Robert Hoag Rawlings Public Library
The Robert Hoag Rawlings Public Library in Pueblo, Colorado is an Antoine Predock-designed building featuring Zahner fabrication. The library is a new construction project which provides 109,000 SF of facility for residents of the Colorado town.
Built on the site of the original library, the design by Predock rises five stories to allow view of surrounding mountains and the Arkansas Valley. The building incorporates portions of the existing library and spans across Bates Lane to additional property to the South.
Zahner provided the interior and exterior copper metalwork with a preweathered patina. The building’s dark patinated copper tones allow it to absorb into its natural regional landscape.
Copper is a malleable and ductile metal with high thermal conductivity. A freshly exposed surface of pure copper has a reddish-orange color, which will quickly patinate under normal conditions.New copper can look as if it is on fire in low twilight, when the red wavelength of light is more prevalent. The surface of new copper is specular, moderately polished from the cold rolling process, imparting a burnishing effect on the copper. Like gold, copper absorbs most strongly on the red region of the light spectrum, hence reflect more intensely on the red scale. Thus, cloudy days have only a minor effect on the reflected light from gold and copper surfaces.Eventually, the surface of copper will oxidize and decrease in reflectivity, giving way to earthy tones of a dark matte, surface. After several years, the appearance will show signs of green verdigris in its crevices, and may completely turn green over the course of decades.
Manufacturing Details for Pueblo Library
The copper wall panels made by Zahner are 30 inches wide by 142 inches tall and number 1545 wall panels and 739 soffit. The building elevations were completely laid out as a digital model for accurate layout of custom panel expansion joints.
A total of 1,545 wall panels and 739 soffit panels were provided by Zahner. The copper panels were custom manufactured from 1.5mm thick copper plates and installed using the Inverted Seam Wall System.
The facade is clad in a darkened custom patinated panel system using the Dirty Penny patina on copper, an artistic patina with significant variation.