World's tallest all-wood residential structure opens in London
An eco-focused Building Team employs 'jumbo plywood' and modern prefabrication techniques to create the world's tallest all-wood residential structure.
By David Barista, Managing Editor -- Building Design & Construction, 6/14/2009 12:00:00 AM
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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?
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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.
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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.
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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.
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Several readers inquired about the fire sprinkler system, or lack thereof. I asked the architect to address that topic. Response below:
"No, there is no fire sprinkler system. There is an integrated fire alarm and firefighting stair to the private units. The social housing units are on the first three floors of the building. As such, their fire escape is treated as a small building. The automatic opening vent is integrated with the fire alarm. However, it is important to note that the building has a fire protection class of F60 (I am sure your fire protection codes are different!) and in the event of a fire will retain its integrity for 90 minutes."
Dave Barista - 2009-1-7 07:27:00 MDT -
A response from the architect regarding fire protection at Stadthaus:
"In a fire, a solid wall of timber benefits from the protection of a charred layer, and, therefore, does not combust in the same way as a single stud. In Stadthaus, five-layer cross-laminated timber panels are used to obtain a fire protection that allows the structure to retain its integrity for at least 90 minutes. This is significantly longer than steel, which fails and buckles at high temperatures. Please note that the 90 minutes at Stadthaus have been achieved with the plasterboard finish."
Dave Barista - 2009-30-6 09:07:00 MDT -
Thanks for the comments guys. I'll follow up with the architect. I already have an email into him re: fire protection.
Dave Barista - 2009-18-6 10:36:00 MDT -
I assume they had to conventionally frame walls at electrical outlets and plumbing rough ins ?
Is there much shrinkage in the CLT panels ? Did they use any expansion joints ?
Jon Bryn - 2009-18-6 03:58:00 MDT -
Will the building have fire sprinklers installed through out? NFPA statistics for 2007 indicate residential structures accounted for 78% of all US structure fires. The article did not address the fire resistance of the composite wood structures.
Karl Yrjanainen - 2009-17-6 14:26:00 MDT
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