(1) Except as permitted in Sentence (3), foamed plastics that form part of a wall or ceiling assembly in combustible construction shall be protected from adjacent spaces in the building, other than adjacent concealed spaces within attic or roof spaces, crawl spaces, and wall and ceiling assemblies, by any of the following:
(a) one of the interior finishes described in Subsections 9.29.4. to 9.29.9.,
(b) provided the building does not contain a Group A, Group B or Group C major occupancy, sheet metal that,
(i) is mechanically fastened to the supporting assembly independent of the insulation,
(ii) is not less than 0.38 mm thick, and
(iii) has a melting point not less than 650°C, or
(c) any thermal barrier that meets the requirements of Sentence 3.1.5.12A.(2).
(2) The flame-spread rating on any exposed surface of combustible insulation, or any surface that would be exposed by cutting through it in any direction, shall be not more than 500.
(3) A walk-in cooler or freezer consisting of factory-assembled wall, floor or ceiling panels containing foamed plastics is permitted to be used in a building permitted to be of combustible construction, provided the panels,
(a) are protected on both sides by sheet metal not less than 0.38 mm thick having a melting point not less than 650°C,
(b) do not contain an air space, and
(c) when a sample panel with an assembled joint typical of field installation is subjected to the applicable test described in Subsection 3.1.12., have a flame-spread rating not more than that permitted for the space in which they are located, the space that they bound, or the walls of the building to which the cooler or freezer is attached, as applicable.
(4) The flame-spread rating of doors containing foamed plastics shall comply with Sentences 3.1.13.2.(1) to (3).
(1) Except as permitted in Sentence (3), foamed plastics that form part of a wall or ceiling assembly in combustible construction shall be protected from adjacent spaces in the building, other than adjacent concealed spaces within attic or roof spaces, crawl spaces, and wall and ceiling assemblies, by any of the following:
(a) one of the interior finishes described in Subsections 9.29.4. to 9.29.9.,
(b) provided the building does not contain a Group A, Group B or Group C major occupancy, sheet metal that,
(i) is mechanically fastened to the supporting assembly independent of the insulation,
(ii) is not less than 0.38 mm thick, and
(iii) has a melting point not less than 650°C, or
(c) any thermal barrier that meets the requirements of Sentence 3.1.5.12A.(2).
(2) The flame-spread rating on any exposed surface of combustible insulation, or any surface that would be exposed by cutting through it in any direction, shall be not more than 500.
(3) A walk-in cooler or freezer consisting of factory-assembled wall, floor or ceiling panels containing foamed plastics is permitted to be used in a building permitted to be of combustible construction, provided the panels,
(a) are protected on both sides by sheet metal not less than 0.38 mm thick having a melting point not less than 650°C,
(b) do not contain an air space, and
(c) when a sample panel with an assembled joint typical of field installation is subjected to the applicable test described in Subsection 3.1.12., have a flame-spread rating not more than that permitted for the space in which they are located, the space that they bound, or the walls of the building to which the cooler or freezer is attached, as applicable.
(4) The flame-spread rating of doors containing foamed plastics shall comply with Sentences 3.1.13.2.(1) to (3).
Article 3.1.4.2 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
Note: This protection must be provided by one of the following options:
- One of the interior finishes described in Subsections 9.29.4 to 9.29.9 (Plaster,
Gypsum Board with taped joints, Plywood, Hardboard, Fibreboard, Particleboard,
OSB, or Waferboard); - Sheet metal if, a) it is at least 0.38 mm thick and has a melting point of 650 ºC or
higher, b) it is mechanically fastened to the supporting assembly independent of the
insulation, c) the building does not contain a Group B (care, treatment or detention)
or Group C (residential) major occupancy; - Any thermal barrier material that meets the requirements of Sentence 3.1.5.15. (2).
