| 3.1.7. |
Fire-Resistance Ratings |
| 3.1.7.1. |
Determination of Ratings
- Except as permitted by Sentence (2) and Articles 3.1.7.2. and 3.6.3.5., the rating of a material, assembly of materials or a structural member that is required to have a fire-resistance rating, shall be determined on the basis of the results of tests conducted in conformance with CAN/ULC-S101, "Fire Endurance Tests of Building Construction and Materials."
- A material, assembly of materials or a structural member is permitted to be assigned a fire-resistance rating on the basis of Appendix D.
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| 3.1.7.2. |
Exception for Exterior Walls
- The limit on the rise of temperature on the unexposed surface of an assembly as required by the tests referred to in Sentence 3.1.7.1.(1) shall not apply to an exterior wall that has a limiting distance of 1.2 m or more, provided correction is made for radiation from the unexposed surface in accordance with Sentence 3.2.3.1.(9).
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| 3.1.7.3. |
Exposure Conditions for Rating
- Floor, roof and ceiling assemblies shall be rated for exposure to fire on the underside.
- Firewalls and interior vertical fire separations shall be rated for exposure to fire on each side.
- Exterior walls shall be rated for exposure to fire from inside the building.
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| 3.1.7.4. |
Minimum Fire-Resistance Rating
- The use of materials or assemblies having a greater fire-resistance rating than required shall impose no obligation to exceed in whole or in part the minimum fire-resistance ratings required by this Part.
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| 3.1.7.5. |
Rating of Supporting Construction
- Except as permitted by Sentence (2) and by Articles 3.2.2.20. to 3.2.2.90. for mixed types of construction, all loadbearing walls, columns and arches in the storey immediately below a floor or roof assembly required to have a fire-resistance rating shall have a fire-resistance rating not less than that required for the supported floor or roof assembly.
- Loadbearing walls, columns and arches supporting a service room or service space need not conform to Sentence (1).
- Except for noncombustible roof assemblies required by Clauses 3.2.2.50.(2)(c) and 3.2.2.58.(2)(c), if an assembly is required to be of noncombustible construction and have a fire-resistance rating, it shall be supported by noncombustible construction.
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