New video details work keeping the gasholder from collapsing

  • A worker atop the gasholder roof in a photo taken by drone. September 2022 Bill Graham / Iron Works Images

  • A portion of the interior of Concord's historic gasholder. Fall 2022. NH Preservation Alliance

  • Members of Steeplejack Co. atop 20 metal I-beams that meet in the center of the building acting as “spoke beams” holding shoring towers that support the roof. The I-beams are needed because the floor of the gasholder is the relatively flimsy top of the metal cap that once floated atop the stored gas. September 2022 NH Preservation Alliance

Published: 11/27/2022 11:00:29 AM
Modified: 11/27/2022 11:00:13 AM

Keeping the historic gasholder building from collapsing involved building a central steel platform resting on a center brick column and 16 massive shoring towers holding up the roof’s main rafters.

That is among the details available in a new video posted by the New Hampshire Preservation Alliance about efforts to save the building. The work, which wrapped up last month, is designed to stabilize the roof and the building while money is raised and plans are made for a  long-term solution.

The video is on YouTube at, titled “Gasholder Emergency Stabilization: Part 3 of a series.”

The building, 88 feet in diameter and almost 30 feet high, was built in 1888 to hold “manufactured gas” made from coal that was used for lights and heating downtown. That job ended after natural gas came to Concord via pipeline in 1952 and the building has been mostly empty since.

It is owned by Liberty Utilties, which has no use for it or the surrounding two acres.

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