Page 55 - 2018_IRC

BUILDING PLANNING

2. For structural insulated panels, the wind provi- translucent or transparent plastic or glass. The
sions of this code shall apply in accordance sunroom fenestration complies with additional
with the limitations of Section R610. requirements for air infiltration resistance and
water penetration resistance. The space is non-
3. For cold-formed steel light-frame construc-
tion, the wind provisions of this code shall habitable and unconditioned.
apply in accordance with the limitations of Category IV: A thermally isolated sunroom with
Sections R505, R603 and R804. enclosed walls. The sunroom is designed to be
In regions where wind design is required in accor- heated or cooled by a separate temperature con-
dance with Figure R301.2(5)B, the design of buildings trol or system and is thermally isolated from the
primary structure. The sunroom fenestration
for wind loads shall be in accordance with one or more
of the following methods: complies with additional requirements for water
penetration resistance, air infiltration resistance
1. AWC Wood Frame Construction Manual and thermal performance. The space is nonhabit-
(WFCM). able and conditioned.
2. ICC Standard for Residential Construction in Category V: A sunroom with enclosed walls.
High-Wind Regions (ICC 600). The sunroom is designed to be heated or cooled
3. ASCE Minimum Design Loads for Buildings and and is open to the main structure. The sunroom
Other Structures (ASCE 7). fenestration complies with additional require-
ments for water penetration resistance, air infil-
4. AISI Standard for Cold-Formed Steel Framing— tration resistance and thermal performance. The
Prescriptive Method For One- and Two-Family space is habitable and conditioned.
Dwellings (AISI S230).
R301.2.1.2 Protection of openings. Exterior glazing in
5. International Building Code.
buildings located in windborne debris regions shall be
The elements of design not addressed by the meth- protected from windborne debris. Glazed opening pro-
ods in Items 1 through 5 shall be in accordance with the tection for windborne debris shall meet the requirements
provisions of this code. of the Large Missile Test of ASTM E1996 and ASTM
Where ASCE 7 or the International Building Code is E1886 as modified in Section 301.2.1.2.1. Garage door
used for the design of the building, the wind speed map glazed opening protection for windborne debris shall
and exposure category requirements as specified in meet the requirements of an approved impact-resisting
ASCE 7 and the International Building Code shall be standard or ANSI/DASMA 115.
used. Exception: Wood structural panels with a thickness
7
R301.2.1.1.1 Sunrooms. Sunrooms shall comply of not less than / inch (11 mm) and a span of not
16
with AAMA/NPEA/NSA 2100. For the purpose of more than 8 feet (2438 mm) shall be permitted for
applying the criteria of AAMA/NPEA/NSA 2100 opening protection. Panels shall be precut and
based on the intended use, sunrooms shall be identi- attached to the framing surrounding the opening
fied as one of the following categories by the permit containing the product with the glazed opening. Pan-
applicant, design professional or the property owner els shall be predrilled as required for the anchorage
or owner’s agent in the construction documents. method and shall be secured with the attachment
Component and cladding pressures shall be used for hardware provided. Attachments shall be designed
the design of elements that do not qualify as main to resist the component and cladding loads deter-
windforce-resisting systems. Main windforce-resist- mined in accordance with either Table R301.2(2) or
ing system pressures shall be used for the design of ASCE 7, with the permanent corrosion-resistant
elements assigned to provide support and stability attachment hardware provided and anchors perma-
for the overall sunroom. nently installed on the building. Attachment in
accordance with Table R301.2.1.2 is permitted for
Category I: A thermally isolated sunroom with buildings with a mean roof height of 45 feet (13 728
walls that are open or enclosed with insect mm) or less where the ultimate design wind speed,
screening or 0.5 mm (20 mil) maximum thick- V , is 180 mph (290 kph) or less.
ness plastic film. The space is nonhabitable and ult
unconditioned. R301.2.1.2.1 Application of ASTM E1996. The
Category II: A thermally isolated sunroom with text of Section 2.2 of ASTM E1996 shall be substi-
tuted as follows:
enclosed walls. The openings are enclosed with
translucent or transparent plastic or glass. The 2.2 ASCE Standard:
space is nonhabitable and unconditioned. ASCE 7-10 American Society of Civil Engineers
Category III: A thermally isolated sunroom with Minimum Design Loads for Buildings and Other
enclosed walls. The openings are enclosed with Structures

30 2018 INTERNATIONAL RESIDENTIAL CODE ®
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