![]() |
In an effort to reduce carbon dioxide emissions and reliance on fossil fuels, the design team for the nine-story, 30-meter-tall Stadthaus tower in East London chose to build the structure entirely in wood. |
At a glance, East London's newest high-rise apartment complex looks like your typical multifamily residential tower. All 29 units in the nine-story, mixed-use development come standard with hardwood floors, granite countertops, stainless-steel appliances, and exterior balconies. Bright-white plasterboard finishes provide a blank canvas for residents, while large, operable windows let in fresh air and offer views of the surrounding Hackney borough.
But behind the high-end finishes is an all-wood structure that is as unconventional as construction gets these days. When it was completed this past January, the 30-meter Stadthaus tower stood as the world's tallest residential structure constructed entirely in timber and one of the tallest all-wood buildings on the planet.
Why use wood when concrete and steel are proven, economical solutions for high-rise construction?
![]() |
The tower’s structural system consists of cross-laminated timber (CLT) panels pieced together to form load-bearing walls and floors. Even the elevator and stair shafts are constructed of prefabricated CLT. |
For design architect Andrew Waugh, the decision to go with wood was purely a sustainable one.
"We'd been looking for ways in which we could replace concrete and steel construction wherever possible in an effort to reduce carbon dioxide emissions and reliance on fossil fuels," says Waugh, director of Waugh Thistleton Architects, which teamed with structural engineer Techniker Ltd. (both based in London) to design the structure for owner/developer Telford Homes, Hertfordshire.
Waugh says that by using wood for the structure instead of concrete or steel, the team was able to construct a building that has far less embodied CO2 emissions and reliance on fossil fuel—calculations show that the building will be carbon-neutral in just 21 years. The prospect of long-term CO2 emissions savings was enough to convince the client and local code and city officials to move ahead with the unusual, all-wood design scheme.
![]() |
![]() |
The finished apartments look like typical multifamily residential units, with bright-white plasterboard finishes and large, operable windows. But behind the plasterboard are solid wood panels instead of traditional steel or wood studs. The wall panels are 41/2 inches thick and the floor panels are six inches thick. |
Since traditional wood-frame construction is not rated for buildings taller than three or four stories, the design team had to come up with an alternative construction method for the Stadthaus project. Waugh's design team found a solution in cross-laminated timber (CLT), a process by which wood sandwich panels are formed by gluing timber strips together in a crisscross pattern to create a solid mass element with minimal movement characteristics.
"It's basically jumbo plywood," says Waugh, who says the panels can be anywhere from just under two inches thick to three feet thick, depending on the application. The result is a structurally rated unit that can be integrated with other panels to form load-bearing walls and floors for mid- and high-rise structures—without the need for concrete or steel structural members.
At Stadthaus, even the elevator and stair shafts are constructed of prefabricated CLT. The only concrete used in the building is for the foundation system and two-inch-thick floating slabs atop the timber floors for acoustical insulation.
![]() |
Cross-section shows the simplicity of the structural design. The cross-laminated timber walls and floors are held together with steel angles and screws. |
The design team specified 4½-inch-thick panels for the walls and six-inch-thick panels for the floors. Austria-based KLH fabricated panels and erected the final structure. All door and window openings were cut out in the factory using a CNC router. The finished panels were shipped to the job site, where they were craned into position and secured using two-inch galvanized steel angles and three-inch screws. In areas where additional reinforcement was required, screws were added to strengthen the structure. Progressive collapse is avoided by providing sufficient redundancy so that any single element can be removed without structural failure.
"The beauty behind the whole system is that it's incredibly simple," says Waugh, adding that it took the four-man KLH construction crew just 27 days to erect the nine-story structure. The construction time savings helped to compress the overall project schedule to just 46 weeks—40% shorter than if the team used traditional concrete frame construction, according to Waugh. "The guys building the structure come from the same factory where the timber panels were manufactured, so the understanding of the material is constant throughout the process."
Like most CLT manufacturers, KLH uses formaldehyde-free adhesive products, such as PUR, to form the panels, which are manufactured in 10×40-foot sheets. The panels have zero off-gassing and can be converted into biomass fuel at the end of their useful life—a process that KLH relies on to power its manufacturing facility and a nearby village.
"The material itself has an asset value throughout its life, unlike strand board, which is held together with formaldehyde- or solvent-based adhesives and must go into landfill," says Waugh. This means that the Stadthaus tower is completely recyclable and may one day be dismantled to help power London's omnibuses—or its electrical grid.
Related Stories
| Oct 4, 2013
Nifty video shows planned development of La Sagrada Familia basilica
After 144 years, construction on Gaudi's iconic Barcelona edifice is picking up speed, with a projected end date of 2026.
| Oct 4, 2013
Mack Urban, AECOM acquire six acres for development in LA's South Park district
Mack Urban and AECOM Capital, the investment fund of AECOM Technology Corporation (NYSE: ACM), have acquired six acres of land in downtown Los Angeles’ South Park district located in the central business district (CBD).
| Oct 4, 2013
CRB opens Atlanta office
Georgia’s status as a burgeoning hub for the life sciences industry has fueled CRB’s decision to open an office in Atlanta to better serve its clients in the market. CRB is a leading provider of engineering, design and construction services for customers in the biotech, pharmaceutical and life sciences industries.
| Sep 27, 2013
NYC releases first year-to-year energy performance data on commercial properties
A new report provides information on energy performance of New York City's largest buildings (mostly commercial, multi-family residential). It provides an analysis of 2011 data from city-required energy “benchmarking”—or the tracking and comparison of energy performance—in more than 24,000 buildings that are over 50,000 square feet.
| Sep 27, 2013
ASHRAE/IES publish first standard focused on commissioning process
ANSI/ASHRAE/IES Standard 202, Commissioning Process for Buildings and Systems, identifies the minimum acceptable commissioning process for buildings and systems as described in ASHRAE’s Guideline 0-2005, The Commissioning Process. Standard 202 is ASHRAE’s first standard focused on the commissioning process.
| Sep 26, 2013
6 ways to maximize home-field advantage in sports venue design
Home-field advantage can play a significant role in game outcomes. Here are ways AEC firms can help create the conditions that draw big crowds, energize the home team to perform better, and disrupt visiting players.
| Sep 26, 2013
Literature review affirms benefits of daylighting, architectural glazing
The use of glass as a building material positively impacts learning, healing, productivity and well-being, according to a white paper published by Guardian Industries and the University of Michigan Taubman College of Architecture and Urban Planning. The findings highlight the significant influence daylighting and outside views have on employees, workers, students, consumers and patients.
| Sep 26, 2013
Mobilizing your job site to achieve a paperless project: fact or fiction?
True mobility in the field has rapidly evolved from lock-box kiosks on each floor to laptops on rolling carts to tablets and iPads loaded with drawings sets stored in the cloud. And WiFi-ready job sites have gone from “nice to have” to “must have” status in just a little over a year.
| Sep 26, 2013
Leading in the face of change
As AEC firms navigate toward an uncertain future, the most effective leaders are those who eagerly adapt to change. Here are three attitudes that drive leaders who are of most value to their firms.
| Sep 23, 2013
The art of rewarding employees
What’s the best way to reward those employees who go the extra mile, particularly when it’s not always feasible to give large financial bonuses? According to author and “recognition expert” Dr. Bob Nelson, the most effective employee rewards are also the least expensive.