Heartwood is the first building in the United States completed as-of-right under the new Type-IV codes. Representing a significant development in tall timber construction, Heartwood provides not only “missing middle” housing for Seattle, but a replicable model for future tall timber buildings across the country. Heartwood is a 67,000 SF apartment building, providing missing middle housing for families making 60-100% of Seattle’s Area Median Income (AMI). Heartwood shares its site with the three-story affordable Helen V Apartments, owned and managed by the same local nonprofit, Community Roots Housing. Together, the Heartwood amenity spaces create a shared, unifying courtyard for both projects and communities.
The 8-story, centrally located building provides 126 units of workforce housing
The project provides a critical element of our urban housing
Heartwood’s Mass Timber superstructure is designed to be viable for 100 years or more
Heartwood’s post-and-beam structural system allows maximum flexibility
When its life is at an end, Heartwood’s materials can be reused in other projects.
Providing an exposed wood ceiling, exposed wood columns and beams exposed lobby and corridor ceilings
Units are compact, averaging 400 SF.
2023 - Constructed
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2023 - Constructed - Images
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Inspired by Japanese joinery
With an already tight urban site
The team had little lay down area and a time-restricted unloading lane large enough for only one truck at a time.
Mass timber allowed the team to meet these challenges
2023 - Constructed - Drawings and documents
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The Cascadia Biome has long been the heart of timber production in North America
Heartwood uses a hybrid mass timber post-and-beam superstructure with a steel Buckling-Restrained Braced Frame (BRBF) core. Glulam beams and columns support 5-ply CLT floor panels.
The primary building block for Heartwood’s post-and-beam structure
The project minimizes the use of high-carbon, non-renewable materials
Heartwood is a mass timber/steel hybrid structure
The condition of the soils on site incentivized keeping the foundations shallow.
Mass Timber structures are lighter than their concrete counterparts
Removing the steel from the column to beam connections