14B-26-2603  Foam plastic insulation.
The provisions of Section 2603 of IBC are adopted by reference with the following modifications:
1.   In provisions adopted by reference, reset the following term in italic type: “foam plastic insulation.”
2.   Revise Section 2603.1 by replacing “foam plastic insulation” with “foam plastic insulation (including insulated panels with foam plastic insulation).”
3.   Revise exception 2 to Section 2603.3 to read:
“2.   In cold storage buildings, ice plants, food plants, food processing rooms and similar areas, foam plastic insulation where tested in a thickness of 4 inches (102 mm) shall be permitted in a thickness up to 10 inches (254 mm) where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1.”
4.   Revise exception 4 to Section 2603.3 by replacing “approved” with “approved.”
5.   Delete exception 5 to Section 2603.3.
6.   Revise Section 2603.4 by replacing “an approved” with “a.”
7.   Revise item 1 of Section 2603.4.1.5 to read:
“1.   The roof assembly is separated from the interior of the building by wood structural panel sheathing not less than 0.47 inch (11.9 mm) in thickness bonded with exterior glue, with edges supported by blocking, tongue-and-groove joints or other approved type of edge support or material.
8.   Delete Section 2603.4.1.6.
9.   Delete Section 2603.4.1.8.
10.   Revise the exception to Section 2603.4.1.9 to read:
Exception: Garage doors using foam plastic insulation complying with Section 2603.3 in detached and attached private garages associated with buildings of Group R-5 occupancy need not be provided with a thermal barrier.”
11.   Delete Section 2603.4.1.12.
12.   Revise Section 2603.4.1.14 by replacing “approved” with “approved.”
12.1.   Revise the third sentence of Section 2603.5 to read:
"Exterior walls of buildings of Type V construction shall comply with Sections 2603.2, 2603.3, 2603.4 and 2603.5.7."
13.   Revise Section 2603.7 to read:
2603.7 Foam plastic as interior finish or interior trim in plenum-served spaces.
Foam plastic used as interior wall or ceiling finish, or interior trim in plenum-served spaces, shall exhibit a flame spread index of 25 or less and a smoke-developed index of 50 or less when tested in accordance with ASTM E84 or UL 723 at the maximum thickness and density intended for use, and shall be tested in accordance with NFPA 286 and meet the acceptance criteria of Section 803.1.1. As an alternative to testing to NFPA 286, the foam plastic may be approved based on tests conducted in accordance with Section 2603.9.
Exceptions:
1.   Foam plastic used as interior wall or ceiling finish or interior trim in plenum-served spaces shall exhibit a flame spread index of 75 or less and a smoke-developed index of 450 or less when tested in accordance with ASTM E84 or UL 723 at the maximum thickness and density intended for use, where it is separated from the airflow in the plenum by a thermal barrier complying with Section 2603.4.
2.   Foam plastic used as interior wall or ceiling finish or interior trim in plenum-served spaces shall exhibit a flame spread index of 75 or less and a smoke-developed index of 450 or less when tested in accordance with ASTM E84 or UL 723 at the maximum thickness and density intended for use, where it is separated from the airflow in the plenum by corrosion-resistant steel having a base metal thickness of not less than 0.0160 inch (0.4 mm).
3.   Foam plastic used as interior wall or ceiling finish or interior trim in plenum-served spaces shall exhibit a flame spread index of 75 or less and a smoke-developed index of 450 or less when tested in accordance with ASTM E84 or UL 723 at the maximum thickness and density intended for use, where it is separated from the airflow in the plenum by not less than a 1-inch (25 mm) thickness of masonry or concrete.”
14.   Delete Section 2603.8 and Figure 2603.8.
15.   Revise Section 2603.9 by replacing “specifically approved” with “approved.”
16.   Revise Section 2603.11 by replacing “approved” with “engineered.”
17.   Revise exception 1 to Section 2603.11 by deleting “approved.”
Revise Section 2603.12 to read:
2603.12 Cladding attachment over foam sheathing to cold-formed steel framing.
Cladding shall be specified and installed in accordance with Chapter 14 and the cladding manufacturer’s installation instructions, including any limitations for use over foam plastic sheathing, or an engineered design. Where used, furring and furring attachments shall be designed to resist design loads determined in accordance with Chapter 16. In addition, the cladding or furring attachments through foam sheathing to cold-formed steel framing shall meet or exceed the minimum fastening requirements of Sections 2603.12.1 and 2603.12.2, or an engineered design for support of cladding weight.
Exceptions:
1.   Where the cladding manufacturer has provided installation instructions for application over foam sheathing, those requirements shall apply.
2.   For exterior insulation and finish systems, refer to Section 1407.
3.   For anchored masonry or stone veneer installed over foam sheathing, refer to Section 1404.”
18.   Revise note c to Table 2603.12.2 by replacing “approved” with “engineered.”
19.   Revise Section 2603.13 to read:
2603.13 Cladding attachment over foam sheathing to wood framing.
Cladding shall be specified and installed in accordance with Chapter 14 and the cladding manufacturer’s installation instructions. Where used, furring and furring attachments shall be designed to resist design loads determined in accordance with Chapter 16. In addition, the cladding or furring attachments through foam sheathing to framing shall meet or exceed the minimum fastening requirements of Section 2603.13.1 or 2603.13.2, or an engineered design for support of cladding weight.
Exceptions:
1.   Where the cladding manufacturer has provided installation instructions for application over foam sheathing, those requirements shall apply.
2.   For exterior insulation and finish systems, refer to Section 1407.
3.   For anchored masonry veneer or anchored stone veneer installed over foam sheathing, refer to Section 1404.”
20.   Revise note c to Table 2603.13.2 by replacing “approved” with “engineered.”
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 88)