How Amazon Achieved Crystal Clarity in its Glass Domes

Sourced from Architect's Newspaper

NBBJ designed a trio of connected glass orbs with living walls at the new Seattle headquarters for online retail giant Amazon. According to an announcement on Amazon’s blog, the spherical design—a project seven years in the making—was “chosen due to its natural occurrence in nature and as a nod to historic conservatories, like Kew Gardens.” This atypical meeting place away from the typical office towers provides a treehouse-like environment for employees, complete with terraces, water features, soaring staircases, and wooden decking.

The construction required more than 620 tons of steel supported by a burly concrete base to buttress the triangular insulated glass units fashioned from modularized Vitro glass. The open floor plan comprised three spherical units enveloped in Ultra-clear Vitro Starphire low-iron glass, which allows for higher visible light transmission, heightening views from multiple angles. “Iron is what makes glass appear green,” said Andre Kenstowicz, Vitro Glass manager on the project. “Low iron Starphire glass eliminates the ‘green’ hue of traditional clear glass so the only green that you see is from the 300 species of tropical plants inside of the Amazon Spheres.” There are around 40,000 plants in the project.

Like all three domes, the largest is glazed by the contractor Enclos with Vitro’s Solarban Solar Control 60 Low-E coating in double laminate, measuring approximately 90 feet tall and 130 feet wide. All 2,643 panels of glass achieve 73 percent visible light transmittance and a solar heat gain coefficient of 0.40 across the visibly sinuous surface. This film beneath the surface limits the amount of radiation entering and consequently helps the interior to remain a stable, cool temperature.

Click here to read the full article