1800 K Street NW

SGH assisted with design of the new curtain wall system on the K and 18th Street elevations, windows and metal panels on the south face, street-level plaza waterproofing, and roofing at the main roof and the tenth-floor roof terrace. Highlights of our work include the following:

• Visiting the site to document existing conditions relevant to the proposed enclosure renovations
• Helping to coordinate the design with existing conditions, including the property line, which is very close to the slab edges
• Developing performance criteria for the enclosure systems, including air infiltration, water penetration resistance, and thermal performance
• Reviewing relevant drawings and specifications and recommending ways to improve the performance and durability of the new enclosure systems
• Developing details to integrate the various enclosure systems, adjacent building, and existing components, such as roof terrace doors and a skylight slated to remain in the final configuration
• Visiting the curtain wall manufacturer to observe and document their quality assurance/quality control procedures
• Observing performance testing of a curtain wall mockup at an off-site laboratory
• Collaborating with the project team to review submittals, respond to requests for information, and address field conditions during construction
• Visiting the site to observe ongoing construction and compare installed details with the design intent
• Observing field testing, including flood testing the roof terrace and water testing curtain walls to compare with performance expectations