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Copper roofing in rural atmospheres corrodes at rates of less than 0.4 mm (1 ⁄ 64 in) in 200 years. [27] Unlike most other metals, copper does not suffer from underside corrosion that can cause premature failures in roofing. With a copper roof, supporting substrates and structures usually fail long before the copper on the roof. [11]
The Romans used copper as roof covering for the Pantheon in 27 BCE. [3] Centuries later, copper and its alloys were integral in European medieval architecture. The copper roof of St. Mary's Cathedral, Hildesheim, installed in 1280 CE, survived until its destruction during bombings in World War II. [4]
A $60-million, two-year restoration started in early 2014 included removing paint, priming and quickly repainting. Steel pins and "metal stitching" were used to repair cracks, and water damage inside was fixed. [4] Scaffolding was erected around the dome in November 2014.
The Pantheon's roof was originally covered with gilt bronze tiles, but these were removed in 663 by Emperor Constans II and replaced with lead roofing. [28] [59] The function of the Pantheon remains an open question.
The Pantheon in Rome.Largest dome in the world for more than 1,300 years. Oculus of the Pantheon. This is a list of Roman domes.The Romans were the first builders in the history of architecture to realize the potential of domes for the creation of large and well-defined interior spaces. [1]
The Pantheon in Rome, built in the 2nd century, was the largest dome in the world for over a millennium, and is still the largest unreinforced solid concrete dome. The dome of Florence Cathedral was the largest in the world from its construction in 1436 to 1871, and is the largest brick and mortar dome.
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