Washington library topped with carbon-negative green roof

Washington library topped with carbon-negative green roof

Photo courtesy of Inhabitat

King County, Wash.’s Tukwila Library, a 10,000-square-foot building inspired by the city’s diverse community where more than 80 different languages are spoken, has been completed.

The new library showcases a variety of sustainable design strategies, including a green roof with a negative-carbon footprint, reports Inhabitat.

The building, built for the King County Library System, is 20 minutes south of Seattle in Tukwila, Washington. A community-focused “mosaic space” at the library’s center serves as a space for events, performances, contemplation, learning and reading.

“In designing the new library, we were inspired by the city of Tukwila’s rich cultural diversity, and set out to create a welcoming space that both services and celebrates it,” said Ryan Bussard, design principal with architecture firm Perkins+Will.

The building’s facade features charcoal terra cotta, zinc cladding, aluminum sunshades and red- and purple-toned glass finishes, while large windows provide plenty of natural light for the interior spaces.

One of the building’s most exciting features is its roof, which is made of carbon-negative cross-laminated timber. This wood sequesters the same amount of carbon emitted by 91 cars in one year.

Some of the roof is covered in a layer of heat- and drought-tolerant native plants that help regulate indoor temperatures while cutting stormwater runoff by more than 60 percent.


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