When layers of wood are put together in a specific way—usually glued together—they make for a material that has the structural strength of steel. And, surprisingly, is fire-proof. We're not talking log cabins but a specific kind of wood material commonly known in architectural circles as mass timber.

Portland International Airport’s new main terminal is part of a race to build the biggest building out of this wonder material. But exactly how sustainable is it? Figuring out exactly where the wood comes from, how it is grown and harvested, and how the mass timber products are used and reused is vital for getting an accurate picture of a mass timber building’s carbon footprint

Jacob Dunn and Marty Brennan, both Associate principals at ZGF, are two of the designers behind that Portland Airport Building. And they have developed a tool called the UpStream Forestry Carbon & LCA Tool, in partnership with the University of Washington, to track the amount of carbon sequestered—or emitted—by mass timber.

In this episode, Metropolis digital editor Ethan Tucker speaks with Jacob Dunn and Marty Brennan to learn more about their tool and why all wood buildings are not created equal.

Resources:

ZGF Architects Builds a Transparent and Inclusive Timber Assessment Tool

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