Sections of a drill which broke through the roof of a rail tunnel came from a construction site above the ground, accident investigators have found.

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To get the set onto the hotel's roof, the producers used a 300-foot construction crane.

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Unibody construction, in which a vehicle's roof, door frames and floor pan are part of a unified, rigid structure, has made vehicles lighter and stiffer.

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Private companies working on everything from the foundation to the roof of buildings are generating double-digit sales growth as the construction sector strengthens, according to data from Sageworks, a financial information company.

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Loud applause and cries of joy erupted from construction workers assembled on a temporary work platform on the roof of the building as the huge, silver spire was gently lowered and secured into place.

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So too are various transport and construction projects: embarrassingly, the elaborate glass and metal roof for the main athletics stadium, designed by Santiago Calatrava, a renowned Spanish architect, may not be ready in time.

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"Hopefully, the roof doesn't come off, " said Mr. Roberts, who works in construction.

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The open site was vulnerable to Sandy's storm surge because it didn't have a roof, said Steve Plate, the Port Authority's director of World Trade Center construction.

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The construction site consists of tidy stacks of flat-packed, prefabricated wall units, roof panels and other jumbo components trucked from Michigan and labeled and numbered like parts for a giant Ikea Akurum cabinet.

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