SGH investigated leakage at the Annex copper roofs that damaged decorative plaster finishes and historic murals. We concluded the copper roofing and underlayment could not accommodate expansion, which lead to leakage. SGH designed temporary roofing to stop chronic leakage and then designed repairs and provided construction administration services for a comprehensive roof replacement and repairs to interior finishes, including decorative finishes. We developed repairs that extended the useful life of the structure and were also commensurate with the historic composition of the building. Our rehabilitation program included the following work, which was reviewed by the Massachusetts Historical Commission:
Repairing the Annex roofs and skylights, wing terrace roofs, and the Bulfinch portico roof
Restoring gold leaf cladding
Replacing the skylight
Removing and reinstalling the historic balustrade on the Bulfinch portico
SGH completed a structural assessment of the roof framing to determine its ability to resist snow loads if snow fences and guards were added. We also designed repairs for damaged roof framing and decking attachments, added a fall-arrest system, and designed structural support of a new cooling tower.
We also helped the Commonwealth assess options to provide photovoltaic panels on the historic building and incorporated integrated photovoltaic panels into the new skylight systems.