Cross-laminated timber, or CLT, is touted as a more sustainable option for building construction than concrete and steel. But is it really? The answer is complicated.
CLT is intended to replace concrete and steel whose production accounts for about 13% of global carbon dioxide emissions. Wood in CLT panels pulled CO2 from the atmosphere, and that carbon should remain locked up as long as the building stands.
Some forest scientists, climate modelers, and materials experts question how much of an environmental net gain results from using CLT to replace concrete and steel. Part of the concern relates to choices the lumber industry makes in forestry practices and manufacturing.
Lots of carbon gets dumped into the atmosphere when logs are transformed into CLT, they say. Sawmills and CLT plants typically burn bark, sawdust, and other wood wastes for heat, releasing carbon. Piles of branches, treetops, and smaller trees left behind after a harvest are often burned or left to decompose—releasing carbon into the atmosphere.
When it comes to combating global climate change, the mantra of “wood is good” may be simplistic.
Related Stories
Legislation | May 4, 2022
Washington is first state to mandate all-electric heat for new large buildings
Washington recently became the first state to require all electric heat for new buildings.
Sponsored | Healthcare Facilities | May 3, 2022
Planning for hospital campus access that works for people
This course defines the elements of hospital campus access that are essential to promoting the efficient, stress-free movement of patients, staff, family, and visitors. Campus access elements include signage and wayfinding, parking facilities, transportation demand management, shuttle buses, curb access, valet parking management, roadways, and pedestrian walkways.
Codes and Standards | May 3, 2022
American Institute of Steel Construction updates environmental product declarations
The American Institute of Steel Construction has released updated environmental product declarations (EPDs) “to help designers and building owners design more environmentally friendly buildings and bridges,” according to an AISC news release.
Codes and Standards | May 2, 2022
Developer Hines, engineer MKA develop free embodied carbon reduction guide
Real estate management and investment firm Hines has released the Hines Embodied Carbon Reduction Guide. The free guide, produced with Magnusson Klemencic Associates (MKA), is the result of a two-year effort, relying on MKA’s industry-leading knowledge of carbon accounting and involvement in programs such as the Embodied Carbon in Construction Calculator (EC3) Tool.
Codes and Standards | Apr 28, 2022
Architecture firm Perkins&Will to deliver ‘carbon forecasts’ for clients
Global architecture firm Perkins&Will says it will issue its clients a “carbon forecast” for their projects.
Codes and Standards | Apr 27, 2022
White House guidance on Buy American for infrastructure includes waiver process
Recently released guidance on the Buy American provision within the $1.2 trillion Infrastructure Investment and Jobs Act released by the Office of Management and Budget includes a waiver process.
Multifamily Housing | Apr 26, 2022
Investment firm Blackstone makes $13 billion acquisition in student-housing sector
Blackstone Inc., a New York-based investment firm, has agreed to buy student-housing owner American Campus Communities Inc.
Codes and Standards | Apr 25, 2022
Supply chain constraints, shifting consumer demands adding cost pressures to office fit-outs
Cushman & Wakefield’s 2022 Americas Office Fit-Out Cost Guide found supply chain constraints and shifting consumer demands will continue to add pressure to costs, both in materials and labor.
Legislation | Apr 21, 2022
NIMBYism in the Sunbelt stymies new apartment development
Population growth in Sunbelt metro areas is driving demand for new apartment development, but resistance is growing against these projects.
Codes and Standards | Apr 18, 2022
Dept. of Energy has RFI on funding cost-effective updated energy codes implementation
The U.S. Department of Energy (DOE) Building Technologies Office (BTO) has issued a request for information regarding funding cost-effective implementation of updated building energy codes.
