to Make AAMA 507 an Alternative to NFRC Rating Defeated
The National Fenestration Rating Council (NFRC) and the glazing
industry sparred again, metaphorically speaking, at the International
Code Council (ICC) hearings, and NFRC was the winner. The hearings
started February 18 in Palm Springs, Calif., and will go through
The proposed change before the group, EC4-07/08, was introduced
by five industry personnel, including Margaret Webb of the Insulating
Glass Manufacturers Alliance (IGMA) and Greg Carney of the Glass
Association of North America (GANA). Their proposed changes began
with section 102.1.3 on fenestration product ratings, where they
wanted to see the text referencing specific group code and charts
deleted and in its stead simply have the section reference individual
subsections where the meat of the group code is addressed.
Subsequently, the group-of which Craig Conner with Building Quality,
Julie Ruth of JRuth Code Consulting (representing the American Architectural
Manufacturers Association [AAMA]) and Rand Baldwin for the Aluminum
Extruders Council are also partproposed the addition of these
188.8.131.52 Fenestration rating by NFRC [National Fenestration
Rating Council] 100 and NFRC 200. Determination of U-Factors
for fenestration products shall be in accordance with NFRC 100
by an accredited, independent laboratory, and the products shall
be labeled and certified by the manufacturer. Determination of
the [solar heat gain coefficient] SHGC of glazed fenestration
products shall be in accordance with NFRC 200 by an accredited,
independent laboratory, and the products shall be labeled and
certified by the manufacturer.
184.108.40.206 Commercial fenestration alternative rating by
AAMA 507. U-factors and SHGC for fenestration used in commercial
buildings shall be determined in accordance with AAMA 507. The
product performance shall be documented by a certificate of compliance,
as described in AAMA 507, that is signed and submitted to the
code official by the glazing contractor or registered design professional.
The product line testing and simulation, as described in AAMA
507, shall be conducted in accordance with NFRC 100 and NFRC 200
by an approved, accredited, independent laboratory.
220.127.116.11 Default values for fenestration rating. Products
lacking a U-factor determined in accordance with Section 18.104.22.168
or 22.214.171.124 shall be assigned a default U-factor from Table 102.1.3(1)
or 102.1.3(2). Products lacking an SHGC determined in accordance
with Section 126.96.36.199 or 188.8.131.52 shall be assigned a default
SHGC from Table 102.1.3(3).
They proposed the addition of curtainwall and storefront glazing
to the definition of fenestration as used in Section 202's general
definitions and would like to see the addition of an AAMA standard
(507-07, "Standard Practice for Determining the Thermal Performance
Characteristics of Fenestration Systems Installed in Commercial
Buildings") to Chapter 6.
Connor provided the first written reason for the group's proposal:
"The reason for this change is simple. Commercial windows should
be rated for energy-efficiency. The industry needs a rating method
that works with their bid and construction process. The time between
bid and construction can be days or weeks. The NFRC website states,
'It will take on average approximately 100 days to obtain a Label
Certificate.' The AAMA 507 procedure can be used to rate a window
within a few days or less and produces the same rating."
Ruth added that "[this] proposal would permit the use of AAMA 507
to determine the U-factor and SHGC of glazed assemblies in commercial
buildings … We urge the committee to recognize this method in the
IECC to provide architects and contractors an accurate way to determine
the U-factors and SHGC of a proposed glazing system that fits within
the fast track time frame of commercial construction."
The proposal was defeated by 10 to 4 after two modifications to
it were approved. These modifications said that the proposal only
applied to curtainwall and storefronts and that the glazing contractor
could not supply the certificate of compliance; it could be done
only by a design professional.
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