Licensed Architect - Summer 2017 - 19

authorizes the product's manufacturer
to label their product in accordance
with the code requirements.
Energy Performance Ratings
The NFRC ratings address the energy
flow through products and rates
the heat transfer, solar heat gain as
well as visible light transmittance
and air infiltration as depicted in the
visual illustration. There are several
factors that go into the energy
performance of fenestration products.
The most apparent property for the
thermodynamics of a system is the
temperature driven heat transfer
measured as a U-factor. Keep in mind
that solar heat gain and air infiltration
are additional ratings which are also
requirements of the building code. The
NFRC label clearly identifies the NFRC
as the certifying agency as well as the
manufacturer and product description
and product ratings. Air infiltration is
an optional rating for NFRC and is a
requirement of compliance with the
NAFS standard.

R405 shall be 0.48 in Climate Zones
4 and 5 and 0.40 in Climate Zones
6 through 8 for vertical fenestration,
and 0.75 in Climate Zones 4 through
8 for skylights. The area-weighted
average maximum fenestration SHGC
permitted using tradeoffs from Section
R405 in Climate Zones 1 through 3
shall be 0.50.

In order to determine the performance
path value, you can always consult
the default tables or use the energy
performance path method. The energy
performance path method is identified
in section 303.1.3 of the code and
the U-factor must be determined by
use of the NFRC 100 through and
independent laboratory. The products
must be labeled and products lacking
a label will be assigned a default
U-factor.

For more information, go to
www.wdma.com

The model codes also address the
area-weighted average maximum
fenestration U-factor permitted using
tradeoffs from Section R402.1.4 or

Please contact WDMA with any
questions related to the information
presented in this program.

Resources:
Building Codes
International Code Council: ICC Safe
http://www.iccsafe.org/Standards
NAFS: WDMA Online Bookstore
https://wdma.site-ym.com/store/
ViewProduct.aspx?id=1909917
WDMA Hallmark Certification
www.wdma.com/WDMAHallmark
NFRC - National Fenestration Rating Council
www.nfrc.org
American Society of Testing and Materials
http://www.astm.org
Certification Accreditation - ANSI
http://ansi.org/accreditation/default.aspx

COURTESY OF NFRC WWW.NFRC.ORG.

The fenestration energy requirements
in the building code include a general,
prescriptive path, with default tables

as well as performance path. The
prescriptive path is identified in section
402.1 of the code for component
effectiveness in a thermal envelope. The
fenestration prescriptive performances
from table 402.1.1 state the maximum
U-Factor of 0.65 and Maximum SHGC
of 0.30 a maximum U-Factor exception
is allowed for impact rated fenestration
to be 0.75. However, if the window area
as a percentage of floor area exceeds
20 percent, the performance path must
be used.

Summer 2017 | Licensed Architect | 19


http://www.wdma.com http://www.iccsafe.org/Standards https://wdma.site-ym.com/store/ http://www.wdma.com/WDMAHallmark http://www.nfrc.org http://www.astm.org http://www.ansi.org/accreditation/default.aspx http://WWW.NFRC.ORG

Table of Contents for the Digital Edition of Licensed Architect - Summer 2017

President’s Message
ADA Advice Accessibility: Handrail Details for Stairways and Ramps
Continuing Education A Review of Window, Door and Skylight Standards and Certification
Buyer’s Guide
Feature Article The Necessary Accessory: Hardware
Continuing Education Providers/ ALA New Members
Insurance Design Professionals and Cyber Risk - Part 2
Second Chances for Buildings The New Roof is Still Leaking?
Feature Article What Do Clients Want? Amenities, style and function
Firm Management Tools for Small Firms: Time Management
Index of Advertisers
Licensed Architect - Summer 2017 - Intro
Licensed Architect - Summer 2017 - cover1
Licensed Architect - Summer 2017 - cover2
Licensed Architect - Summer 2017 - 3
Licensed Architect - Summer 2017 - 4
Licensed Architect - Summer 2017 - 5
Licensed Architect - Summer 2017 - President’s Message
Licensed Architect - Summer 2017 - 7
Licensed Architect - Summer 2017 - ADA Advice Accessibility: Handrail Details for Stairways and Ramps
Licensed Architect - Summer 2017 - 9
Licensed Architect - Summer 2017 - 10
Licensed Architect - Summer 2017 - 11
Licensed Architect - Summer 2017 - 12
Licensed Architect - Summer 2017 - 13
Licensed Architect - Summer 2017 - 14
Licensed Architect - Summer 2017 - 15
Licensed Architect - Summer 2017 - Continuing Education A Review of Window, Door and Skylight Standards and Certification
Licensed Architect - Summer 2017 - 17
Licensed Architect - Summer 2017 - 18
Licensed Architect - Summer 2017 - 19
Licensed Architect - Summer 2017 - 20
Licensed Architect - Summer 2017 - Buyer’s Guide
Licensed Architect - Summer 2017 - 22
Licensed Architect - Summer 2017 - 23
Licensed Architect - Summer 2017 - 24
Licensed Architect - Summer 2017 - Feature Article The Necessary Accessory: Hardware
Licensed Architect - Summer 2017 - Continuing Education Providers/ ALA New Members
Licensed Architect - Summer 2017 - Insurance Design Professionals and Cyber Risk - Part 2
Licensed Architect - Summer 2017 - 28
Licensed Architect - Summer 2017 - 29
Licensed Architect - Summer 2017 - Second Chances for Buildings The New Roof is Still Leaking?
Licensed Architect - Summer 2017 - 31
Licensed Architect - Summer 2017 - 32
Licensed Architect - Summer 2017 - Feature Article What Do Clients Want? Amenities, style and function
Licensed Architect - Summer 2017 - 34
Licensed Architect - Summer 2017 - 35
Licensed Architect - Summer 2017 - Firm Management Tools for Small Firms: Time Management
Licensed Architect - Summer 2017 - 37
Licensed Architect - Summer 2017 - Index of Advertisers
Licensed Architect - Summer 2017 - cover3
Licensed Architect - Summer 2017 - cover4
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