How 'Plyscrapers' Are Replacing Concrete and Changing the Global Skyline

The skyline of Milwaukee is changing, and the material driving its newest ascent is not steel or concrete, but wood. Construction is currently underway on The Edison, a 31-story residential and commercial tower that, upon its topping-out, will become the tallest mass timber building in the world. Reaching 362 feet into the air, the $200 million project represents a dramatic shift in how modern cities are being built.[1]

The Edison will actually steal the height record from a neighbor just a few blocks away: Ascent MKE, a 25-story timber tower completed in 2022. This concentration of wooden high-rises in the American Midwest is part of a surging global movement. From the 14-story Academic Wood Tower rising at the University of Toronto to sprawling hybrid complexes in Sydney, the era of the "plyscraper" has officially arrived.[1][2]

For over a century, the architectural consensus was that skyscrapers required a skeleton of steel and a foundation of concrete. Wood was relegated to single-family homes and low-rise apartments, limited by its natural tendency to warp, twist, and snap under immense vertical loads. But a breakthrough in materials science has fundamentally rewritten the rules of structural engineering.[4][8]

The secret behind the plyscraper is an engineered product known as Cross-Laminated Timber, or CLT. First developed in Europe in the 1990s, CLT is manufactured by taking standard solid-sawn lumber boards and gluing them together in thick layers. The critical innovation lies in the geometry: each layer of wood is oriented at a strict 90-degree angle to the one beneath it.[7][8]

Regular timber is an anisotropic material, meaning its physical strength changes depending on the direction the force is applied—it is strong along the grain but weak across it. By alternating the grain direction in three, five, or seven layers, the resulting CLT panel neutralizes this weakness. The finished slab achieves immense structural rigidity in both directions, rivaling the compressive and tensile strength of reinforced concrete.[4][8]

The environmental implications of this technology are staggering. The traditional construction sector is a massive driver of climate change; cement production alone is responsible for roughly 8% of all global carbon dioxide emissions. Concrete emits nearly its own weight in CO2 during the manufacturing process, creating a massive "embodied carbon" footprint before a building even opens its doors.[2][6]

Mass timber flips this equation from carbon-positive to carbon-negative. Trees naturally absorb carbon dioxide from the atmosphere as they grow. When that wood is harvested and engineered into CLT panels, the carbon is sequestered—locked away inside the building's structure for decades or centuries. A single cubic meter of mass timber stores approximately one ton of carbon dioxide.[6][7]

Beyond the climate benefits, developers are flocking to mass timber for its sheer speed. Unlike concrete, which must be poured on-site and requires weeks to cure and dry per floor, CLT is prefabricated in highly controlled factory environments. Using Building Information Modeling (BIM) software, manufacturers cut the panels to millimeter precision using CNC machines, pre-routing spaces for windows, doors, and plumbing.[4][7]

When the panels arrive at the construction site, they are hoisted by cranes and slotted together like a massive Lego set. This dry-assembly process requires a fraction of the traditional labor force and drastically reduces neighborhood noise pollution. In Vancouver, an 18-story mass timber student residence at the University of British Columbia had its entire wooden structure assembled in just eight weeks.[4][7]

Despite these advantages, the most common question raised by the public and city regulators alike is one of safety: Won't a wooden skyscraper burn? The Great Fire of London and the Chicago Fire left deep cultural scars regarding urban timber, but engineered mass timber behaves entirely differently than the light-frame two-by-fours used in suburban housing.[4][8]

When exposed to extreme heat, thick CLT panels do not easily ignite. Instead, the outer layer of the wood chars. This layer of carbonized char acts as a natural thermal insulator, protecting the unburned structural core of the wood from the heat. In rigorous fire testing, mass timber has consistently maintained its structural integrity longer than unprotected steel, which can rapidly warp, buckle, and collapse when subjected to high temperatures.[4][7]

However, the plyscraper revolution still faces engineering hurdles, primarily regarding wind. Because timber is roughly five times lighter than concrete, holding a wooden skyscraper down is often more challenging than holding it up. At extreme heights, the sheer lightness of the material makes the building susceptible to uncomfortable swaying in high winds.[4][7]

To solve this, almost all ultra-tall timber projects—including The Edison and Ascent MKE—utilize a hybrid structural system. They rely on a reinforced concrete elevator core to anchor the building and provide lateral stiffness, while the surrounding floors, columns, and walls are constructed entirely of mass timber. This hybrid approach maximizes the carbon benefits of wood while satisfying strict seismic and wind-load safety codes.[1][8]

The industry is also pushing the boundaries of what wood can do aesthetically. At the 2026 International Mass Timber Conference in Portland, Oregon, architecture firm Lake Flato and engineering group StructureCraft unveiled a groundbreaking pavilion made of Dowel-Laminated Timber (DLT). Unlike rigid, flat CLT slabs, this system used hardwood dowels and friction—no glue or nails—to create bending-active, curved wooden shells.[3][5]

This innovation proves that mass timber is no longer restricted to flat, rectilinear designs. By draping flat-packed panels into curved shapes on-site, engineers can create highly efficient structural shells that mimic the sweeping forms previously only possible with poured concrete or bent steel.[3][5]

As building codes across North America and Europe continue to update to allow for taller timber structures, the material is transitioning from a niche architectural experiment to a mainstream solution. By returning to humanity's oldest building material and reinventing it through modern engineering, the construction industry is finding a way to build the cities of the future without destroying the climate.[2][6]