Riverside Public Library

Riverside, Illinois

Designated an Illinois Historic Structure, the library required a building envelope evaluation to determine its condition after several additions were made to accommodate additional space needs. The building's exterior facade was primarily natural stone masonry with lead glass windows in cut limestone mullions, wood, and other masonry materials with built-up roofing and slate tile roofing systems. Provided recommendations for short- and long-term repairs and prepared details and specifications for repair and/or replacement of the low- and steep-slope roofing systems.

State of Ohio | Computer Center

Cincinnati, Ohio

Assessment of condensation problems including wall weeping and water discharge during cold weather. Initial assessment verification included instruments implanted in the wall to monitor behavior over several winter months. A computer-controlled data acquisition system took hourly readings of temperature, relative humidity and differential air pressure at several layers through the wall profile. In addition, two trial repairs where installed and monitored. An instrumentation program verified that movement of interior humidified air into the wall was the cause of the condensation problem. The program also indicated that the first repair alternative involving complete reconstruction of the wall from the interior side provided better condensation control than the second repair alternative involving upgrading the air barrier.

U.S. Nuclear Regulatory Commission Headquarters

Bethesda, Maryland

This 18-story federal office building was exhibiting cracking and loosening of the marble and granite facing on the precast concrete cladding system six years after completion.  The GSA's consultant had recommended a stone replacement program.  RRJ was engaged to further investigate the cladding system and make repair recommendations.  Field and laboratory testing and finite element analysis were performed to define the stone panel performance criteria necessary to identify stones requiring supplementary anchorages.  Once developed, the cladding stones were inspected using the criteria.  Design and contract documents were developed for all required repairs including auxiliary anchorage installation, crack repair, and replacement of stones with excessive damage.  Of the 14,000 stones on the building, only 873 required repair.  Quality Assurance measures were developed for the construction along with inspection of the repairs and construction administration throughout construction.