Licensed Architect - Summer 2017 - 18

Continuing Education
fenestration product. There are
minimum performance grades,
design pressures and water
penetration resistance test pressures
for all performance classes.
Each class also includes optional
performance grades increasing in
five PSF increments. In some cases,
the appropriate level of performance
classification does not correspond
with the general use of the building,
or the use group occupancy assigned
to the building in accordance with the
local building code.
For example, certain residential
building applications require CW
and/or AW performance class
fenestration products. Whereas
some commercial building
applications has successfully been
able to use R and/or LC performance
class fenestration products.

The following descriptions
help determine which
class is best suited to a
particular application.
R - commonly used in one and two
family dwellings

LC - commonly used in low-rise

and mid-rise multi-family dwellings
and other buildings where larger sizes
and higher loading requirements are
expected

CW - commonly used in low-rise

and mid-rise buildings where larger
sizes, higher loading requirements,
limits on deflection and heavy use are
expected

AW - commonly used in high-rise

and mid-rise buildings to meet increased
loading requirements, and limited on
deflection and buildings where frequent
and extreme use of the fenestration
products is expected

18 | Licensed Architect | Summer 2017

It is important to specify window, door
and skylight products to the NAFS
standard to ensure the complete
standard is being met. In an effort to
facilitate this process, the standard
includes a Short Form Specification
in clause 0.3 of the standard. To
complete the form, the specification
writer shall insert the product type as
Performance Class and Performance
Grade (PG) for the product desired
by specification designation such
as R-PG15-HS for horizontal sliding
windows or AW- PG40-AP for
projected windows.
Model Building Codes
The model building codes reference
specific fenestration industry standards
and a product's manufacturer is
required to test and provide proof of
performance to the requirements of
the model codes reference standards.
The building code requirements for
windows, doors and skylights include
the wind design criteria (International
Building Code section 2015 IRC
R301.2.1) or structural wind load
requirements. The building code also
requires protection of openings by
impact resistance to windborne debris
in coastal regions susceptible to
hurricanes and includes specifics on
fenestration testing and labeling.
Buildings shall be constructed in
accordance with the wind provisions
of this code using the ultimate design
wind speed in Table R301.2(1) as
determined from Figure R301.2(4)
A. The structural provisions of this
code for wind loads are not permitted
where wind design is required as
specified in Section R301.2.1.1. Where
different construction methods and
structural materials are used for various
portions of a building, the applicable
requirements of this section for
each portion shall apply. Where not
otherwise specified, the wind loads
listed in Table R301.2(2) adjusted
for height and exposure using Table
R301.2(3) shall be used to determine
design load performance requirements
for wall coverings, curtain walls, roof
coverings, exterior windows, skylights,

"In some cases, the
appropriate level
of performance
classification does
not correspond with
the general use of
the building, or the
use group occupancy
assigned to the building
in accordance with the
local building code."
garage doors and exterior doors. The
building code IRC -R301.2.1.2 addresses
the protection of openings.
This requires that the exterior glazing
in buildings located in windborne
debris regions shall be protected from
windborne debris. Glazed opening
protection for windborne debris shall
meet the requirements of the Large
Missile Test of ASTM E 1996 and ASTME
1886 as modified in Section 301.2.1.2.1.
The Residential Energy Performance
requirements are covered in the code
section R402.3 on fenestration. In
addition to the requirements of Section
R402, fenestration shall comply with
Sections R402.3.1 through R402.3.6.
Windows, sliding glass doors and
skylights shall have an air infiltration
rate of no more than 0.3 cfm per square
foot (1.5 L/s/m2), and swinging doors
no more than 0.5 cfm per square foot
(2.6 L/s/m2), when tested according
to NFRC 400 or AAMA/WDMA/CSA
101/I.S.2/A440 by an accredited,
independent laboratory and listed and
labeled by the manufacturer.
The ICC residential building code,
Section R612.6, addresses testing
and labeling to the design criteria
and related window and glass door
testing requirements. A label from
a certification agency is the most
straightforward method to prove
compliance. The certification agency
issues certification documentation and



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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