Glazing Industry Groups Win Their Appeal
of ASHRAE 90.1-2010
The glazing industry successfully
overturned new, “unnecessarily restrictive” glazing provisions from taking
effect this month as a part of ASHRAE 90.1-2010’s prescriptive path for
code compliance (see November 2009 USGlass, page 14, for related article).
In a joint statement issued by the Glass Association of North America
(GANA), the Aluminum Extruders Council (AEC), the Insulating Glass Manufacturers
Alliance (IGMA), AGC Flat Glass North America Inc., Guardian Industries
Corp. and Pilkington North America Inc., the group states that an ASHRAE
appeals panel reversed a decision by ASHRAE’s Standing Standard Project
Committee 90.1 to reduce the amount of glass permissible in the envelope
of commercial buildings using the prescriptive path by a full 25 percent—from
a maximum window-to-wall ratio of 40 percent to a maximum of 30 percent.
It also reversed the proposed inclusion of more restrictive U-factors
and solar heat gain coefficient (SHGC) values and the addition of a new
minimum for VT/SHGC (of 1.1) in ASHRAE 90.1’s prescriptive path.
Appeals were taken on behalf of the glazing industry on the grounds that:
1) The Project Committee’s decisions were technically flawed since they
lacked sound estimates of likely energy saving; and
2) The process used by the Project Committee violated ASHRAE and ANSI
procedures since the glazing industry was not provided adequate representation
on either the Committee or its Envelope Subcommittee.
In its decision, the Appeals Panel held that “Addendum bb to ANSI/ASHRAE/
IESNA Standard 90.1-2007 will be returned to the Project Committee to
address the portions of this appeal that were upheld [respecting U-factor,
SHGC, VT/SHGC and WWR]. The Project Committee will determine what changes,
if any, will be made, and addendum bb, or portions thereof, would need
to go through the public review process again.”
Members of the glazing industry have been actively involved in the process
leading to the change since last fall when concerns first arose regarding
the ASHRAE proposal.
“It has been a real challenge trying to educate the ASHRAE committee about
modern glazing technology, and the important role glazing can play in
high-performance buildings,” says Thomas Culp Ph.D. of Birch Point Consulting,
an industry consultant who has been involved with this effort from the
beginning. “Many seemed to still hold onto 1980s perceptions about glass,
and incorrect attitudes that ‘windows are only poor walls,’ without considering
the benefits of daylighting and views. We have started to change these
attitudes, as shown by our success with the appeal panel, but it will
be a continued process.”
Culp says the unity of the industry was a key factor in this recent success.
“Unfortunately, our industry has a history of fighting itself in the code
arenas, so it was powerful when all the associations and companies came
together to present a united front. Also, I believe the committee overstepped
itself under the pressure of its goal to increase the stringency of the
standard by 30 percent, and we were able to show they did not have the
proper technical justification for their proposals.”
success of our appeal clearly demonstrates that ASHRAE
supports changes that are justified…"
—Margaret Webb, IGMA
“I am extremely pleased with the decision.
The glazing industry strongly supports ASHRAE’s efforts to improve energy
efficiency in commercial buildings, but all improvements need to be based
on sound technical analysis,” says Bill Yanek, executive vice president
of GANA. “As major stakeholders, the glazing industry also needs to be
part of the process throughout. This is a major step forward.”
Margaret Webb, IGMA executive director, adds, “Joint efforts and leadership
provided by Dr. Tom Culp, Urmilla Sowell (GANA technical director) and
others representing the industry, were based on well documented facts.
The success of our appeal clearly demonstrates that ASHRAE supports changes
that are justified, which has always been the cornerstone of the organization.”
The industry had filed two coordinated appeals, one by Thomas S. Zaremba
of Roetzel & Andress on behalf of Pilkington North America Inc. and
AGC Flat Glass North America Inc., and the other filed jointly by GANA,
AEC, IGMA and Guardian Industries Corp. with Culp and Sowell leading the
Culp had recently been appointed to voting membership on the ASHRAE 90.1
Committee and its Envelope Subcommittee, and Sowell had been appointed
as a consultant to the Envelope Subcommittee. Culp and Sowell, representing
AEC and GANA, say they will continue to advocate for the commercial glazing
industry at ASHRAE as the Project Committee and its Envelope Subcommittee
revisit the commercial glazing issues specified by the appellate panel.
Culp says the 2010 version of ASHRAE 90.1 will be published without the
proposed reduction in glazing area, new VT/SHGC requirement or revised
U-factor and SHGC criteria. In the mean time, addendum bb will be sent
back to the committee.
“We will stay actively engaged with ASHRAE during this process to help
them achieve their goals of increased energy efficiency, while also ensuring
all proposed requirements are properly justified and reflective of the
benefits of modern glazing,” Culp says.
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