High Performing Buildings - Spring 2008 - (Page 15) tially analyzed. The elements of the building simultaneously contribute to its expression, functionality and energy performance. A 100 Year Building Seattle’s goal was to build a 100 year building. Creating a lasting, easy-to-maintain adaptable building was a sustainable strategy that formed the basis of many design decisions and sustainable solutions for Seattle City Hall. High-quality materials were selected for durability and ease of maintenance. Stone is used in the lobby and plazas. The durable natural material is treated only with a penetrating sealer that requires little maintenance and will wear well over time. Custom steel casings enclose the fireproofed lobby columns. The columns are simply painted and can withstand impacts requiring only repainting as a repair. Wood is used more sparingly and located where abuse from occupants will be limited, e.g., in the ceiling. Where wood is accessible, as in the sunshades around the council chamber, it is a solid stock maple that can withstand impact. Titanium panels highlight the council chamber volume. Although the material is costly, less material was used than comparable metals because its strength allows for application of thin sheets. The titanium is formed in small panels to reduce waste and conform to the tightly curved shape, interlocked to conceal fasteners as in a traditional metal roof. Titanium is extremely durable and was used in its unfinished state with a natural protective coating. Although the unfinished Horizontal exterior sunshades work in concert with lightshelves to protect workers from harsh afternoon light while reflecting and diffusing light deep into adjacent office space. Spring 2008 HIGH PERFORMING BUILDINGS 15
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