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
| Feb 8, 2012
OSHA offers free health and safety consulting for small businesses
The consultants offer confidential, non-punitive advice.
| Feb 8, 2012
Controversy over pay for prisoners on roofing job in Michigan
The disagreement was over whether the prisoners should have been paid prevailing wage for their brief time on the job because the project was paid for with a U.S. Department of Energy grant.
| Jan 30, 2012
ZigBee and ISO 50001: Two new standards to make buildings greener
These developments demonstrate the dynamic nature of the market and the continued need for development of program standards of many different types that help builders and owners translate high performance and sustainable buildings goals into practical measures on the ground.
| Jan 30, 2012
New firm-fixed-price rules on federal contracts impact construction industry
Contractors will need to be on the lookout for policies such as the Contractor Accountability for Quality clause.
| Jan 30, 2012
Roofer’s fatal plunge demonstrates need for fall-prevention regulations
“The biggest problem is getting our workers to use the equipment,” says Michael J. Florio, executive director of the organization.
| Jan 26, 2012
Tampa moves to streamlined online permitting system
The system will replace an inefficient patchwork of old software and is designed to provide businesses, homeowners, and contractors with online access to permitting and licensing information.
| Jan 26, 2012
EPA to collect more data, seek comments before finalizing mud rule
The EPA says it will seek more data and is accepting comments until March 5.
| Jan 26, 2012
Industry challenges Connecticut's suit over defective construction work
The dispute arose over multimillion-dollar leaks at the University of Connecticut's law library.
