Cathedral of the Immaculate Conception
Renovations, Repair, & Restoration, Investigation & Inspection, Historic Preservation
Constructed between 1848 and 1892, the Cathedral is a National Historic Landmark and the second Roman Catholic Cathedral built in New York State.
Ryan Biggs | Clark Davis provided structural engineering services for the exterior masonry restoration, interior renovations, and reconstruction of the stairs.
The Cathedral’s existing vertically bedded brownstone had extensively delaminated and failed, primarily from freeze-thaw cycles. The exterior restoration included replacement of the brownstone for 60 percent of the building including the 190-foot-high north tower. At the time, it was considered the largest brownstone restoration in the Western Hemisphere.
Our scope included in-situ testing of proposed stone anchors; analysis of the structure under construction loading; design of scaffolding support; and design of the north tower steeple reinforcing and hold-down, post-tensioned cables. The interior renovation included reconfiguration of the altar, restoration of the neo-gothic plaster, and structural improvements of the floors. All of this work was coordinated around a crypt located beneath the Cathedral, which houses the coffins of six former Bishops.