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• • • BUILDING PLANNING a smoke alarm installed on the upper level shall suffice for the adjacent lower level provided that the lower level is less than one full story below the upper level. When more than one smoke alarm is required to be installed within an individual dwelling unit the alarm devices shall be in- terconnected in such a manner that the actuation of one alarm will activate all of the alarms in the individual unit. The alarm shall be clearly audible in all bedrooms over background noise levels with all intervening doors closed. All smoke alarms shall be listed and installed in accordance with the provisions of this code and the household fire warning equipment provisions of NFPA 72. [EB] R313.1.1 Alterations, repairs and additions. When interior alterations, repairs or additions requiring a permit occur, or when one or more sleeping rooms are added or cre- ated in existing dwellings, the individual dwelling unit shall be provided with smoke alarms located as required for new dwellings; the smoke alarms shall be interconnected and hard wired. Exceptions: 1. Smoke alarms in existing areas shall not be fe- quired to be interconnected and hard wired where the alterations or repairs do not result in the re- moval of interior wall or ceiling finishes exposing the structure, unless there is an attic, crawl space, or basement available which could provide access for hard wiring and interconnection without the re- moval of interior finishes. 2. Repairs to the exterior surfaces of dwellings are exempt from the requirements of this section. [F] R313.2 Power source. In new construction, the required smoke alarms shall receive their primary power from the build- ing wiring when such wiring is served from a commercial source, and when primary power is interrupted, shall receive power from a battery. Wiring shall be permanent and without a disconnecting switch other than those required for overcurrent protection. Smoke alarms shall be permitted to be battery oper- ated when installed in buildings without commercial power or in buildings that undergo alterations, repairs or additions regu- lated by Section R313.1.1. SECTION R314 FOAM PLASTIC R314.1 General. The provisions of this section shall govern the requirements and uses of foam plastic insulation. R314.1.1 Surface burning characteristics. Except where otherwise noted in Section R314.2, all foam plastic or foam plastic cores in manufactured assemblies used in building construction shall have a flame -spread rating of not more than 75 and shall have a smoke -developed rating of not more than 450 when tested in the maximum thickness intended for use in accordance with ASTM E 84. R314.1.2 Thermal barrier. Foam plastic, except where otherwise noted, shall be separated from the interior of a building by minimum'/2-inch (12.7 mm) gypsum board or an approved finish material equivalent to a thermal barrier to 52 limit the average temperature rise of the unexposed surface to no more than 250°F (121°C) after 15 minutes of fire exposure to the ASTM E 119 standard time temperature curve. The gypsum board shall be installed using a mechani- cal fastening system in accordance with Section R702.3.5. Reliance on adhesives to ensure that the gypsum board will remain in place when exposed to fire shall be prohibited. 8314.2 Specific requirements. The following requirements shall apply to all uses of foam plastic unless specifically ap- proved in accordance with Section. R314.3 or by other sections of the code. R314.2.1 Masonry or concrete construction. Foam plas- tics may be used without the thermal barrier described in Section R314.1 when the foam plastic is protected by a minimum 1 -inch (25.4 mm) thickness of masonry or con- crete. j R314.2.2 Roofing. Foam plastic may be used in a roof -covering assembly without the thermal barrier when the foam is separated from the interior of the building by wood structural panel sheathing in accordance with Section R803, not less than 15/32 inch (11.9 mm) in thickness bonded with exterior glue and identified as Exposure 1, with edge supported by blocking or tongue -and -groove joints. The smoke -developed rating shall not be limited. R314.2.3 Attics and crawlspaces. Within attics and crawlspaces where entry is made only for service of utilities, foam plastics shall be protected against ignition by 11/2 -inch -thick (38 mm) mineral fiber insulation, '/4 -inch - thick (6.4 mm) wood structural panels, 3/8 -inch (9.5 mm) particleboard, 1/4 -inch (6.4 mm) hardboard, 3/8 -inch (9.5 mm) gypsum board, or corrosion -resistant steel having a base metal thick-ness of 0.016 inch (0.406 mm). R314.2A Foam -filled doors. Foam -filled doors are exempt from the requirements of Section R314.1. R314.25 Siding backer board. Foam plastic board of not more than'/2-inch (12.7 mm) thickness may be used as sid- ing backer board when separated from interior spaces by not less than 2 inches (51 mm) of mineral fiber insulation or 1/2 -inch (12.7 mm) gypsum wallboard or installed over ex- isting exterior wall finish in conjunction with re -siding, pro- viding the plastic board does not have a potential heat of more than 2,000 Btu per square foot (22 720 kJ/m2) when tested in accordance with NFPA 259. R314.2.6 Interior trim. Foam plastic trim defined as pic- ture molds, chair rails, baseboards, handrails, ceiling beams, door trim and window trim may be installed, provided: 1. The minimum density is 20 pounds per cubic foot (3.14 kg/m3). 2. The maximum thickness of the trim is 0.5 inch (12.7 mm) and the maximum width is 4 inches (102 mm). 3. The trim constitutes no more than 10 percent of the area of any wall or ceiling. 4. The flame -spread rating does not exceed 75 when tested per ASTM E 84. The smoke -developed rating is not limited. 2003 INTERNATIONAL RESIDENTIAL CODE®