Green Roof Guide: Facebook's Rooftop Forest

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Social Media Giant Opts for Innovative Gathering Space

Building 20 at Facebook's Menlo Park headquarters, also known as MPK 20, was designed by Frank Gehry and opened in March 2015. The 9-acre garden on the roof features roughly 360 trees and 110,000 shrubs, a half-mile walking loop and a meeting room. The irrigation system is a typical drip and sprinkler system that sits between the 18 inches of soil and 12-48 inches of extended polystyrene geofoam, which provides a lightweight base to anchor trees and sculpt hills and other landscaping features.

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