The Smithsonian National Air and Space Museum in Washington, D.C., underwent a transformative multi-year renovation that seamlessly blended modern innovation with historical preservation. This project, which earned the prestigious NSI Pinnacle Award of Excellence, involved replacing the museum's exterior stone cladding with Colonial Rose Granite, significantly enhancing both its durability and aesthetic appeal.

The engineering challenges were considerable, particularly in designing a fully sealed, blast-resistant wall. The project required detailed analysis to address complex mullion geometries, intricate corner conditions, and the existing back-up framing, ensuring the design's structural integrity. Gravity anchors were meticulously engineered to support 60 feet of stone while accommodating installation tolerances and resisting wind, seismic, and blast loads. Additionally, careful detailing was necessary to account for thermal expansion of the 60-foot aluminum mullions, maintaining stability throughout the structure. The successful integration of modern materials and techniques with the museum's historical elements showcases a commitment to innovation while preserving the integrity of this iconic institution.