Philadelphia, Pennsylvania

The front stone stair at Cliveden of the National Trust was experiencing accelerated deterioration. The steps are original to the c. 1760 building and an important part of the building's overall interpretation since they were reputedly damaged by cannonball fire during the Battle of Germantown in the Revolutionary War. BCA recently performed a series of in-situ investigations and laboratory analyses to identify the source of the stone's damage and develop an appropriate conservation treatment. BCA also performed the treatment, which included cleaning and consolidation of the stone.