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PLASTIC

4. Metal-faced panels having minimum 0.019-inch- 2. Foam plastic in plenums used as interior wall or
thick (0.48 mm) aluminum or 0.016-inch-thick ceiling finish, or interior trim, shall exhibit a flame
(0.41 mm) corrosion-resistant steel outer facings. spread index of 75 or less and a smoke-developed
5. A minimum / -inch (22.2 mm) thickness of index of 450 or less when tested in accordance with
7
8
stucco complying with Section 2510. ASTM E84 or UL 723 at the maximum thickness
1
6. A minimum / -inch (6.4 mm) thickness of fiber- and density intended for use, where it is separated
4
cement lap, panel or shingle siding complying with from the airflow in the plenum by corrosion-resis-
Section 1404.16 and Section 1404.16.1 or tant steel having a base metal thickness of not less
1404.16.2. than 0.0160 inch (0.4 mm).
2603.6 Roofing. Foam plastic insulation meeting the require- 3. Foam plastic in plenums used as interior wall or
ments of Sections 2603.2, 2603.3 and 2603.4 shall be permit- ceiling finish, or interior trim, shall exhibit a flame
ted as part of a roof-covering assembly, provided that the spread index of 75 or less and a smoke-developed
assembly with the foam plastic insulation is a Class A, B or C index of 450 or less when tested in accordance with
roofing assembly where tested in accordance with ASTM ASTM E84 or UL 723 at the maximum thickness
E108 or UL 790. and density intended for use, where it is separated
from the airflow in the plenum by not less than a 1-
2603.7 Foam plastic in plenums as interior finish or inte- inch (25 mm) thickness of masonry or concrete.
rior trim. Foam plastic in plenums used as interior wall or
ceiling finish, or interior trim, shall exhibit a flame spread 2603.8 Protection against termites. In areas where the prob-
index of 25 or less and a smoke-developed index of 50 or less ability of termite infestation is very heavy in accordance with
when tested in accordance with ASTM E84 or UL 723 at the Figure 2603.8, extruded and expanded polystyrene, polyiso-
maximum thickness and density intended for use, and shall be cyanurate and other foam plastics shall not be installed on the
tested in accordance with NFPA 286 and meet the acceptance exterior face or under interior or exterior foundation walls or
criteria of Section 803.1.1. As an alternative to testing to slab foundations located below grade. The clearance between
NFPA 286, the foam plastic shall be approved based on tests foam plastics installed above grade and exposed earth shall
conducted in accordance with Section 2603.9. be not less than 6 inches (152 mm).
Exceptions:
Exceptions:
1. Foam plastic in plenums used as interior wall or 1. Buildings where the structural members of walls,
ceiling finish, or interior trim, shall exhibit a flame floors, ceilings and roofs are entirely of noncombus-
spread index of 75 or less and a smoke-developed tible materials or preservative-treated wood.
index of 450 or less when tested in accordance with 2. An approved method of protecting the foam plastic
ASTM E84 or UL 723 at the maximum thickness and structure from subterranean termite damage is
and density intended for use, where it is separated provided.
from the airflow in the plenum by a thermal barrier 3. On the interior side of basement walls.
complying with Section 2603.4.

FIGURE 2603.8
TERMITE INFESTATION PROBABILITY MAP

572 2018 INTERNATIONAL BUILDING CODE ®
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