digital edition


A Material Issue

USGBC's proposed credit changes focus on life cycle assessment.

By Nadav Malin
September 01, 2012

It can take between 20 and 80 years for the impacts of a building's operation to catch up with the impacts of its initial construction: For the first few decades of a building's life most of its environmental footprint is from the materials used to make it. That insight is behind the effort to reinvent the materials credits in the next version of LEED, according to Scot Horst, SVP for LEED at the U.S. Green Building Council.

----- Advertising -----

The proposed LEED v4 rating includes points for using environmental life-cycle assessment (LCA) to reduce the environmental burdens of a building's structure and shell. That approach should encourage techniques to optimize material quantities, says Horst.

LCA is also at the heart of a new credit called Material Disclosure and Optimization, encouraging the use of products with Environmental Product Declarations (EPDs), which are independently verified summaries of LCA studies. LEED v4 also includes separate credits dealing with human and ecological health hazards and habitat disruption.

The proposed changes are highly controversial. Major trade associations, led by the American Chemistry Council, object to the new disclosure and avoidance requirements, calling them unscientific and biased. These groups are using their political muscle to undermine government support for LEED.

Building professionals don't necessarily disagree with the direction of the new credits, but are wary of changing the system so radically all at once, and concerned that tools and resources needed to meet the new credits are not yet available. In response to these latter concerns, the USGBC has delayed the launch of the new system from 2012 to 2013, and promised that the previous system would remain available as an option until 2015.


 Reader Comments:

Sign in to Comment

To write a comment about this story, please sign in. If this is your first time commenting on this site, you will be required to fill out a brief registration form. Your public username will be the beginning of the email address that you enter into the form (everything before the @ symbol). Other than that, none of the information that you enter will be publically displayed.

We welcome comments from all points of view. Off-topic or abusive comments, however, will be removed at the editors’ discretion.
----- Advertising -----
Click here to go to product info Page
Daily Headlines
Sweets, Search Building Products
Reader Feedback
Most Commented Most Recommended
Rankings reflect comments made in the past 14 days
Rankings reflect comments made in the past 14 days
Recently Posted Reader Photos

View all photo galleries >>
Recent Forum Discussions

View all forum discusions >>