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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We reveal the No. 1 areas for price growth in each capital city

By Bronwyn Allen
Thu, Jul 18, 2024 3 min

Home values across Australia rose by a median 8 percent in FY24, delivering the equivalent of $59,000 in new capital growth to the two-thirds of the population that owns a home, according to CoreLogic data. Investors received total returns of 12.2 percent over the year, including capital gains and gross rental income.

Very tight supply and demand in most capital cities except Melbourne and Hobart was a significant driver of the capital growth, with the smaller and more affordable capital cities of Perth, Brisbane and Adelaide experiencing the most price appreciation over the year. A lack of properties for sale trumped the usual dampening effect of higher interest rates.

As usual, some areas outperformed their city’s median growth benchmark. Here are the top SA3 areas for capital growth in each capital city of Australia in FY24. SA3 areas are large suburbs, or districts incorporating clusters of suburbs, with more than 20,000 residents.

 

Sydney

Home values across Sydney rose by a median 6.3 percent in FY24. The No. 1 area for growth was Mount Druitt. Its median value rose by 13.96 percent to $859,939. Mount Druitt is located 33km west of the CBD. It incorporates the suburbs of Mount Druitt, Ropes Crossing, Whalan and Minchinbury. The Mount Druitt community is very multicultural with almost one in two residents born overseas. It is home to many young families, with the median age of residents being 33 compared to the NSW median of 39.

 

Melbourne

Home values across Melbourne rose by a median 1.3 percent in FY24. The top area for capital growth was Moreland-North with 4.71 percent growth. This took the district’s median home value to $746,488. Moreland-North includes the suburbs of Hadfield, Pascoe Vale and Glenroy. It’s a multicultural community with a particularly large contingent of residents with Italian ancestry. One or both parents of 66 percent of residents were born overseas, according to the 2021 Census.

 

Brisbane

Home values across Brisbane rose by a median 15.8 percent in FY24. The No. 1 area for growth was Springwood-Kingston in Logan City. Its median value swelled by 25.55 percent to $710,569. Springwood-Kingston is approximately 22km south of Brisbane CBD. It incorporates the suburbs of Springwood, Kingston, Rochedale South and Slacks Creek. It is a multicultural community with one or both parents of 55 percent of the residents born overseas, according to the 2021 Census. More than 15 percent of residents have Irish or Scottish ancestry.

 

Adelaide

Home values across Adelaide rose by a median 15.4 percent in FY24. The best area for capital growth was Playford in Playford City. Its median value soared by 19.94 percent to $530,991. Playford is approximately 40km north of Adelaide. It incorporates the suburbs of Elizabeth Downs, Elizabeth Grove, Angle Vale and Virginia. It is home to many young people under the age of 40. The median age of residents is 33 compared to the state median of 41.

 

Perth 

Home values across Perth rose by a median 23.6 percent in FY24. The No. 1 area for growth was Kwinana in Kwinana City. Its median value skyrocketed by 33.19 percent to $618,925. Kwinana is approximately 37km south of Perth CBD. It includes the suburbs of Leda, Medina, Casuarina and Mandogalup. Henderson Naval Base is located here and there is a significant community of servicemen and ex-servicemen living in the area. It is home to many young families, with the median age of residents being 33 compared to the state median of 38.

 

Canberra

Home values across the nation’s capital rose by a median 2.2 percent in FY24. The best area for capital growth was Weston Creek. Its median value rose by 5.24 percent to $937,740. Weston Creek is approximately 13km south-west of the CBD. It includes the suburbs of Weston Creek, Holder, Duffy, Fisher and Chapman. Approximately 43 percent of residents have a bachelor’s degree, which is on par with the ACT median but much higher than the national median of 26 percent. Household incomes are about 35 percent higher than the national median. Almost one in five residents work in government administration jobs.

 

Hobart

Home values across Hobart fell 0.1 percent in FY24. The top performing area for capital gains was Sorell-Dodges Ferry with 2.78 percent growth. This took the area’s median home value to $615,973. Sorell-Dodges Ferry is approximately 25km north-west of Hobart. It incorporates the suburbs of Richmond, Sorell, Dodges Ferry, Carlton and Primrose Sands. The area has a large community of baby boomers and retirees, with the median age of residents being 43 compared to the Australian median of 38.

 

Darwin

Home values across Darwin rose by a median 2.4 percent in FY24. The No. 1 area for growth was Litchfield. Its median value moved 3.21 higher to $672,003. Litchfield is about 37km south-east of Darwin and includes the suburbs of Humpty Doo, Acacia Hills and Southport.  It has a high proportion of middle-aged residents, with the median age being 39 compared to the territory median of 33. About 12 percent of residents are Indigenous Australians. The biggest industries are government administration and defence. Median household incomes are about 35 percent higher than the national median.

 

MOST POPULAR
11 ACRES ROAD, KELLYVILLE, NSW

This stylish family home combines a classic palette and finishes with a flexible floorplan

35 North Street Windsor

Just 55 minutes from Sydney, make this your creative getaway located in the majestic Hawkesbury region.

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