National Restoration Systems, Inc.

Scope Of Work

Project: Carlyle Roof Sundeck Rehabilitation 
Owner Reference: The Carlyle Apartments Homeowners Association 
Location: Chicago, IL 
Engineer Reference: CTLGroup

Winner of the 2014 ICRI Award of Excellence in the Repair of Special Projects

Scope:

Remove Existing Roof & Railing Systems
Cast New Structural Concrete Curb
Install New Hydro Tech Roofing System
Concealed Tie-Back System
Hanover Paver System
Sterling Dula Railing System
High Performance Coatings

 

The roof sundecks, constructed circa 1966, are located at the north and south ends of a 39-story luxury condominium building. Typical plan dimensions of each sundeck are approximately 71 by 40 ft (21.6 by 12.2 m). Structural framing consists of flat-plate floor slabs supported by concrete columns.

By 2005, the sundecks were besieged with problems associated with persistent widespread water infiltration into the interior, concrete slab deterioration, decaying wood decking, and severe corrosion of the original railings and outrigger rope descent systems.

The building owner engaged consulting engineers to perform a comprehensive field investigation and materials test to determine the extent of deterioration of roofing, concrete slab, steel railing, and rope descent systems; evaluate the causes of leakage; and recommend appropriate steps for repair and maintenance. The results led engineers to recommend complete replacement of the roofing, decking, railing, and rope descent systems.

Due to the localized nature of roof slab deterioration, concrete patch repairs were recommended. This work required extreme care in design, sequencing, and execution to access sundecks on the building roof via swing stages, maintain structural support during column strengthening repairs, and minimize disruption to the regular use of the building. Even so, the base bid work on this project was completed ahead of schedule and under budget. The durability and aesthetics of the sundecks are improved significantly.