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This paper will address the inspection of an exterior stone facade for a commercial office building. The existing building was constructed during 1970 and 1971 with a cast-in-place concrete structural frame, which is clad with bonded travertine-faced precast concrete panels, mechanically anchored travertine perimeter column covers, and discontinuous strip windows. Travertine-faced precast concrete panels directly support the windows. The inspection procedures included the acquisition of existing drawings, document review, formulation of visual interior and exterior inspection procedures for cladding components, and physical testing recommendation development. Physical testing techniques included a laboratory examination of the weathered travertine; petrographic, chloride ion, and air void analysis of concrete cores taken from existing precast panels; and the locating of reinforcing bars within the existing precast panels. While the presence of widespread systemic failures of the stone cladding system are revealed, the inspections indicated that the precast panels are serviceable.
Architect, Director of Specifications, Gensler, Washington, DC
Stone & Tile Inspection Consultant, NTC Enterprises, Inc., Asheville, NC