SGH conducted an investigation that included close-up visual inspections and binocular surveys of the masonry walls, water testing, and observations of concealed conditions at exploratory openings in the masonry and curtain walls. We determined that the walls lacked an adequate cavity waterproofing system, and that there was significant leakage through curtain walls. In addition, we noted brick cracking, inadequate soft joints beneath steel relieving angles, and corroded relieving angles.
We prepared an analysis of remedial options with advantages and disadvantages and approximate construction costs.
SGH prepared construction documents that included replacement of the masonry at the north and south towers (with the addition of waterproofing, flashing, insulation), rebuilding of parapets at the north and south towers, replacement of the curtain wall at the stairs of the towers, and replacement of the roof at the Physics Building and the north and south towers.