National September 11 Memorial & Museum

The space between where the Twin Towers once stood in New York City was transformed into a museum.  Two footprints subtracted into the earth, filled by waterfalls surround each pool's perimeter. The Museum was erected between these pools of falling water. The Memorial opened on September 11, 2012, and the Museum opened May 15, 2014.

The Museum design was originated by Snøhetta,  acclaimed Norwegian architectural team. Architects worked with our Design Assist, a dedicated ‘think tank’ where the project's facade was translated into a constructible scheme.  Zahner unitized the metal systems in Kansas City and then shipped everything to the job site for installation.

The architects worked with Zahner engineers and designers in the Design Assist team to develop the facade system.

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Developing the 911 Museum Metal Facade

The panels were tested for wind loads and water permeability at a special facility. The panelization method used for the project required welding studs to the reverse of each panel. Fabricators weld with the engineered settings so that the studs don't show on the face of the panels.

The surface of the metal shell alternates between GB-60 polish and a No. 4 polish on stainless steel. The No. 4 polish has greater reflectivity along a linear grain, while the GB-60 surface scatters light for a more diffused look. This alternation repeats itself as a motif in not only the stainless steel facade, but also across the fenestration surface.

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Zahner's NS11 mockups were tested for high moisture and winds.
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Zahner fabricator installs studs on the backs of NS11 Panels.
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Zahner's NS11 mockups were tested for high moisture and winds.
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National September 11 Museum during construction
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Detail of the National September 11 Museum stainless steel surface