Page 86 - 2018_IRC

BUILDING PLANNING

R302.5.3 Other penetrations. Penetrations through the The interior finish shall comply with the following:
separation required in Section R302.6 shall be protected as 1. During the 40 kW exposure, flames shall not
required by Section R302.11, Item 4. spread to the ceiling.
R302.6 Dwelling-garage fire separation. The garage shall 2. The flame shall not spread to the outer extremity
be separated as required by Table R302.6. Openings in of the sample on any wall or ceiling.
garage walls shall comply with Section R302.5. Attachment
of gypsum board shall comply with Table R702.3.5. The wall 3. Flashover, as defined in NFPA 286, shall not
separation provisions of Table R302.6 shall not apply to occur.
garage walls that are perpendicular to the adjacent dwelling 4. The peak heat release rate throughout the test
unit wall. shall not exceed 800 kW.
R302.7 Under-stair protection. Enclosed space under stairs 5. The total smoke released throughout the test shall
that is accessed by a door or access panel shall have walls, not exceed 1,000 m .
2
under-stair surface and any soffits protected on the enclosed R302.10 Flame spread index and smoke-developed index
1
side with / -inch (12.7 mm) gypsum board. for insulation. Flame spread and smoke-developed index for
2
R302.8 Foam plastics. For requirements for foam plastics, insulation shall be in accordance with Sections R302.10.1
see Section R316. through R302.10.5.
R302.9 Flame spread index and smoke-developed index R302.10.1 Insulation. Insulating materials installed
for wall and ceiling finishes. Flame spread and smoke- within floor-ceiling assemblies, roof-ceiling assemblies,
developed indices for wall and ceiling finishes shall be in wall assemblies, crawl spaces and attics shall comply with
accordance with Sections R302.9.1 through R302.9.4. the requirements of this section. They shall exhibit a flame
R302.9.1 Flame spread index. Wall and ceiling finishes spread index not to exceed 25 and a smoke-developed
shall have a flame spread index of not greater than 200. index not to exceed 450 where tested in accordance with
ASTM E84 or UL 723. Insulating materials, where tested
Exception: Flame spread index requirements for fin- in accordance with the requirements of this section, shall
ishes shall not apply to trim defined as picture molds, include facings, where used, such as vapor retarders, vapor
chair rails, baseboards and handrails; to doors and win- permeable membranes and similar coverings.
dows or their frames; or to materials that are less than / 28
1
inch (0.91 mm) in thickness cemented to the surface of Exceptions:
walls or ceilings if these materials exhibit flame spread 1. Where such materials are installed in concealed
index values not greater than those of paper of this thick- spaces, the flame spread index and smoke-devel-
ness cemented to a noncombustible backing. oped index limitations do not apply to the fac-
R302.9.2 Smoke-developed index. Wall and ceiling fin- ings, provided that the facing is installed in
ishes shall have a smoke-developed index of not greater substantial contact with the unexposed surface of
than 450. the ceiling, floor or wall finish.
R302.9.3 Testing. Tests shall be made in accordance with 2. Cellulose fiber loose-fill insulation that is not
ASTM E84 or UL 723. spray applied and that complies with the require-
ments of Section R302.10.3 shall not be required
R302.9.4 Alternative test method. As an alternative to to meet the flame spread index requirements but
having a flame spread index of not greater than 200 and a shall be required to meet a smoke-developed
smoke-developed index of not greater than 450 where index of not more than 450 where tested in accor-
tested in accordance with ASTM E84 or UL 723, wall and dance with CAN/ULC S102.2.
ceiling finishes shall be permitted to be tested in accor-
dance with NFPA 286. Materials tested in accordance with 3. Foam plastic insulation shall comply with Sec-
NFPA 286 shall meet the following criteria: tion R316.

TABLE R302.6
DWELLING-GARAGE SEPARATION
SEPARATION MATERIAL
1
Not less than / -inch gypsum board or equivalent applied to the
From the residence and attics 2
garage side
5
From habitable rooms above the garage Not less than / -inch Type X gypsum board or equivalent
8
Structure(s) supporting floor/ceiling assemblies used for separation Not less than / -inch gypsum board or equivalent
1
required by this section 2
1
Not less than / -inch gypsum board or equivalent applied to the inte-
Garages located less than 3 feet from a dwelling unit on the same lot 2
rior side of exterior walls that are within this area
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
2018 INTERNATIONAL RESIDENTIAL CODE ® 61
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