At 58 feet high, 1 De Haro—a 134,000 square foot office and light-manufacturing building completed earlier this year in San Francisco’s design district—is hardly the country’s tallest mass timber structure, but it is a first for the city. According to its architects Perkins&Will and the developer, SKS Partners, 1 De Haro is San Francisco’s first multi-story building made out of the material. And there could soon be many more, since California recently approved the tall wood provisions of the 2021 International Building Code (IBC), which allow mass timber buildings of up to 18 stories. The state is one of nine jurisdictions to adopt the standards so far.
Wrapped in a glass curtain wall, and with a triangular footprint, 1 De Haro is comprised of three stories of exposed glulam columns and beams, and cross-laminated timber (CLT) floor slabs, on top of a concrete podium. The resulting structure’s embodied carbon—the greenhouse emissions associated with manufacture of its materials—is about 15 percent less than one of concrete, say the architects. And that is without taking into account the carbon sequestering properties of wood. (Including this biogenic carbon, the savings would be 51 percent, according to Perkins&Will’s calculations).
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