News Analysis

Glazing Industry Fights Tightened Energy Standards

Several glazing industry associations successfully appealed changes to ASHRAE Standard 90.1 that would have reduced the amount of glass allowed in commercial building envelopes. The change would have reduced the maximum window-to-wall ratio from 40% to 30% and tightened the maximum U-factor and solar heat gain coefficient. A minimum for visual light transmittance was also added to the standard’s prescriptive path. The standard is being returned to committee so the glazing changes can be reconsidered.

The glass industry appealed what it called the “unnecessarily restrictive” glazing provisions in Standard 90.1 based on two things: first, industry groups claimed that the new provisions were not based on sound research on energy savings; second, the glazing industry felt it lacked sufficient representation on the committee that made the changes. The chair of the 90.1 committee, Mick Schwedler, said that he looks forward to opening the committee to broader representation. “Our goals are to make sure the standard reflects the energy-efficient glazing practices and technology, and to reach consensus,” he told EBN.

Published November 9, 2010

Wendt, A. (2010, November 9). Glazing Industry Fights Tightened Energy Standards. Retrieved from