Restore the metal dome and mooring tower area to prevent corrosive effects of water infiltration. Metal dome enclosed an extensive array of broadcasting and telecommunications equipment. Multiple antenna masts penetrated through the metal dome, and were a source of leakage. The mooring tower area incorporated complex metal profiles that leaked as well.
Construct a sophisticated scaffolding system provide safe access to the work areas, which were located over 100 stories above street level. Kemperol waterproofing membrane was installed, and Kemperdur colored coating was applied to match the color of the existing metalwork. The flexibility of the Kemperol membrane allowed the fabrication of tight flashings around all antenna penetrations and decorative metal fabrications.
Encapsulate entire 20,000-square-foot metal roof structure in lieu of costly
replacement of 100-year-old copper metal seam roof requiring patina
Complete encapsulation of entire metal roof structure including all seams, skylights and flashings. Also applied Kemperol color topcoat to achieve patina green finish.
Specifications called for complete removal of existing metal copper roof
and installation of an expensive metal copper roof replacement causing
serious disruption for building occupants.
Kemper System offered a long-term, cost-effective solution by encapsulating the entire 20,000square-foot metal copper roof with Kemperol V210 membrane, thereby reducing labor costs and allowing the building to remain
operational throughout the project’s duration.
When the U. S. Capitol was expanded in the 1850s, the original wood-frame dome was replaced by a cast-iron dome. The plates, which together weigh about 4,450 tons, expand and contract slightly, depending on the weather. When several leaks were found and the water started penetrating into the Rotunda, an extensive restoration program was started in the late 1990s. Problematic were, among others, the 33 antefixes, characteristic elements derived from the ancient Greek and Rome design. Water had started leaking into the structure behind the architectural elements.
To prevent further deterioration waterproofing the dome behind the cast iron ornaments had become necessary. However, this turned out to present a challenge to the architect as the area is difficult to access and extremely tight to work at. A liquid-applied system that fully adheres to the substrate, following any shape and contour of the surface was the preferred solution. It gives the system the ability to withstand structural movements between elements of different materials and compensates for the impact of frost-thaw cycles. Kemper System waterproofing membranes incorporate a high tensile strength, polyester fleece reinforcement which can be tailored to the area that is to be waterproofed. In combination with the cold-liquid applied resin it forms a durable membrane.
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Empire State Building, NY
Staten Island Borough Hall, NY
Union League, Philadelphia, PA
US Capitol Dome, DC