9.10.17. Flame-Spread Limits

9.10.17. Flame-Spread Limits
9.10.17.1. Flame-Spread Rating of Interior Surfaces
  1. Except as otherwise provided in this Subsection, the exposed surface of every interior wall and ceiling, including skylights and glazing, shall have a surface flame-spread rating of not more than 150.
  2. Except as permitted in Sentence (3), doors need not conform to Sentence (1) provided they have a surface flame-spread rating of not more than 200.
  3. Doors within dwelling units, other than garage doors, need not conform to Sentences (1) and (2).
9.10.17.2. Ceilings in Exits or Public Corridors
  1. At least 90% of the exposed surface of every ceiling in an exit or unsprinklered ceiling in a public corridor shall have a surface flame-spread rating of not more than 25. (See Article 9.10.17.6.)
9.10.17.3. Walls in Exits
  1. Except as provided in Sentence (2), at least 90% of the exposed surfaces of every wall in an exit shall have a surface flame-spread rating of not more than 25. (See Article 9.10.17.6.)
  2. At least 75% of the wall surface of a lobby used as an exit in Article 9.9.8.5. shall have a surface flame-spread rating of not more than 25. (See Article 9.10.17.6.)
9.10.17.4. Exterior Exit Passageways
  1. Where an exterior exit passageway provides the only means of egress from the rooms or suites it serves, the wall and ceiling finishes of that passageway, including the soffit beneath and the guard on the passageway, shall have a surface flame-spread rating of not more than 25, except that up to 10% of the total wall area and 10% of the total ceiling area is permitted to have a surface flame-spread rating of not more than 150.
9.10.17.5. Walls in Public Corridors
  1. At least 90% of the total wall surface in any unsprinklered public corridor shall have a surface flame-spread rating of not more than 75, or at least 90% of the upper half of such walls shall have a surface flame-spread rating of not more than 25. (See Article 9.10.17.6.)
9.10.17.6. Calculation of Wall and Ceiling Areas
  1. Skylights, glazing, combustible doors, and combustible light diffusers and lenses shall not be considered in the calculation of wall and ceiling areas in this Subsection.
9.10.17.7. Corridors Containing an Occupancy
  1. Where a public corridor or a corridor used by the public contains an occupancy, the interior finish materials used on the walls or ceiling of such occupancy, shall have a surface flame-spread rating in conformance with that required for public corridors.
9.10.17.8. Light Diffusers and Lenses
  1. Light diffusers and lenses having flame-spread ratings that exceed those permitted for the ceiling finish, shall conform to the requirements of Sentence 3.1.13.4.(1).
9.10.17.9. Combustible Skylights
  1. Individual combustible skylights in corridors required to be separated from the remainder of the building by fire separations shall not exceed 1 m2 in area and shall be spaced not less than 1.2 m apart.
9.10.17.10. Protection of Foamed Plastics
(See Note A-3.1.4.2.)
  1. Except as provided in Sentences (2) and (3), foamed plastics that form part of a wall or ceiling assembly shall be protected from adjacent space in the building, other than adjacent concealed spaces within attic or roof spaces, crawl spaces, wall assemblies and ceiling assemblies
    1. by one of the interior finishes described in Subsections 9.29.4. to 9.29.9.,
    2. provided the building does not contain a Group C major occupancy, by sheet metal that
      1. is mechanically fastened to the supporting assembly independent of the insulation,
      2. is not less than 0.38 mm thick, and
      3. has a melting point not less than 650°C, or
    3. by any thermal barrier that meets the requirements of Sentence 3.1.5.15.(2). (See Note A-3.1.4.2.(1)(c).)
  2. A walk-in cooler or freezer consisting of factory-assembled wall, floor or ceiling panels containing foamed plastics is permitted to be used, provided the panels
    1. are protected on both sides by sheet metal not less than 0.38 mm thick having a melting point not less than 650°C,
    2. do not contain an air space, and
    3. have a flame-spread rating, determined by subjecting a sample panel with an assembled joint typical of field installation to the applicable test described in Subsection 3.1.12., that is not more than that permitted for the room or space in which they are located or that they bound.
  3. Thermosetting foamed plastic insulation having a flame-spread rating of not more than 200 is permitted to be used in factory-assembled doors in storage garages serving single dwelling units provided that
    1. the insulation is covered on the interior with a metallic foil,
    2. the assembly has a flame-spread rating of not more than 200, and
    3. the assembly incorporates no air spaces.
9.10.17.11. Walls and Ceilings in Bathrooms
  1. The interior finish of walls and ceilings in bathrooms within suites of residential occupancy shall have a surface flame-spread rating of not more than 200.
9.10.17.12. Coverings or Linings of Ducts
  1. Where a covering or a lining is used with a duct, such lining or covering shall have a flame-spread rating conforming to Article 3.6.5.4. or 9.33.6.4.

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