(1) Except as permitted in Sentence (2), factory-assembled wall and ceiling panels containing foamed plastic insulation with a flame-spread rating not more than 500 are permitted to be used in a building required to be of noncombustible construction, provided that,
(a) the building,
(i) is sprinklered,
(ii) is not more than 18 m high, measured from grade to the underside of the roof, and
(iii) does not contain a Group A, Group B or Group C major occupancy, and
(b) the panels,
(i) do not contain an air space,
(ii) when tested in accordance with CAN/ULC-S138, “Test for Fire Growth of Insulated Building Panels in a Full-Scale Room Configuration”, meet the criteria set out in that document, and
(iii) 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 room or space that they bound.
(2) Factory-assembled exterior wall panels containing thermosetting foamed plastic insulation are permitted to be used in a building required to be of noncombustible construction, provided that,
(a) the building,
(i) is not more than 18 m high, measured from grade to the underside of the roof, and
(ii) does not contain a Group B or Group C major occupancy, and
(b) the wall panels,
(i) do not contain an air space,
(ii) are protected on both sides by sheet steel not less than 0.38 mm thick,
(iii) remain in place for not less than 10 min when tested in accordance with CAN/ULC-S101, “Fire Endurance Tests of Building Construction and Materials”, where the exposed surface includes typical vertical and horizontal joints, and
(iv) 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 room or space that they bound.
(3) A walk-in cooler or freezer consisting of factory-assembled wall, floor or ceiling panels containing foamed plastic insulation with a flame-spread rating not more than 500 is permitted to be used in a building required to be of noncombustible construction, provided that,
(a) the building is sprinklered,
(b) the panels,
(i) are protected on both sides by sheet metal not less than 0.38 mm thick with a melting point not less than 650°C,
(ii) do not contain an air space,
(iii) when tested in accordance with CAN/ULC-S138, “Test for Fire Growth of Insulated Building Panels in a Full-Scale Room Configuration”, meet the criteria set out in that document, and
(iv) 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.