Bronx, New York (1899)
National Historic Site designed by Stanford White.
The Issue of Concern:
There was serious concern for public safety after a cast plaster ornament (rosette) fell off the ceiling of the Guastovino tiled dome. In addition, the large cast plaster figures were severely damaged by vandalism during student demonstrations.
Historic Plaster Conservation Services was retained to conserve the large cast plaster figures and hundreds of rosettes that populate the dome. A borescope was used to investigate the interior of the cast plaster figures, revealing numerous cracks.
HPCS devised a remote guided product delivery tool equipped with a syringe to inject HPCS AD 25 Gel™, an injectable dowel setting adhesive with thixotropic properties, into the cracks. This was done with minimal impact on the exterior of the figures. The rosettes were “dry” cleaned with soot sponges and re-secured with AD 25 Gel™. Pins were installed to give each rosette a mechanical connection.