The Ontario Building Code | Combustible Insulation and its Protection
3.1.5.12. Combustible insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation and its Protection
(1) Combustibleinsulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation, other than foamed plastics, is permitted in a buildingrequired to be of noncombustible constructionprovided that it has a flame-spread rating not more than 25 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction, where the insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation is not protected as described in Sentences (3) and (4).
(2) Foamed plastic insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation having a flame-spread rating not more than 25 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction, is permitted in a building required to be of noncombustible construction provided the insulation is protected from adjacent space in the building, other than adjacent concealed spaces within wall assemblies, by a thermal barrier consisting of,
(a) not less than 12.7 mm thick gypsum board mechanically fastened to a supporting assembly independent of the insulation,
(b) lath and plaster, mechanically fastened to a supporting assembly independent of the insulation,
(c) masonry,
(d) concrete, or
(e) any thermal barrier that meets the requirements of classification B when tested in conformance with CAN/ULC-S124, "Test for the Evaluation of Protective Coverings for Foamed Plastic".
(3) Combustibleinsulation having a flame-spread rating more than 25 but not more than 500 on an exposed surface, or any surface that would be exposed by cutting through the material in any direction, is permitted in the exterior walls of a building required to be of noncombustible construction, provided the insulation is protected from adjacent space in the building, other than adjacent concealed spaces within wall assemblies, by a thermal barrier as described in Sentence (2), except that in a buildingthat is not sprinklered and is more than 18 m high, measured between grade and the floor level of the top storey, or in a buildingthat is not sprinklered and is regulated by the provisions of Subsection 3.2.6., the insulation shall be protected by a thermal barrier consisting of,
(a) gypsum board not less than 12.7 mm thick, mechanically fastened to a supporting assembly independent of the insulation and with all joints either backed or taped and filled,
(b) lath and plaster, mechanically fastened to a supporting assembly independent of the insulation,
(c) masonry or concrete not less than 25 mm thick, or
(d) any thermal barrier that, when tested in conformance with CAN/ULC-S101, "Fire Endurance Tests of Building Construction and Materials", will not develop an average temperature rise more than 140°C or a maximum temperature rise more than 180°C at any point on its unexposed face within 10 min.
(4) Combustibleinsulation having a flame-spread rating more than 25 but not more than 500 on any exposed surface, or any surface that would be exposed by cutting through the material in any direction, is permitted in the interior walls, within ceilings and within roof assemblies of a building required to be of noncombustible construction, provided the insulation is protected from adjacent space in the building, other than adjacent concealed spaces within wall assemblies, by a thermal barrier as described in Sentence (2), except that in a building that is not sprinklered and is more than 18 m high, measured between grade and the floor level of the top storey, or in a building that is not sprinklered and is regulated by the provisions of Subsection 3.2.6., the insulation shall be protected by a thermal barrier consisting of,
(a) Type X gypsum board not less than 15.9 mm thick, mechanically fastened to a supporting assembly independent of the insulation and with all joints either backed or taped and filled, conforming to,
(i) ASTM C1396 / C1396M, "Gypsum Board", or
(ii) CAN/CSA-A82.27-M, "Gypsum Board",
(b) non-loadbearing masonry or concrete not less than 50 mm thick,
(c) loadbearingmasonry or concrete not less than 75 mm thick, or
(d) any thermal barrier that, when tested in conformance with CAN/ULC-S101, "Fire Endurance Tests of Building Construction and Materials",
(i) will not develop an average temperature rise more than 140°C or a maximum temperature rise more than 180°C at any point on its unexposed face within 20 min, and
(ii) will remain in place for not less than 40 min.
(5) Combustibleinsulation, including foamed plastics, installed above roof decks, outside of foundation walls below ground level and beneath concrete slabs-on-ground is permitted to be used in a buildingrequired to be of noncombustible construction.
(6) Thermosetting foamed plastic insulation having a flame-spread rating not more than 500 that forms part of a factory-assembled exterior wall panel that does not incorporate an air space is permitted to be used in a building required to be of noncombustible construction provided,
(a) the foamed plastic is protected on both sides by sheet steel not less than 0.38 mm thick that will remain in place for not less than 10 min when the wall panel is tested in conformance with CAN/ULC-S101, "Fire Endurance Tests of Building Construction and Materials",
(b) the flame-spread rating of the wall panel, determined by subjecting a sample including an assembled joint to the appropriate test described in Subsection 3.1.12., is not more than the flame-spread rating permitted for the room or space that it bounds,
(c) the buildingdoes not contain a Group B or Group C major occupancy, and
(d) the buildingis not more than 18 m high, measured between gradeand the floor level of the top storey.
(7) A factory-assembled non-loadbearing interior or exterior wall or ceiling panel containing foamed plastic insulation having aflame-spread rating of not more than 500 is permitted to be used in a building required to be of noncombustible construction provided,
(a) the buildingis sprinklered,
(b) the buildingis not more than 18 m high, measured between gradeand the floor level of the uppermost storey,
(c) the buildingdoes not contain a Group A, Group B or Group C major occupancy,
(d) the panel does not contain an air space,
(e) the panel, when tested in conformance with CAN/ULC-S138, "Test for Fire Growth of Insulated Building Panels in a Full-Scale Room Configuration", meets the criteria defined in the document, and
(f) the flame-spread rating of a panel, determined by subjecting a sample, including an assembled joint typical of field installation, to the appropriate test described in Subsection 3.1.12., is not more than the flame-spread rating permitted for the room or space that it bounds.