Wednesday, January 14, 2026
The mass timber construction industry has reached a notable milestone as the U.S. Army Corps of Engineers (USACE) Seattle District, Joint Base Lewis-McChord (JBLM) Army Garrison, and leadership from the 1st Special Forces Group marked progress on the Department of War’s largest mass timber project to date. The five-story, 105,000-square-foot barracks, once completed, will provide modern accommodation for 200 soldiers while setting a new benchmark for sustainable military construction.
The Seattle District is overseeing both the design and construction management of the project, which represents the first mass timber structure of its kind to break ground within the Department of War (DoW). The initiative is intended not only to deliver functional, durable housing, but also to demonstrate that innovative materials such as cross-laminated timber (CLT) can meet stringent military standards for resilience, safety, and longevity.
According to USACE Seattle District leadership, the project reflects a deliberate push to modernise military infrastructure while reducing environmental impact. By utilising mass timber—engineered wood products formed by bonding layers of timber into large structural panels—the Army is exploring alternatives to conventional concrete and steel construction.
The barracks project was formally selected for the Army’s Mass Timber Pilot Program in early 2023, even though design work was already underway. The pilot programme was authorised under the Fiscal Year 2023 National Defense Authorization Act and directs each military department to assess mass timber’s performance in terms of sustainability, resilience, cost efficiency, and construction timelines.
For the Army, the initiative supports a broader objective: improving soldier readiness and morale through higher-quality living environments. Leadership at JBLM has emphasised that modern barracks are a critical component of operational effectiveness and overall quality of life for service members.
Introducing mass timber into a defence context required a fundamental rethink of traditional military design practices. While mass timber has a strong track record in private-sector commercial and residential projects, its use within the DoW has historically been limited.
Mass timber offers a lower embodied carbon footprint and can contribute to faster construction due to prefabrication. However, adapting the material to military requirements—particularly in a high seismic zone like the Pacific Northwest—presented complex engineering challenges. As a result, the JBLM project employs a hybrid structural approach, combining mass timber with other materials to meet seismic, fire, and force protection standards.
Despite common misconceptions, mass timber performs well in fire scenarios. Thick engineered timber elements char on the outside, forming a protective layer that preserves structural integrity—an attribute comparable to heavy timber construction used for centuries.
For USACE’s in-house design team, the project demanded an unusually high level of collaboration. Structural engineers, architects, and building services specialists worked closely to integrate mass timber into every aspect of the design. Because the project was already 35% designed when it entered the pilot programme, significant redesign was required—turning the effort into both a technical and organisational test.
Engineers involved in the project described the process as a departure from routine workflows. Unlike familiar materials, mass timber required constant cross-disciplinary coordination to ensure compatibility between structure, fire protection, mechanical systems, and architectural intent. This integrated approach was made possible by USACE’s in-house delivery model, which allowed rapid communication and problem-solving across teams.
To support mass timber adoption across the DoW, updated technical guidance has been critical. The department has developed Unified Facility Guide Specifications for cross-laminated timber and glued-laminated construction, aligning military standards with the 2021 International Building Code. These updates formally recognize modern mass timber construction types and enable a broader range of wood-based structural systems.
External organizations, including WoodWorks, the American Wood Council, and the U.S. Department of Agriculture’s Forest Products Laboratory, have also played a key role. Their training, research, and technical support have helped expand understanding of mass timber within USACE and across the defense construction community.
As a pilot project, the JBLM barracks will generate valuable data to guide future military construction. USACE’s Engineer Research and Development Center (ERDC) is analysing detailed cost, material, and performance data provided throughout the build.
Two major evaluations—a life-cycle cost analysis and a life-cycle environmental assessment—will determine whether mass timber delivers measurable advantages over traditional construction methods. The findings will inform future design standards, procurement strategies, and material recommendations across the DoW.
If successful, the project could pave the way for wider adoption of mass timber in military facilities, including the possibility of fully timber-based structures in suitable locations. More broadly, it signals growing confidence in mass timber as a viable, resilient, and low-carbon solution for large-scale institutional construction—both within the defense sector and beyond.
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Tags: cross-laminated timber military buildings, JBLM barracks project, low-carbon construction materials, mass timber construction industry, mass timber pilot program, sustainable military infrastructure, USACE mass timber barracks
