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New York

Silverstein is building 3 WTC concrete-first

Iron workers union formerly resisted unusual “composite” design

3 World Trade Center under construction (credit: WTC Progress / Facebook) and a rendering of the building
3 World Trade Center under construction (credit: WTC Progress / Facebook) and a rendering of the building

At 3 World Trade Center, Silverstein Properties is employing an uncommon construction method once shunned by union workers.

The developer is building the 80-story office tower using a “composite” structural design: a concrete core and a steel perimeter.

The technique was long resisted by Local 40 of the International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers, who balked at the idea of working below a concrete pouring team.

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The novel approach means the building’s topping out will be marked with a bucket of concrete signed by workers, rather than the traditional topmost steel beam, the New York Times reported.

But the terrorist attacks of Sept. 11, 2001 demonstrated the vulnerability of skyscrapers built with steel-framed cores.

The core of 2.8 million-square-foot Rogers Stick Harbour & Partners-designed tower is three feet thick on average, and reinforced with steel bars.

The building is set to open in 2018. Advertising firm GroupM has agreed to lease about 690,000 square feet there. [NYT] – Ariel Stulberg