The work of renowned Baltimore architect George Frederick, the c.1876 Baltimore City Hall is one of the oldest such structures still in continuous use. The team’s work involved an in-depth, hands on stone survey of the entire Beaver Dam marble exterior of this Baltimore City landmark. While the survey did not include hands on survey of other materials, general observations were made for the intricate mansard style slate roofs, gutters, windows, and cast iron dome. From this, our firm developed complete stone restoration documents, which included typical treatments and details, guideline specifications, and a program for the phased restoration of the building’s exterior, including projected budgets. The proposed stone restoration program includes cleaning, repair, and repointing of all exterior marble.
This project included the entry of over 4,000 incidences of stone and mortar deterioration, sorted into sections of the building facade, floor, and bay. A repair was determined for each entry and an associated cost assigned. Once the data was complete, construction documents showing every incidence were completed, creating a comprehensive picture of the building’s current condition and baseline for future surveys. The facade was split into phases and a cost assigned to each phase, projecting over the course of eleven years.