Working with the project architect, SGH reviewed their proposed design for replacing the copper roofs over the four main wings, the main dome, and the lantern dome.
SGH provided recommendations to improve constructability and performance. Our recommendations addressed the following:
Detailing the attachment of new roofing to existing substrates and evaluating substrate conditions to accommodate underlayment at the decorative roof and dome roof profiles
Clarifying copper jointing and attachment requirements to aid pricing and construction efforts
Detailing expansion joints to accommodate thermal movement of roofing and flashing
Clarifying the scope of work for replacing complex copper ornamentation
Selecting an alternate roofing system for the low-slope lantern cornice that was not suitable for copper due to thermal expansion concerns
Specifying removal of stone balustrades, allowing for continuous through-wall flashing at vulnerable built-in gutters