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PLASTIC

2603.9 Special approval. Foam plastic shall not be required ments of Sections 2603.12.1 and 2603.12.2, or an approved
to comply with the requirements of Section 2603.4 or those of design for support of cladding weight.
Section 2603.6 where specifically approved based on large- Exceptions:
scale tests such as, but not limited to, NFPA 286 (with the 1. Where the cladding manufacturer has provided
acceptance criteria of Section 803.1.1.1), FM 4880, UL 1040 approved installation instructions for application
or UL 1715. Such testing shall be related to the actual end-use over foam sheathing, those requirements shall apply.
configuration and be performed on the finished manufactured
foam plastic assembly in the maximum thickness intended for 2. For exterior insulation and finish systems, refer to
use. Foam plastics that are used as interior finish on the basis Section 1407.
of special tests shall conform to the flame spread and smoke- 3. For anchored masonry or stone veneer installed over
developed requirements of Chapter 8. Assemblies tested shall foam sheathing, refer to Section 1404.
include seams, joints and other typical details used in the 2603.12.1 Direct attachment. Where cladding is installed
installation of the assembly and shall be tested in the manner directly over foam sheathing without the use of furring,
intended for use. cladding minimum fastening requirements to support the
2603.10 Wind resistance. Foam plastic insulation complying cladding weight shall be as specified in Table 2603.12.1.
with ASTM C578 and ASTM C1289 and used as exterior 2603.12.2 Furred cladding attachment. Where steel or
wall sheathing on framed wall assemblies shall comply with wood furring is used to attach cladding over foam sheath-
ANSI/FS 100 for wind pressure resistance. ing, furring minimum fastening requirements to support
2603.11 Cladding attachment over foam sheathing to the cladding weight shall be as specified in Table
masonry or concrete wall construction. Cladding shall be 2603.12.2. Where placed horizontally, wood furring shall
specified and installed in accordance with Chapter 14 and the be preservative-treated wood in accordance with Section
cladding manufacturer’s installation instructions or an 2303.1.9 or naturally durable wood and fasteners shall be
approved design. Foam sheathing shall be attached to corrosion resistant in accordance Section 2304.10.5. Steel
masonry or concrete construction in accordance with the furring shall have a minimum G60 galvanized coating.
insulation manufacturer’s installation instructions or an 2603.13 Cladding attachment over foam sheathing to
approved design. Furring and furring attachments through wood framing. Cladding shall be specified and installed in
foam sheathing shall be designed to resist design loads deter- accordance with Chapter 14 and the cladding manufacturer’s
mined in accordance with Chapter 16, including support of installation instructions. Where used, furring and furring
cladding weight as applicable. Fasteners used to attach clad- attachments shall be designed to resist design loads deter-
ding or furring through foam sheathing to masonry or con- mined in accordance with Chapter 16. In addition, the clad-
crete substrates shall be approved for application into ding or furring attachments through foam sheathing to
masonry or concrete material and shall be installed in accor- framing shall meet or exceed the minimum fastening require-
dance with the fastener manufacturer’s installation instruc- ments of Section 2603.13.1 or 2603.13.2, or an approved
tions. design for support of cladding weight.
Exceptions: Exceptions:
1. Where the cladding manufacturer has provided 1. Where the cladding manufacturer has provided
approved installation instructions for application approved installation instructions for application
over foam sheathing and connection to a masonry or over foam sheathing, those requirements shall apply.
concrete substrate, those requirements shall apply. 2. For exterior insulation and finish systems, refer to
2. For exterior insulation and finish systems, refer to Section 1407.
Section 1407. 3. For anchored masonry or stone veneer installed over
3. For anchored masonry or stone veneer installed over foam sheathing, refer to Section 1404.
foam sheathing, refer to Section 1404.
2603.13.1 Direct attachment. Where cladding is installed
2603.12 Cladding attachment over foam sheathing to directly over foam sheathing without the use of furring,
cold-formed steel framing. Cladding shall be specified and minimum fastening requirements to support the cladding
installed in accordance with Chapter 14 and the cladding weight shall be as specified in Table 2603.13.1.
manufacturer’s approved installation instructions, including 2603.13.2 Furred cladding attachment. Where wood
any limitations for use over foam plastic sheathing, or an furring is used to attach cladding over foam sheathing, fur-
approved design. Where used, furring and furring attach- ring minimum fastening requirements to support the clad-
ments shall be designed to resist design loads determined in ding weight shall be as specified in Table 2603.13.2.
accordance with Chapter 16. In addition, the cladding or fur- Where placed horizontally, wood furring shall be preser-
ring attachments through foam sheathing to cold-formed steel vative-treated wood in accordance with Section 2303.1.9
framing shall meet or exceed the minimum fastening require-
or naturally durable wood and fasteners shall be corrosion
resistant in accordance with Section 2304.10.5.

2018 INTERNATIONAL BUILDING CODE ® 573
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