1966) was an Australian architect, one of the more prolific and successful in Melbourne in the interwar period, best known for his 1930s Art Deco commercial work in the Melbourne CBD. His designs were ...

. One of the leading commercial architects of the time in the city, Norris was strongly influenced by trends in American architecture and used faience on projects such as the Nicholas Building and the Kellow Falkiner Showrooms (a 1928 car showroom) in

South Yarra South Yarra is an inner-city suburb in Melbourne, Victoria, Australia, 4 km south-east of Melbourne's Central Business District, located within the Cities of Melbourne and Stonnington local government areas. South Yarra recorded a popul ...

. In

Sydney Sydney ( ) is the capital city of the state of New South Wales, and the most populous city in both Australia and Oceania. Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about towards the Blue Mountain ...

, it featured on notable buildings such as BMA House, designed by Joseph Charles Fowell. Australian-made tiles were available from Wunderlich Tiles, a company founded by London-born Frederick Wunderlich.

References

External links and sources

National Park Service.gov: The Preservation of Historic Glazed Architectural Terra-Cotta

(January 2002 article)

— project architect's website.
Harvard Graduate School of Design.edu: Ceramics Research

Randalls Urban Sculptures
— photos of architectural terra cotta and gargoyles from demolished buildings. Terracotta Architectural elements Building materials Ceramic art Ceramic glazes Ornaments (architecture) Tiling Wallcoverings