Historic Building Renovation with Rooftop Addition and Fire Stairs
This project adds a new rooftop addition and two new concrete fire stairs to the existing historic structure, all keeping within the allowable buildable footprint for the project. The new concrete fire stairs will have metal pan concrete stairs on the inside and clad on the outside with a GFRC rainscreen cladding over…
Source ID: us-nyc-city-record-procurement-design-and-construction-20250710012
Scope overview
This project adds a new rooftop addition and two new concrete fire stairs to the existing historic structure, all keeping within the allowable buildable footprint for the project. The new concrete fire stairs will have metal pan concrete stairs on the inside and clad on the outside with a GFRC rainscreen cladding over continuous insulation. The two fire stairs are connected at the 2nd level with a second-floor foyer.
The existing roof, a lightweight steel truss added in a renovation in the 1980s is to be removed and replaced with a new steel structure that provides a new roof and ceiling for the main reading room and support for the rooftop addition and rooftop garden above. Steel columns will carry this new roof down to the foundation, notched and concealed into the existing masonry walls.
The rooftop addition is a steel structure set on top of the new roof structure. The concrete stair volumes provide lateral support, with the old and new structures tied into a single system. CB: Brooklyn 16 Agency: Design and Construction Status: Award
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