Wooden Skyscrapers Are On The Rise
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Wooden Skyscrapers Are On The Rise

Architects and builders turn to ‘mass timber’—an engineered wood product similar in strength to concrete and steel—to build multistory buildings.

By ERIC NIILER
Tue, Apr 12, 2022 10:04amGrey Clock 5 min

Guests at a new 20-storey hotel and cultural centre in Skellefteå, a former gold-mining community in northeastern Sweden, don’t have to step outside to feel immersed in the natural world. The floors, ceilings and support beams of the building—which also houses a museum and other facilities—are made almost entirely of spruce and pine harvested from nearby woodlands.

“When you come inside, the smell of the timber is almost like you enter a forest,” Robert Schmitz, a partner at an architectural firm in Stockholm and the building’s lead architect, says of the Sara Cultural Centre and Wood Hotel. “This is a really small city, and timber is something that everyone in this community has a connection to. They understand the material.”

The 30,000-square-metre complex is part of an emerging trend as architects, developers and builders turn to so-called mass timber, wood that is glued and pressed in special ways to make it similar in strength to concrete and steel and thus capable of replacing those building materials even for skyscrapers and other massive edifices.

Advocates of mass-timber construction maintain that it can be more environmentally friendly than conventional construction. The carbon footprint of a building constructed with sustainably harvested mass timber, which is made from trees that are selectively cut rather than clear-cut, can be half that of a similar building made of concrete and steel, according to an assessment of mass timber construction published recently in the journal Sustainability.

“If you look at the carbon impact of harvesting trees and turning them into buildings, it gives you a much better number than you get from concrete or steel,” says Stephen Shaler, a professor of sustainable materials and technology at the University of Maine. “As long as you have sustainably managed forests—and we have that capacity—it is a clear winner on the carbon footprint.”

The number of multistorey mass-timber buildings being built in the U.S. rose 50% between July 2020 and December 2021 to more than 1,300 structures, according to the wood trade group WoodWorks. Among the projects are an eight-storey office building in Charlottesville, Va., a new Google five-stoery office building scheduled to open in August in Sunnyvale, Calif., and a 25-storey residential-retail complex rising in Milwaukee. The International Building Code permits wooden buildings of up to 18 stories, but the developers of the Milwaukee project say they obtained a variance after submitting data to city officials showing it was as safe as a conventional building.

Even more ambitious projects may appear: A Japanese timber company has proposed a 70-story wood building for Tokyo, while a U.K.-based architectural firm has plans for an 80-story skyscraper in London.

To meet the demand for mass timber, 18 manufacturing plants have been built in the U.S. and Canada since 2014, according to the U.S. Forest Service. The global market for mass timber was estimated at $956 million in 2020 and is expected to grow at an annual rate of 13.6% from 2021 to 2028, according to a December 2021 report by Grand View Research.

In addition to potential environmental benefits, construction experts say mass-timber buildings can cost less than concrete-and-steel structures—especially if they’re sited near a manufacturing plant where pieces of the building are cut to order. With mass timber, for example, builders don’t have to pour concrete and wait for it to set. Mr. Schmitz and the team behind the Sara Cultural Centre say they saved a year in construction and labor costs as the wood panels and beams were made at a nearby plant.

Using mass timber cut the timeline for the Milwaukee complex, called Ascent, by about four months, says Tim Gokhman, managing director of the Milwaukee-based New Land Enterprises and the project’s manager. Because wood is lighter, only 100 support piles had to be driven into the site’s soft soil rather than the 200 that would have been needed for a similar concrete-and-steel building. And whereas pouring concrete floors might require 30 to 40 workers, he said, only 10 workers were needed to install the cross-laminated timber, or CLT, panels for each floor.

CLT is made by laying down and gluing together multiple wooden pieces oriented at 90-degree angles to one another and is commonly used for floors and walls. Another key type of mass timber, called glulam for glue-laminated timber, is commonly used for support beams.

“Each piece of wood is measured and has a designated place,” Mr. Gokhman says. “So as the building is built, you’re literally updating its progress in a digital world. Without that technology, you don’t have the same efficiency and schedule gains.”

Some point to limitations of mass timber, saying that buildings made with both conventional and mass-timber construction can have advantages over those made solely of wood or solely of steel and concrete.

“In a tall building, you really do want the base of it to be concrete, and as you go up in the building it gets lighter, and makes more use of wood,” says University of Oregon architecture professor Judith Sheine, who has designed buildings using both mass timber and concrete and steel. And conventional construction might be better in coastal areas, she says, adding, “If you’re in a flood zone, the base should still be concrete because getting wood wet is not that great.”

Some fear the mass-timber trend could spur timber companies to cut down old-growth forests that contain large amounts of carbon rather than selectively harvesting younger forests. They argue that calculations of the carbon footprints of mass timber buildings must include roots, branches and other parts of trees that are often burned as well as the fossil fuels consumed to cut down the trees, fabricate the wood products and transport them to construction sites.

“We’re not going to log our way out of the climate crisis,” says Jason Grant, manager of corporate engagement, forests, for the World Wildlife Foundation in San Francisco. “There are objective limits to how much timber we can produce and consume. We need to bear in mind the constraints that we need to operate in if we want to avoid climate disaster and stem nature loss.”

Seismic testing of a 10-storey tall wooden building scheduled to take place in California this fall could give a boost to the mass-timber trend. “We need to find a way to make these buildings earthquake-resistant, since it’s a new building type, and nobody’s ever done this before,” says Shiling Pei, associate professor of civil and environmental engineering at the Colorado School of Mines and the project leader for the shake test.

To minimize the risk of fire, builders and architects are incorporating precautions into mass timber buildings, says David Barber, a Washington, D.C.-based fire safety engineer with the multinational design, engineering and architectural firm Arup. He points to covering CLT wall and floor panels in taller mass timber buildings with fire-rated drywall rather than leaving them exposed, for example, and checking the fire rating for connection points between the timber panels as well as the glue connecting the panels and laminated timber.

“We want to make sure that the buildings are done in very conservative ways, so they are being designed to a very high level of safety,” says Mr. Barber, who has worked on both the Ascent building in Milwaukee and the eight-storey Apex building in Charlottesville.

Tests of a two-storey mass timber apartment conducted in 2017 at a Bureau of Alcohol, Tobacco and Firearms facility in Beltsville, Md., showed that it took longer to catch fire and retained its structural integrity longer than a similar wood-frame structure.



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Emma Stone Asks $26.5 Million for Freshly Renovated Austin Home

The actress and her husband, comedy writer Dave McCary, spent more than three years restoring the house, which is one of the priciest properties for sale in the Texas city.

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In 2021, actress Emma Stone purchased a historic estate in Austin, Texas, with a plan to move her family there. Four years later, she has instead decided to put the property on the market.

The actress and her husband, comedy writer Dave McCary, are asking $26.5 million for the newly renovated estate, according to Eric Moreland of Moreland Properties/Forbes Global Properties, one of the listing agents. The 1.25-acre property, located in the upscale Tarrytown neighbourhood, will be among the most expensive on the market in Austin.

Stone and McCary have spent more than three years renovating and restoring the Texas property, Moreland said.

A spokesperson for Stone didn’t respond to requests for comment. Moreland said the couple’s New York business interests have expanded since they started the remodel, and while they hope to live in Austin eventually, it doesn’t make sense for now.

The couple, who are co-founders of the production company Fruit Tree, own a roughly $12 million apartment in lower Manhattan, according to property records. Stone is slated to star in the upcoming contemporary Western film “Eddington.”

It’s unclear what Stone and McCary paid for the Austin property, since Texas is a nondisclosure state . The Georgian-style brick house dates to around 1940, making it one of the oldest estates in the area.

The roughly 10,000-square-foot estate includes a main house with four bedrooms and a two-bedroom guesthouse. The property also has a pool, a hot tub, and a garage with a screening room and entertaining space above.

As part of the renovation, the couple removed, cleaned and reused all the exterior brick. They also reconfigured some of the living spaces, opening the kitchen to the living room for a more modern layout. It took more than a year just to install the millwork in the screening room, said Moreland.

The contractors are now putting the finishing touches on the property, he said.

The “La La Land” actress has a track record of buying and selling her homes for significantly more than she paid. In 2022, she sold her blufftop Malibu, Calif., home for $4.425 million after buying it for $3.25 million in 2018, according to property records.

Last year, she sold her home in L.A.’s Comstock Hills neighbourhood for $4.3 million, significantly more than the $2.3 million she paid in 2019.

Austin saw an influx of new residents during COVID, but many of those are now returning to the East and West coasts, particularly workers in the tech sector.

While the market “has come down to earth a little bit” since the pandemic-era boom, Moreland said, he has seen a number of $20 million-plus deals over the past few months.

Moreland has the listing with colleague Diane Humphreys.

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