Dumbarton Oaks

SGH investigated the condition of seven buildings at Dumbarton Oaks. We completed interior and exterior surveys to identify damage and deterioration, made observations at exploratory openings to document concealed conditions, and performed water testing to determine leakage paths.

Working with the project architect, SGH developed building enclosure repairs for Acorn Cottage, the Director’s Residence, the Main and Guest Houses, Operations Building (OPS), Refectory, and Potting Shed buildings. Highlights of our repair designs included the following:

• Replacing deteriorated felt underlayment and slate roofs to extend the useful life of the roof assembly and protect the invaluable contents
• Testing existing slate to evaluate durability for reusing
• Repairing cracked, loose, and displaced brick to maintain a durable wall
• Replacing Guest House windows, Acorn Cottage doors, and the Main House skylight
• Reframing dormer windows on the OPS building
• Repairing stone panel and balustrade repairs at the Main House

We performed construction administration services, including the following:

• Reviewing building enclosure submittals, shop drawings, and contractor requests for information
• Visiting the site to observe ongoing construction to compare with the design intent and to assist with resolving unforeseen conditions
• Water testing replacement windows to verify performance