Mass Timber Rising: How the T3 Minneapolis Tower Showcases the Future of Wood Construction

The construction industry has long relied on concrete and steel for large commercial buildings, but a growing movement is challenging this convention by turning to an older material in new ways. The opening of a seven-story office building in Minneapolis known as T3 — short for timber, transit, and technology — marked a pivotal moment for mass timber construction in North America. At 224,000 square feet, the building became the largest heavy timber structure on the continent when it opened in late 2016. Constructed primarily from glulam beams and columns combined with nail-laminated timber (NLT) panels, T3 demonstrated that wood can compete with concrete and steel on performance, cost, and aesthetics. While the first floor and central elevator core use concrete and some steel framing appears in the structure, the vast majority of the building is exposed wood — a deliberate design choice that celebrates the material rather than hiding it behind drywall. For professionals and enthusiasts interested in how engineered wood products are reshaping the built environment, this project offers a compelling case study in modern structural timber engineering applied at scale.

Design Philosophy and Project Background

T3 was developed by Hines, an international real estate firm based in Houston, and designed by Michael Green Architecture in collaboration with the DLR Group. The architect intended the building to complement the historic warehouse district in Minneapolis’s North Loop neighborhood, where it now stands. The choice of exposed timber was not merely structural but aesthetic — the warm tones and visible grain of the wood create an environment that feels markedly different from the typical commercial office interior. The building includes 12,000 square feet of ground-floor retail space and 10,000 square feet of tenant amenities such as a fitness center and bicycle parking for 100 bikes. This integration of commercial and commuter-friendly features reflects the “transit” and “technology” components of the T3 name. The project also drew on advanced construction materials that combine traditional wood with modern engineering techniques to achieve performance parameters suitable for a multi-story commercial structure.

Why Nail-Laminated Timber Became the Material of Choice

The structural heart of T3 lies in its floor and roof panels, which were fabricated using nail-laminated timber. Unlike cross-laminated timber (CLT), which stacks layers of lumber in alternating orientations, NLT is made by arranging standard 2×8 dimensional lumber on edge and nailing them together to form solid panels. StructureCraft, the fabricator responsible for manufacturing and assembling the wood components, chose NLT over CLT or glue-laminated timber (GLT) for several practical reasons: high strength, lower material cost, and shorter procurement times. The 1,100 NLT panels used in the building range in length from 10 feet to 40 feet and incorporate 1.4 million linear feet of softwood lumber. Most of this wood came from trees killed by the mountain pine beetle, a choice that turned an ecological problem into a construction resource. A parallel example of timber innovation can be seen in the New York timber home project by Marchetti and New Energy Works, which demonstrates how timber construction adapts to different scales and contexts.

Construction Speed and Assembly Logistics

One of the most impressive aspects of the T3 project was the speed of construction. StructureCraft’s crews erected the glulam frame and installed 180,000 square feet of NLT panels in just nine and a half weeks. This rapid assembly was made possible through careful off-site prefabrication and meticulous labeling of every component. Each panel, column, and beam was catalogued so that on-site crews knew exactly where each piece belonged. The NLT panels themselves were fabricated in a temporary workshop that StructureCraft set up in Winnipeg, then trucked several hundred kilometers south to Minneapolis. The glulam columns and beams came from a European supplier and were shipped to Winnipeg already milled and fitted with steel connector hardware. This pre-planned logistics chain demonstrates how curved timber techniques and precision fabrication methods are expanding what is possible with wood structures. Despite the complexity of coordinating manufacturing across multiple sites, the project was assembled with a surprisingly small crew — as few as six to eight workers on site at any given time.

• Nine and a half weeks to erect glulam frame and install NLT panels
• Panels prefabricated off-site in Winnipeg and trucked to Minneapolis
• Glulam shipped from European supplier pre-milled with connector hardware
• On-site crew of only six to eight people for assembly
• Every component labeled and catalogued for precise placement

Structural Advantages of Wood Over Steel and Concrete

The choice of heavy timber produced several measurable structural benefits. StructureCraft reported that T3 is 30 percent lighter than an equivalent steel-frame building and 60 percent lighter than a post-tensioned concrete structure. This significant reduction in weight translates directly into savings on foundation costs and lower seismic loads — a lighter building exerts less force on its foundation during an earthquake. Another critical advantage involves fire safety. Unlike steel, which loses strength rapidly when heated and requires spray-on fireproofing, heavy timber members develop a predictable char layer when exposed to fire that insulates the undamaged wood core and maintains structural integrity. T3 required no additional fireproofing on its wood elements, eliminating both material costs and construction time. The wood in the building will also sequester approximately 3,200 tons of carbon over its lifetime, providing a meaningful environmental benefit. These performance characteristics build on principles found in early New England post and beam construction, where craftsmen understood the inherent strength and durability of well-designed timber framing.

Acoustics, Vibration Control, and Interior Finishes

Timber buildings are inherently lightweight, which creates challenges around acoustics and floor vibration. The T3 design team addressed this by adding a 3-inch layer of concrete reinforced with wire mesh on top of each NLT panel, which was itself capped with a 15/32-inch layer of OSB. This concrete topping slab serves a dual purpose: it provides the mass needed to dampen sound transmission between floors and reduces the vibrations that would be noticeable when people walk or jump on the floor. A layer of acoustic insulation was also incorporated into the assembly. The exposed wood ceiling inside the building eliminated the need for suspended acoustic tile ceilings and gypsum wallboard finishes — items that are standard in conventional commercial construction but costly. Michael Green Architecture associate Candice Nichol noted that the visible texture of the NLT panels is beautiful, with small imperfections and color variation in the mountain pine beetle wood adding to the warmth and character of the interior space. This design approach follows traditions seen in traditional timber framing techniques where structural elements are left exposed as a feature rather than concealed.

The Broader Mass Timber Movement

T3 opened in 2016, but it was far from the last word in tall wood construction. Even before its completion, taller mass timber buildings were already in the planning pipeline. A 12-story mixed-use tower in Portland, Oregon, and a 10-story residential building in New York City were slated to begin construction the following year. In Vancouver, an 18-story CLT student residence at the University of British Columbia was already under construction. Europe had already built half a dozen timber buildings over six stories, with Norway holding the height record at a 160-foot tower. Building codes in the United States have historically been slow to recognize heavy timber as a viable structural system for tall buildings, in part due to fire safety concerns. However, as architect Paul Coats of the American Wood Council pointed out, mass timber offers high fire resistance through its solid wood slab construction, which chars predictably and maintains strength far longer than unprotected steel. For a deeper look at the material science behind these structures, the properties of cross-laminated timber in tall buildings explain why mass timber has become a viable alternative to conventional structural systems. The T3 project demonstrated that a commercially viable, code-compliant, and architecturally compelling heavy timber building could be delivered on budget and on schedule — paving the way for the wave of tall wood buildings that followed.