Grand Central Terminal

After thorough investigation, including extensive sampling and water testing, SGH developed a rehabilitation program for the roofs and skylights to address:

• Fractured copper roofing as a result of thermal expansion/contraction that was not accommodated by the original design details
• Decades of “mastic” repairs that compromised ornamental copper details
• Broken skylight glass and skylights that were still partially covered with “black-out” building paper, a relic of World War II air raid precautions

We prepared plans and specifications, monitored the construction, and developed quality control inspection procedures for the repairs that included:

• Restoration of the rooftop stamped copper frieze with the installation of a concealed waterproofing membrane inside the copper enclosure to preserve the important ornamental element without sacrificing the building’s watertight integrity
• In-kind replacement of the batten seam copper roofing incorporating proper movement joints to ensure reliable and durable performance
• Replacement of skylight glazing to restore the light transmission of the original skylight, while providing impact resistance, condensation control, and energy efficiency consistent with current standards