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Rafael Guastavino Moreno (Valencia, Spain, 1842 – Asheville, North Carolina 1908) was a Spanish architect and builder. Based on the catalan vault he created the Guastavino tile, a "Tile Arch System" patented in the United States in 1885 used for constructing robust, self-supporting arches and architectural vaults using interlocking terracotta tiles and layers of mortar. Guastavino tile is found in some of New York's most prominent Beaux-Arts landmarks and in major buildings across the United States. It is used in a huge number of architecturally important and famous buildings with vaulted spaces. Guastavino was not the principal architect for most of the projects.
Guastavino Fireproof Construction Company
In 1881 he came to New York City from Barcelona, with his youngest son, nine-year-old Rafael III. In Spain he had been an accomplished architect trained in Barcelona and was a contemporary of Antoni Gaudi. In the United States his first major commission, of McKim, Mead, and White's Boston Public Library (1889), made him known to every major architect on the East Coast. His published drawings of interior decoration of the Spanish Renaissance style caught the eye of an architect, who asked him to submit a design for the planned New York Progress Club building. After forming a partnership with William Blodgett, he eventually was offered a construction position in 1890 with George W. Vanderbilt to construct arches for the new mansion, Biltmore at Asheville, North Carolina.
After working on the estate, he decided to build his own retirement home in the mountains of Black Mountain, North Carolina in a 500 acre valley. His house, Rhododendron, had a vineyard, dairy, brick kiln, and more. This property currently is owned by Christmount Assembly, the conference center for the Christian Church (Disciples of Christ). On the property there still are artifacts that may be visited, including the kiln and chimney, a wine celler, beautiful old stone walls, and many smaller artifacts that have been rediscovered as modern buildings have been constructed.
He and his son developed twenty-four items that were awarded patents. Their company, Guastavino Fireproof Construction Company, run by the father then by his son, was incorporated in 1889 and executed its final contract in 1962.
Akoustolith was one of several trade names used by Guastavino.
In 1900, New York architects Heins & LaFarge hired Guastavino to help construct City Hall station, the underground showpiece for the IRT, the first part of the then-new New York City subway. The station, although elegant, was never convenient or popular, and after it closed in 1945 it became a legendary abandoned Manhattan underground relic, the secret of subway buffs and urban spelunkers. Guastavino also installed the ceiling of the south arcade of the Manhattan Municipal Building, which was constructed during 1907-1914.
Literally hundreds of other major building projects incorporate the distinctive Tile Arch System. In Chicago, the central nave vaulting of Rockefeller Chapel at the University of Chicago uses 100,000 Guastavino tiles. In Boston Guastavino tiles are to be found in the Boston Public Library; in New York, in Grand Central Terminal, Grant's Tomb, Carnegie Hall, the American Museum of Natural History, Congregation Emanu-El of New York, and St. Bartolomew's Episcopal Church on Park Avenue; and in Washington, D.C. in the U.S. Supreme Court building and the National Museum of Natural History on the National Mall. Guastavino tiles form the domes of St. Francis de Sales Roman Catholic Church (Philadelphia), and in Union Station (Pittsburgh), the vaulting of the carriage turnaround is a Guastavino tile system. In Nebraska the tiles may be seen in the Nebraska State Capitol.
Having experienced Ellis Island as an incoming immigrant, in 1917 the younger Guastavino was commissioned to rebuild the ceiling of the Ellis Island Great Hall. The Guastavinos set 28,832 tiles into a self-supporting interlocking 56-foot (17 m)-high ceiling grid so durable and strong that during the restoration project of the 1980s, as many sources repeat the story, only seventeen of those tiles needed replacing.
The largest dome created by the Guastavino Company was over the central crossing for the Cathedral of Saint John the Divine in Manhattan: it is 100 ft (30 m) in diameter and 160 feet (49 m) high. This dome was intended to be a temporary structure, to be replaced by a high central tower. In 2009 this "temporary" fix celebrated the 100th anniversary of its construction. In large part, Guastavino received this contract due to the much lower price he could quote because his system served as its own scaffolding. This was an extreme test of his system, however. The masons had to work from above, each day adding a few rows of tiles, and standing on the previous day's work to progress. At the edges, many layers of tile were laid, and the dome thins as it rises toward the center.
Few structures designed and built by Guastavino alone have been identified. He was responsible for a series of rowhouses with unusual Moresque features on West Seventy-eighth Street (121-131 known as the "red and whites"), in Manhattan's Upper West Side, which survive. "Guastavino's is one of New York City's premiere event spaces, located under the 59th st bridge in midtown Manhattan. It was designed by and named after the renowned Catalan architect, Rafael Guastavino." His son Rafael's Mediterranean villa (1912) built entirely of Guastavino tiles, still stands on Awixa Avenue, Bay Shore, Long Island.
Retirement in North Carolina
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After working on a commission at the Biltmore Estate, Guastavino retired to Black Mountain. The site of his estate is now Christmount, the conference and retreat center of the Christian Church (Disciples of Christ). Ruins of the Guastavino Estate still stand, as well as a collection of Guastavino memorabilia in the Christmount library. In North Carolina his work is found in Duke Chapel in Durham, the Jefferson Standard Building in Greensboro, the Motley Memorial in Chapel Hill, and St. Mary's Catholic Church in Wilmington. He is buried in the crypt of the Basilica of St. Lawrence, Asheville, which he designed in 1905.
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The records and drawings of the Guastavino Fireproof Construction Company are held by the Department of Drawings & Archives in the Avery Architectural and Fine Arts Library at Columbia University in New York City. 
- Sam Allis (February 26, 2011). "The greatest architect you've never heard of". The Boston Globe. Retrieved February 26, 2011.
- Christmount, conference and retreat center of the Christian Church (Disciples of Christ)
- Guastavino Facebook page, retrieved 2010-11-21
- Penataquit Point History
- Ochsendorf, John; Freeman, Michael (Photographer), Guastavino Vaulting: The Art of Structural Tile, Princeton Architectural Press; 1st edition (September 22, 2010). ISBN 978-1568987415
- Rafaelguastavino.com: documenting Guastavino's work in New York City
- Guastavino "event space" in Manhattan
- Guastavino.net: documenting Guastavino's work in the Boston area, this page provides copies of writings and patents by the Guastavinos as well
- "Rafael Guastavino, architect and builder"
- Video of masons using traditional Guastavino methods, ca.2012
- Palaces for the People: Guastavino and America’s Great Public Spaces, travelling exhibition starting at Boston Public Library (September 28, 2012–February 24, 2013) then in Washington DC (until January 20, 2014); "Palaces for the People" - direct link to on-line exhibit.