Codes Regulations  
ICC Approves Structural and Energy  
Glazing-Related Proposals  
016 Committee Action Hearings,  
which took place April 17-27 in  
Louisville,Ky.,included a number glazing  
and fenestration-related proposals that  
were approved.  
Some of the changes related to the  
structural section of the International  
Building Code (IBC). These included  
S69-16, which addresses IBC 1604—a  
code covering deflection limits of roof-  
ing. With the change, the deflection of  
framing members supporting glass  
subjected to 0.6 times the “component  
and cladding” windloads now cannot  
exceed the following:  
1/175 of the length of span of the fram-  
ing a length not more than 13 feet 6  
inches; or,  
During the most recent ICC code hearings, a number of glazing related  
1/240 of the length of span of the fram- proposals were covered, addressing topics such as structural and energy-  
ing member plus 1/4 inch, for framing performance requirements.  
members having a length greater than  
3 feet 6 inches.  
S150,which was also approved.Accord- sion of the 2016 edition of ASCE 7 Min-  
“This proposal establishes the appro- ing to Jeff Inks of WDMA,it is intended imum Design Loads and Associated  
priate deflection limit for exterior wall “to clarify that the use of the 0.6 con- Criteria for Buildings and Other Struc-  
framing members that are supporting version multiplier is allowed with re- tures (ASCE 7-16). The changes pro-  
glass,” said Julie Ruth, representing the spect to the determination of design posed in all sections are designed to  
American Architectural Manufacturers wind pressures in accordance with harmonize terminology between the  
Association (AAMA). “It is based upon ASCE 7 and testing of the respective as- code and the loading standard.  
criteriagiveninAAMATIR-11,Maximum semblies in accordance with Sections  
“The design wind speed maps have  
been updated to reflect the maps adopted  
He continued,“While that is what the into ASCE 7-16. During the development  
Allowable Deflection of Framing Systems 1709.5.1 and 1709.5.2, accordingly.”  
for Building Cladding Components at De-  
sign Wind Loads.This criterion has been existing provision allows, as currently of the ASCE 7-16 standard, the ASCE 7  
used successfully by the fenestration in- written, that is not entirely clear and WindLoadSubcommitteemadesubstan-  
dustry for decades.  
has led to confusion regarding wind- tial revisions to the wind speed maps con-  
“For designers and contractors who are load requirements. This proposed tained within the standard, and the  
notfollowinggoodpractices,theremaybe amendment expressly states that the numberof mapswentfromthreetoeight,”  
additional cost associated with the verti- use of the 0.6 multiplier is allowed and said proponent Jennifer Goupil of the  
cal framing members that are supporting will alleviate the confusion that cur- American Society of Civil Engineers.  
glass,”Ruth said.“This is a relatively small rently exists, benefiting all—code offi- “These revisions include the development  
portion of the overall cost of an exterior cials, manufacturers and builders.”  
of separate maps for Risk Categories III  
curtainwall system.” Also, S56-16 was approved as modi- and IV structures; reconstruction of the  
The Window and Door Manufactur- fied. This coordination proposal brings specialwindregionswithinthemaps,cor-  
ers Association (WDMA) proposed the 2018 IBC up to date with the provi- recting known deficiencies in the wind  
USGlass, Metal & Glazing | June 2016  
Fire and Nice.  
Fire-Rated Aluminum  
Window And Door  
For the most efficient,  
speed contours; and modification of the solar heat gain coefficient (SHGC) from  
basic wind speed based on updated cli- 0.40 to 0.36 in climate zone 4 and 0.38  
least labor-intensive  
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windows and glazed wall  
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matic and weather data.”  
New hurricane contours in the north- ASHRAE 90.1-2016.  
eastern states were also developed based  
on updated hurricane models,and the lo- disapproval of CE42, which would have  
cations of the contours along the hurri- lowered the SHGC to 0.25 all the way up to  
cane coast line were adjusted to reflect zone 6,including places like Minneapolis.  
new research into the decay rate of hurri- “This proposal has been defeated several  
in zone 5 to match what will be in  
That change followed the unanimous  
canes over land,Goupil said.  
New maps for the state of Hawaii  
times before,”said Culp.  
Also approved by a 12-0 margin was  
were developed to eliminate it as a spe- CE286, which corrects language that  
cial wind region and to provide guid- woulddiscouragewindowreplacementor  
ance on the wind patterns for the state other upgrades in existing buildings that  
that occur because of the unique to- alreadyhavefenestrationandskylightarea  
120 minutes, you’ll see  
why we’ve become the  
favorite of architects and  
installers alike.  
pography there,” she said.  
over the prescriptive limit.  
Likewise,RE146 sets the baseline win-  
EnC4e0r2g.4y.1P.2e,wrhfoichrmincarneacseed skylight dow area at 15 percent, and keeps the  
same penalty for window areas above 15  
area from five to six percent when day- percent.It now also gives a credit for low-  
lighting controls are used, was among ering window area below 15 percent.  
those in the International Energy Con-  
“This gives an incentive to reduce win-  
servation Code (IECC). This change dow area, which the window industry is  
aligns the IECC code percentage with obviously concerned about,”said Culp.“In  
ASHRAE 90.1.  
Otherindustry-relatedclarificationsin- too drastically … as homeowners want  
cluded alterations to CE72-16, which in- windows and no one wants to live in a  
volves U-, C- and F-factors of building cave, but this incentive could cause de-  
envelopes. Proponents lobbied for a signers to take out a window here and  
change to fix an“editorial oversight.”  
Tom Culp,who represented the Glazing  
there,and that’s a concern.”  
Two other industry-related proposals,  
Industry Code Committee (GICC), said RE156 and RE134,were also approved.  
Table C402.4 was omitted in the previous Both set a “backstop” on the envelope,  
wording,andtheproposalalsohadastate- giving the flexibility to make changes in  
ment added “to make it clear that fenes- the traditional performance path or new  
tration must still meet the applicable energy rating index path but also affirm-  
SHGC requirements.”  
ing that the envelope can only be traded  
Additionally, the document now refer- off so much.  
ences C402.1.5 in the alterations section  
“This backstop says even if you exceed  
to refer to specific values in the envelope theenergyperformanceinotherareaslike  
performancealternative.Editorialchanges high-efficiency equipment, use of solar  
to the language in skylight codes were up- panels, better lighting, etc., the envelope  
datedfornewskylightsreplacingoldones. stillhastobewithin15percentof thetotal  
Also part of the IECC,CE94,proposed area-weighted average of the 2018 pre-  
by GICC,made moderate changes to the scriptive levels. s  
Aluflam USA  
Phone 562-926-9520 | Fax 562-404-1394  
June 2016 | USGlass, Metal & Glazing