The cellar’s west wall, a critical structural component for the Mansion, has been largely inaccessible since the installation of HVAC ductwork in 1998. With the removal of that ductwork, as part of the Mansion Revitalization Project, Mount Vernon’s Preservation team was able to assess the wall’s condition.
Moisture infiltration, in the form of rain or groundwater, has been an issue in the Mansion cellar since Washington’s time. Washington designed a system of underfloor drains to manage moisture from rain and groundwater that worked well into the modern era until necessary structural reinforcements to the Mansion’s framing in the late 19th and early 20th century obstructed portions of the system. Over many years, moisture and humidity in the cellar have damaged some original materials, particularly soft Aquia sandstone blocks used in the original foundations.
For this reason, the Preservation team was eager to evaluate the condition of the west wall, some of which is comprised of original Aquia sandstone. During their assessment, the team identified surviving 18th-century materials, as well as areas that had undergone previous repairs or replacements. By thoroughly documenting the wall’s condition, the Preservation team can create a comprehensive restoration plan for this critical support element. Restoration efforts will begin on the west wall following the installation of external shoring.
