Volume 41, Issue 10 - October 2006


Unable to Draw Conclusion, AAMA Deflection Limits Task Group Disbands

During the American Architec-tural Manufacturers Associa-tion (AAMA) summer meeting the deflection limits task group passed a motion to end its study activities that were examining the efficacy of a variety of edge-deflection limitation ratios. The group also voted to disband.

“It was their [the task group] feeling that they had completed their initial objective, but the research data presented to date [was] incomplete, inconclusive and more complex than expected,” said Ken Brenden, AAMA codes and industry affairs manager. “The data will be retained by AAMA for future consideration given to this subject.”

The research study began more than two years ago when AAMA contracted consultants Bill Lingnell and Lynn Beason to further examine what could happen if the edge deflection ratio, which historically has been L/175, was altered.

For years L/175 was the de facto industry “benchmark” for determining how much metal is used in a fenestration system. Industry concerns have centered around the ratio of L/175 and whether other ratios could work equally as well or better. The concern by some, though, is that altering the number could result in weaker glass.

“The ramifications of changing [the ratio] could be, ultimately, lightening or decreasing the thickness of glass. In all likelihood that could increase breakage because of the thinner glass,” said one industry source.

In related news from the AAMA summer meeting, a motion passed during a joint meeting of the Architectural
Commercial/Commercial Window Council and Curtainwall/Storefront/ Sloped Glazing Council in support of a recommendation by the deflections limit task group to add L/175 to “C” performance classification products, which are typically used in commercial applications, and that this be the consideration for limits of test pressures at gateway test sizes.

ASC Z97.1 Full Committee Meeting Takes Place in Baltimore

The first full committee meeting of the ASC Z97.1 committee since March 3, 2003, took place August 10 at the Four Points Sheraton Hotel in Baltimore. The group discussed the next stages and future progressions for the ANSI Z97.1 standard (see related article in the December 2004 USGlass, page 20).

One matter of focus during the meeting revolved around a new format and publication mechanism for the standard.

In addition, four task groups were developed to focus on different issues concerning the standard. The task groups are:

  • Testing requirements and acceptance criteria, chaired by Greg Carney of the Glass Association of North America (GANA), will update and enhance testing requirements and acceptance criteria of the standard;
  • Scope, chaired by Valerie Block of DuPont, will review and establish the purpose and limitations of the standard;
  • Label information, chaired by Rick Wright of Oldcastle Glass, will review and update existing labeling requirements of the standard; and
  • Reference standards, chaired by Liz Grimes of Arkema, will review and update existing reference standards. 
    A call for task group members was sent out, and each group was to have had at least one teleconference by mid-October.

ANSI Z97.1’s inclusion in building codes was also discussed as new business. The group is hoping to see ANSI Z97.1 included once again in building codes, but to do so needs an authorized representative who can stand up in support of Glazing Industry Code Committee (GICC) code proposals that request its inclusion. A motion was passed that elected Tom Zaremba of Pilkington plc and/or GANA’s Carney to stand in support of GICC code proposals before the code bodies to ask that ANSI Z97.1-2004 be substituted for CPSC 16 CFR 1201 in non-pre-empted areas.

The next ASC Z97.1 meeting will take place March 21-22, 2007 in Baltimore.

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