North Extension Pediment Sculpture

U.S. Capitol, Washington, DC

During the exterior stone restoration campaign of the US Capitol Building, North (Senate) Extension, we performed conservation repairs to the east facing pediment sculpture group, Progress of Civilization. This work occurred from 2016-2017.

Like the South Extension pediment, the Capitol’s North Extension pediment is enriched by the major program of sculpture that speaks to the history, development, and values that underlie this country. The sculpture group was carved in Lee, Massachusetts marble by Thomas Crawford in 1854 and installed in 1863. It depicts a variety of figures germane to the onward march of democracy.

Prior to any work beginning on the sculpture group, EverGreene’s conservation team performed a condition assessment in 2016. The assessment helped develop a scope of work that included cleaning, stain removal, removal and replacement of bird deterrent system, removal and replacement of joint mortars and sealants, and conservation repairs. The conservation repairs, which were performed by EverGreene, included laser cleaning, consolidation, crack injection grouting, application of a shelter coat, stabilization of fragile elements, and rebuilding and replacement of lost features.