In 1881 Guastavino came to New York City from
Valencia, with his youngest son, nine-year-old Rafael Jr. This property currently is owned by Christmount Assembly, the conference center for the
Christian Church (Disciples of Christ). Guastavino's wife Francesca remained in the house until she died in 1946, and all that remains is a brick foundation and a
wine cellar. The property holds artifacts that may be visited, including the kiln and chimney, a wine cellar, beautiful old stone walls, and many smaller structures that have been rediscovered as modern buildings have been constructed there. in Philadelphia Guastavino and his son also developed twenty-four products that were awarded patents. Their company, Guastavino Fireproof Construction Company, The largest dome created by the Guastavino Company was over the central
crossing for the
Cathedral of St. John the Divine in
Manhattan: it is in diameter and 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. 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 make progress. At the edges, many layers of tile were laid, and the dome thins as it rises toward the center. ==As building engineer==