Section 2602

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SECTION 2602 - FOAM PLASTIC INSULATION

2602.1 General. The provisions of this section shall govern the requirements and uses of foam plastic insulation in buildings and structures. For trim, see Section 601.5.5.

2602.2 Labeling and Identification. Packages and containers of foam plastic insulation and foam plastic insulation components delivered to the jobsite shall bear the label of an approved agency showing the manufacturer's name, the product listing, product identification and information to show that the end use will comply with the code requirements.

2602.3 Surface-burning Characteristics. Foam plastic insulation used in building construction shall have a flame-spread rating of not more than 75 and a smoke-developed rating of not more than 450 when tested in accordance with U.B.C. Standard 8-1 in the maximum thickness intended for use.

EXCEPTION: Foam plastic insulation when tested in a minimum thickness of 4 inches (102 mm) may be used in a greater thickness in cold-storage buildings, ice plants, food-processing rooms and similar areas. For rooms within a building, the foam plastic insulation shall be protected by a thermal barrier on both sides having an index of 15.

2602.4 Thermal Barrier. The interior of the building shall be separated from the foam plastic insulation by an approved thermal barrier having an index of 15 when tested in accordance with U.B.C. Standard 26-2. The thermal barrier shall be installed in such a manner that it will remain in place for the time of its index classification based on approved diversified tests.

EXCEPTION: The thermal barrier is not required:

1. For siding backer board, provided the foam plastic insulation is not of more than 2,000 Btu per square foot (22.7 MJ/) as determined by U.B.C. Standard 26-1 and when it is separated from the interior of the building by not less than 2 inches (51 mm) of mineral fiber insulation or equivalent, or applied as re-siding over existing wall construction.

2. For walk-in coolers and freezer units having an aggregate floor area less than 400 square feet (37.2 ).

3. In a masonry or concrete wall, floor or roof system when the foam plastic insulation is covered by a minimum of 1-inch (25 mm) thickness of masonry or concrete. Loose-fill type foam plastic insulation shall be tested as board stock for flame spread and smoke development as described above.

4. Within an attic or crawl space where entry is made only for service of utilities, and when foam plastic insulation is covered with a material such as 1 1/2-inch-thick (38 mm) mineral fiber insulation, 1/4-inch-thick (6.4 mm) plywood, hardboard or gypsum wallboard, corrosion-resistant sheet metal having a base metal thickness not less than 0.0160 inch (0.4 mm) at any point, or other approved material installed in such a manner that the foam plastic insulation is not exposed.

5. In cooler and freezer walls when:

5.1 The foam plastic insulation has a flame-spread rating of 25 or less when tested in a minimum 4-inch (102 mm) thickness;

5.2 Has flash and self-ignition temperatures of not less than 600°F. and 800°F. (316°C. and 427°C.), respectively;

5.3 Is covered by not less than 0.032-inch (0.8 mm) aluminum or corrosion-resistant steel having a base metal thickness not less than 0.0160 inch (0.4 mm) at any point; and

5.4 Is protected by an automatic sprinkler system. When the cooler or freezer is within a building, both the cooler or freezer and that part of the building in which it is located shall be sprinklered.

2602.5 Special Provisions.

2602.5.1 General. Foam plastic insulation may be used in the following applications as set forth in this section:

2602.5.2 Noncombustible exterior walls.

2602.5.2.1 One-story buildings. Foam plastic insulation may be used in exterior walls of one-story buildings where exterior walls are required to be of noncombustible construction subject to the following:

1. The building is protected throughout with automatic sprinklers.

2. Foam plastic insulation tested in the maximum thickness and density intended for use, has a flame-spread rating of 25 or less and a smoke-developed rating of 450 or less in accordance with U.B.C. Standard 8-1.

3. The foam plastic insulation has a maximum 4-inch (102 mm) thickness.

4. The thermal barrier may be omitted when the foam plastic insulation is covered by not less than 0.032-inch-thick (0.8 mm) aluminum or corrosion-resistant sheet steel, having a base metal thickness of 0.0160 (0.4 mm) inch.

5. When the wall is required to have a fire-resistive rating, data based on tests conducted in accordance with U.B.C. Standard 7-1 are provided to substantiate that the required fire-resistive rating is maintained.

2602.5.2.2 Buildings of any height. Except for foam plastic insulation in masonry or concrete construction complying with Section 2602.4, Exception 3, assemblies employing foam plastic insulation in or on exterior walls of buildings where the exterior walls are required to be of noncombustible construction shall comply with the following:

1. When the wall is required to have a fire-resistive rating, data based on tests conducted in accordance with U.B.C. Standard 7-1, are provided to substantiate that the fire-resistive rating is maintained.

2. The foam plastic insulation is separated from the interior of the building by a thermal barrier having an index of 15 unless specifically approved under Section 2602.6.

3. Combustible content of foam plastic insulation in any portion of the wall or panel does not exceed 6,000 Btu per square foot (68.2 MJ/) of wall area as determined by tests in accordance with U.B.C. Standard 26-1.

4. Foam plastic insulation, exterior coatings and facings tested separately, shall each have a flame-spread rating of 25 or less and a smoke-developed rating of 450 or less in accordance with U.B.C. Standard 8-1. The foam plastic shall be tested in the thickness intended for use.

5. The wall assembly is tested in accordance with U.B.C. Standard 26-4 and complies with the conditions of acceptance contained therein.

6. Foam plastic insulation is listed and the edge or face of each piece is labeled with the following information:

6.1 Inspection agency name.

6.2 Product for which the insulation is listed.

6.3 Identification of the insulation manufacturer.

6.4 Flame-spread and smoke-development classifications.

2602.5.3 Roofing. Foam plastic insulation meeting the requirements of Sections 2602.2, 2602.3 and 2602.4 may be used as part of a roof-covering assembly, provided the assembly with the foam plastic insulation is a Class A, B or C roof covering when tested in accordance with U.B.C. Standard 15-2. Foam plastic insulation which is a part of a Class A, B or C roof-covering assembly need not meet the requirements of Sections 2602.2, 2602.3 and 2602.4, provided the assembly with the foam plastic insulation satisfactorily passes a test for insulated roof decks.

Any roof covering installed in accordance with this code and the manufacturer's instructions may be applied over foam plastic insulation when the foam is separated from the interior of the building by plywood sheathing not less than 1/2 inch (12.7 mm) in thickness bonded with exterior glue, with edges supported by blocking, tongue-and-groove joints or other approved type of edge support, or an equivalent material. The thermal barrier requirement is waived.

For all roof applications, the smoke-developed rating shall not be limited.

2602.5.4 Doors. Where doors are permitted without a fire-resistive rating, foam plastic insulation having a flame-spread rating of 75 or less may be used as a core material when the door facing is metal having a minimum thickness of 0.032-inch (0.8 mm) aluminum or steel having a base metal thickness not less than 0.0160 inch (0.4 mm) at any point. The thermal barrier is not required for this condition.

2602.6 Specific Approval. Foam plastic insulation or assemblies using foam plastic insulation may be used based on approved tests such as, but not limited to, tunnel tests in accordance with U.B.C. Standard 8-1, fire tests related to actual end use such as U.B.C. Standard 26-3 and an ignition temperature test establishing a minimum self-ignition temperature of 650°F. (343°C.) In lieu of testing, the specific approval may be based on the end use, quantity, location and similar considerations where such tests would not be applicable or practical.

Foam plastic insulation in a thickness greater than 4 inches (102 mm) may be used if it has been tested for flame spread and smoke development at a minimum thickness of 4 inches (102 mm) provided the end use has been specifically approved in accordance with this subsection with the thickness and density intended for use.