The construction industry’s most persistent problems — high costs, labour shortages, and a carbon footprint that accounts for nearly 40 percent of global emissions — are not going away on their own. But a growing number of developers and engineers argue that the solutions already exist, and that mass timber construction in 2026 sits at the leading edge of a genuine transformation in how buildings are delivered. At a recent Urban Land Institute panel in Austin, Texas, four industry experts stepped onto a stage with the same message: the methods that can cut schedules in half, slash structural concrete use, and reduce embodied carbon by a third or more are not theoretical. They are being built right now.
A ULI Panel Puts Three Innovations in the Spotlight
The Urban Land Institute convened the Austin panel to examine construction techniques that are available to developers today, even if adoption remains slower than the industry’s climate commitments would warrant. Three technologies dominated the discussion: top-down construction, mass timber, and nanotechnology applied to concrete.
Daniel Esparza, principal of TGE Top Down, presented the case for lifting entire floor plates into place rather than building from the ground up. Lisa Podesto, Director of Mass Timber and Sustainable Construction Innovation at Swinerton, made the case for engineered wood as a structural alternative to concrete and steel. Chris Bishop, president of the National Concrete Refinement Institute, rounded out the panel with an update on nanoparticle additives that are quietly pushing the performance limits of conventional concrete.
The broader context for the panel is hard to ignore. Construction costs have climbed steadily. Skilled labour is scarce. Regulatory pressure on embodied carbon is intensifying. The three methods on the Austin stage each address at least two of those pressures simultaneously — which is why developers in the room were paying attention.
Top-Down Construction Builds Floors at the Ground — Then Raises Them
The logic of top-down construction sounds counterintuitive until you stand next to a worksite that is using it. Rather than stacking floors atop one another in sequence from the foundation up, tradespeople construct each floor at no more than six feet above grade — a working height that eliminates scaffolding, reduces fall hazards, and allows crews to work in a controlled near-ground environment. When a floor is complete, heavy-duty hydraulic jacks at the building’s core lift it into position. The process repeats, working from the building’s top floor downward, until the structure reaches its full height.
The method traces its roots to the Termohlen-Thornton system developed in 1973. It was revived when retired Thornton Tomasetti chairman Charles H. Thornton co-founded TGE Top Down with Jeff Grillo and Dan Esparza. In 2017, TGE licensed the system to LIFTbuild, a subsidiary of Detroit-area contractor Barton Malow, which used it to complete The Exchange — a 16-story, $64.6 million tower in Detroit’s Greektown neighbourhood. The Exchange holds 153 residential rental units, 12 condominiums, and approximately 6,000 square feet of commercial space, and it marked the first top-down high-rise built in the United States since the 1970s.
The structural efficiency gains are substantial. A conventional cast-in-place flat-plate concrete high-rise typically uses 250 to 300 pounds per square foot of concrete. A comparable TGE Top Down building averages 100 to 120 pounds per square foot — roughly half. Less material means lower embodied carbon, a smaller foundation footprint, and reduced structural dead load. Combined with the ground-level assembly advantage, TGE reports that its method can deliver a mid- or high-rise in approximately half the time of a conventional build.
Mass Timber Construction Gains Ground as a Structural Material
Lisa Podesto’s contribution to the Austin panel centred on a point that still surprises many developers: mass timber products can be stronger than concrete and steel on a per-ton basis. That claim is supported by fire test data, real-world structural performance, and an expanding body of research comparing cross-laminated timber (CLT) and glulam to conventional structural systems.
The fire resistance story is particularly relevant for high-rise applications. When exposed to fire, mass timber chars on the surface, forming an insulating layer that slows combustion and preserves structural integrity. In standardized testing, a seven-inch CLT wall has lasted more than three hours — a full hour beyond code requirements. Mass timber buildings also weigh roughly one-fifth as much as equivalent concrete structures, which reduces foundation costs and inertial seismic forces.
The manufacturing model compounds the advantage. Because mass timber components are produced in controlled factory environments rather than cast in place on site, dimensional tolerances are tight and quality is consistent. Developers of the Ascent building in Milwaukee — a 25-story mass timber hybrid — reported 90 percent less construction traffic, 75 percent fewer workers needed on site, and a build timeline 25 percent faster than a comparable concrete structure.
The carbon math is compelling as well. Mass timber produces approximately 30 percent fewer CO2 emissions than concrete and around 50 percent fewer than steel over a comparable life cycle. The U.S. market reflects growing confidence in those numbers: over 2,500 mass timber projects have been built or are in progress, and the sector is growing at roughly 20 percent per year. Deeper background on the product types and supply chain behind that growth is available in the overview of cross-laminated timber in North America.
Nanotechnology Moves Concrete Beyond Its Traditional Limits
The third innovation on the Austin panel’s agenda was the least visible but perhaps the most immediately applicable. Nanotechnology in concrete — the addition of engineered nanoparticles to the mix to enhance strength, durability, and impermeability — is not a new idea, but as Chris Bishop told the audience, it is gaining serious commercial attention.
“Nanotechnology, in which nanoparticles are added to concrete mix to provide strength and durability, is not new to the concrete industry, is gaining more attention.”
— Chris Bishop, President, National Concrete Refinement Institute, Urban Land Magazine
The underlying chemistry explains why the approach works. Materials such as nano-silica accelerate cement hydration, densify the paste matrix, and consume calcium hydroxide to form additional C-S-H gel — the primary strength-giving compound in hardened concrete. Carbon nanotubes and graphene oxide variants add tensile reinforcement at the molecular scale. According to research reviewed by AZOBuild, nano-concrete formulations can deliver up to 40 percent greater compressive strength than conventional mixes.
The commercialisation picture is more cautious. Most nano-enhanced concrete products remain at laboratory or early-commercial scale. Nano-silica particles and certain polycarboxylate nanoproducts are among the few formulations in broad use. Dispersion challenges and cost remain the primary barriers to wider adoption — though the trajectory, Bishop suggested, points toward mainstream use within this decade.
Taken together, the three methods the Austin panel examined share a common thread: they each reduce waste — structural material, construction time, site congestion, and embodied carbon — without sacrificing performance. For developers facing rising construction budgets and tighter sustainability reporting requirements, the question is no longer whether these approaches work. The Exchange in Detroit, the Ascent in Milwaukee, and a growing roster of mass timber buildings across North America have already answered that. The question is how quickly the rest of the industry will follow.
